KA 44B Maintenance

MAINTENANCE/0VERHAIJLMANIJAL

KA44/448ADFANTENNA

KTS156ANTENNATESTSET

MANUAL NUMBER 006-5635-03

REVISION 3

1st PRINTING JUNE, 1981

KING RADIO CORPORATIONo400 NORTH ROGERS ROAD OLATHE, KANSAS, U.S.A.

Manufactured By

KIN GPRINT1NG DivlSION

MAINTENANCE/0VERHAULMANUAL

KA44ADFANTENNA

KING RADIO CORPORATION,400 NORTH ROGERS ROAD OLATHE, KANSAS, U.S.A.

KINGKA 44

ADF ANTENNA

TABLEOFCONTENTSSECTIONIV

THEORYOFOPEFLATIONParagraph Page

4.1 GeneraL 4-1

4.2 General circuit Theory 4-1

4.3 KA 44 DetaiLed circuit Theory 4-3

SECTIONYMAINTENANCE

Paragraph Page

5.1 GeneraL Information 5-1

5.2 Test and ALignment 5-15.2.1 Generat Information 5-15.2.2 Test Equipment Required 5-15.2.3 Test And ALignment Procedure 5-1

5.3 Overhaut 5-35.3.1 Inspection 5-35.3.2 CLeaning 5-45.3.3 Repair 5-45.3.4 KA 44 DisassembLy 5-45.3.5 KA 44 ReassembLy 5-5

5.4 TroubLeshooting 5-55.4.1 Sense And Loop Antenna check 5-95.4.2 Sense Circuit 5-95.4.3 Loop Circuits 5-10

SECTIONVIILLUSTRATEDPARTSLIST

Item Page

1 ADF Antenna AssembLy 6-12 Antenna AmpLifier ModuLe 6-133 AmpLifier/ModuLator #1 Board (SN 4250 and Above) 6-174 Amplifier/Modulator #1 Board (SN 4249 and BeLow) 6-235 AmpLifier/ModuLator #2 Board (SN 4250 and Above) 6-296 AmpLifier/ModuLator #2 Board (SN 4249 and BeLow) 6-35

LISTOFILLUSTRIEilONS

Figure Page

4-1 KA 44 Antenna System BLock Diagram 4-2

5-1 KA 44 Antenna TroubLeshooting FLowchart 5-75-2 Switched Phase Loop SignaL 5-105-3 Phase ModuLated Output SignaL 5-11

Rev. 3, June 1981MMOO18-3

KINGKA 44

ADF ANTENNA

LISTOFILLUSTRATIONSFigure Page

6-1 KA 44 Antenna Assembly 6-56-2 Antenna Amptifier Modute 6-156-3 Amplifier Board #1 Assembly and Schematic (SN 4250 and Above) 6-216-4 AmpLifier Board #1 Assembly and Schematic (SN 4249 and Below) 6-276-5 AmpLifier Board #2 AssembLy and Schematic (SN 4250 and Above) 6-336-6 AmpLifier Board #2 Assembly and Schematic (SN 4250 and BeLow) 6-39


KINGKA 44

ADF ANTENNA

SECTIONIVTHEORYOFOPERATION

4.1 GENERALThe KA 44 antenna is an integraL part of some King Radio ADF systems. It contains both the Loop andsense antennas as weLL as an electronics package containing active circuitry. The circuitry ampLifiesthe antenna signals, then phase modulates them into a form that is readiLy demodulated into bearinginformation by the receiver. The antenna output is buffered in order to atLow a non-criticaL Length RFcabLe to be used between the antenna and the receiver.

For a compLete discussion of basic ADF principles, see Section 4.1 of the appropriateMaintenance/Overhaut Manual.

4.2 GENERALCIRCUITTHEORY(Refer to the KA 44 System BLock Diagram, Figure 4-1, for the foLLowing discussion.)

Both the Loop and sense antennas that an ADF system require are contained in the KA 44 antenna. The Loopantenna consists of perpendicular windings around a block of ferrite core materiaL which serves toincrease the magnetic flux density through the windings. The Loop signals are ampLified by separate FETdifferential amplifiers and applied to the inputs of a pair of baLanced modulators. The carrier inputsto the moduLators are two 32Hz sguare waves supgtied from the receiver. The modulating signaL to thesine channet Lags the other by 90 (Leads by 90 for a top mounted antenna). The moduLating signalssimply reverse the phase of the Loop RF signaLs at a 32Hz rate. Output signals from the moduLators aresummed with the ampLified and phase compensated sense signaL. The sense signat must be 90 out of phasewith the Loop signaLs at the summing point, so phase compensation is necessary to maintain the 90 phasedifference over frequency. This quadrature summing operation effectiveLy produces a phase moduLation ofthe sense signaL, which is further ampLified before being supplied to the receiver.


Page 4-1

KING

KA 44ADF ANTENNA

SINE LOOP

BALANCED

AMP MODULATOR

CLOSlpNEMAOLDAUACEDR

RFHAOSEMODULATED

32HzLiBO -pINPUT

32HzLO* g.INPUT

LOOP ENABLE yINPUT

SENSENTENNA

PHASE

AMP COMPENSATION

FIGURE 4-1 KA 44 ANTENNASYSTEM BLOCK DIAGRAM(Dwg. No. 696-3269-00, R-0)

MMOO17-10 Page 4-2

KINGKA 44

ADF ANTENNA

4.3 DETAILEDCIRCUITTHEORYAntenna AmpLifier/Modulator circuitry

The two Loop ampLifier channets are identicat. Each channet consists of a pair of n-channet JFETtransistors in a cLass A differentiaL ampLifier configuration. The 1 megohm gate resistors provide a DCpath to ground for the minute gate bias currents. Resistors R107 and R123 vary the drain bias currentsof the ampLifieres, thereby adjusting the gain and input impedance. The ampLifiers Load the antenna Loopwindings considerabLy in order to de-Q them and aLLow a fLatter Loop frequency response. The LoopampLifiers develop signats across transformers T101 and T102 which are coupted through voLtage dividersto the signaL inputs of baLanced moduLators I101 and I102. A pair of 32Hz square waves that are 90apart in phase are used as the carrier inputs to the moduLators. They produce reLativeLy high LevetvoLtages across resistors R208 and R214 at the carrier inputs, causing the RF input signats to appear atthe output terminaLs reversing phase at a 32Hz rate. Some AC gain is provided by the moduLators -potentiometers R116 and R202 externaLLy vary the emitter resistance of an ampLifier stage within themoduLator, thereby aLLowing adjustabLe gain. R202 is externaLLy accessible through a hoLe in the capcasting of the antenna to compensate for unequaL signaL pickup by the sine and cosine Loops due toasymmetric fieLd fringing by the airframe. The moduLators are onLy turned on when the receiver is in theADF mode and is Locked onto a vaLid station, otherwise, a low signaL on the Loop enabLe Line from thereceiver shuts off bias currents into pin 5 of the moduLators, effectiveLy shutting off the moduLators.The moduLators are enabLed when the Low signat is removed from the Line, thereby aLLowing bias current tofLow through R213, R212, CR201 and R211. The Loop signats are then buffered by 0105 before being summedwith the sense signaL.

The sense signat is ampLified by a JFET cascode stage, 0202 and Q203, which presents a high inputimpedance to the sense antenna. The output of 9202 and 0203 drives a phase compensation networkcomprised of T201 and C201. This network is needed in order to maintain a constant 90 phase between theLoop and the sense signaLs since the reLative phase of the Loop signaL changes over frequency. At theoutput of this network, the sense signaL is summed with the Loop outputs, which are 90 out of phase withthe sense signaL. This quadrature summing produces the phase moduLation of the Larger ampLitude sense"carrier". An emitter fottower stage buffers the resuLting RF signaL and drives transformer T202, whichimpedance matches the signaL to the 50 ohm input impedance of the receiver. A high-pass fiLter networkconsisting of C215, C216 and L206 attenuates unwanted Low frequency signaLs to improve the spuriousresponse of the system.

Rev. 3, June 1981MMOO17-10 Page 4-3

KINGKA 44

ADF ANTENNA

SECTIONYMAINTENANCE

5.1 GENERALINFORMATIONThis section contains test, aLignment, cLeaning, repair and troubLeshooting procedures for the KA 44 ADFAntenna. IncLuded are detaiLed assembLy/disassembLy instructions, and troubLeshooting instructions.

Information concerning semiconductor test equipment, semiconductor and integrated circuit maintenance andspecific integrated circuits used in the KA 44 Antenna may be found in Appendix A at the end of thismanuaL. It is suggested that Appendix A be consuLted before attempting to service the KA 44.

5.2 TESTANDAI.IGNMENT5.2.1 GENERAL INFORMATION

The foLLowing test procedure may be foLLowed to determine whether or not the KA 44 is operating properLy.If it is not, alignment procedures are detaiLed in order to bring the KA 44 up to its minimum performancestandards.

The King KTS 156 Antenna SimuLator is used in order to simuLate sense and Loop signaLs of the properphase and ampLitude reLationship. The simuLator aLso contains an internaL cLock that can suppLy the 32HzmoduLation signaLs, enabLing the KA 44 to be tested and aLigned with or without the ADF receiver. Referto the maintenance/overhaut section of the KTS-156 for a detaiLed expLanation of its operation.

5.2.2 TEST EQUIPMENT REQUIRED

A. Power SuppLy +13.75VDC e 1.0 amp or +27.5VDC 8 .5 amp(+9.0VDC e .5 amp if KTS-156 onLy is used)

B. OsciLLoscope - Tektronix 465 or equivatent

C. RF SignaL Generator - 200KHz - 1800KHz - HP 606A/B or equivaLent

D. DigitaL VoLtmeter - FLuke 8600A or equivatent

E. Frequency Counter - Monsanto 100A or equivaLent

F. AC VTVM - BaLLantine 310 or equivaLent

G. King KTS 156 Antenna SimuLator

5.2.3 TEST AND ALIGNMENTPROCEDURE

Make the foLLowing tests and any adjustments as necessary to reaLign the antenna.

A. Remove the eLectronics assembLy from the antenna and connect it to the KTS 156. Connect theRF generator to the RF input jack of the KTS 156 and power the unit with + 14VDC. PLug thepigtait connector into the connector on the antenna eLectronics unit.

B. The KTS 156 switches shouLd be in the foLLowing positions:

LOOP Switch - ENSENSE Switch - DISMODE Switch - CALMODE Function Switch - CatibrateLOAD - 50 ohmBRG SeLector - OSW SOURCE - SimuLator (NOTE: If the ADF receiver is aLso being tested and

aligned, connect the ADF to the KTS 156 and switch theswitching source to RCVR).


Page 5-1

KINGKA 44

ADF ANTENNA

C. AppLy a 550KHz |_ 100Hz unmoduLated input signaL from the RF generator to the KTS 156.

D. Connect the VTVM to the LOOP INPUT MONITOR jack and adjust the Levet of the RF generator togive a 5mV _0.2mv reading on the VTVM. (Approx. 0.1V RMS Loaded).

E. Turn the MODE Function Switch to COS and adjust R123 to match the 5mv_

0.2mV reading ofstep 4, 0.2mV. Resecure the pot to keep it in pLace.

F. Now turn the MODE Function Switch to SIN, turn the BRG seLector to 90, and adjust R107 tomatch the reading in step 4, j 0.2mV. Resecure this pot aLso.

G. Now pLace these switches in the foLLowing positions:

LOOP switch - DISSENSE Switch - ENMODE Switch - BRGMODE Function Switch - BRG

H. Monitor the 50 ohm OUTPUT monitor jack with the VTVM.

I. Increase the Levet of the 550KHz input signaL to 0.6VRMS 0.03V at the RF generator output.Be sure to measure the generator output with a 50 ohm Load or white connected to the KTS156.

J. Make the foLLowing adjustments:

1. Adjust R134 for a 42mV 2mV RMS reading on the VTVM. Secure R134 in pLace to preventit from vibrating out of adjustment. (Using P.C. Boards with S/N 4249 and beLow withoutKA 44-2).

2. Check for a 27mV 7mV RMS reading on the VTVM. (Using P.C. Boards with S/N 4249 andbeLow with KA 44-2).

3. Check for a 42mV_

13mv RMS reading on the VTVM. (Using P.C. Boards S/N 4250 and above)

K. Now change the input frequency to 200KHz $_ 100Hz white maintaining the generator outputLevet of 0.6VRMS.

L. Note the output voLtage at the 50 ohm output monitor jack.

RF output voltage (200KRz) = mV.

M. At this point, it may be desirable to introduce some quadrantaL error (0.E.) compensationinto the antenna in order to simplify the compensation procedure once the unit has beenreinstaLLed into the aircraft. It has been found that 6 of 0.E. is average on most Lightaircraft. If it is desired to pre-compensate for G.E., take the voLtage measured in step Land divide it by (See Table BeLow). This is the desired sine Loop voLtage. Note it beLow.If it is not desired to introduce 0.E. Compensation, divide the voLtage of step L by (SeeTabLe BeLow) to get the desired sine Loop vottage. The desired cosine Loop voLtage isaLways equaL to the voLtage of step L divided by ( ee TabLe BeLokO . ALL KTS 156 benchampLifier moduLes, KPN 200-2748-01, are aLigned with 0 0.E. Compensation.

KA 44 SENSE/LOOP RATIODIVISION FACTORS

Using KTS 156:Without Service | With ServiceLetter KTS 156-1| Letter KTS 156-1

SIN GE=0 4.75 4.07SIN GE=6 3.90 3.15COS 4.75 4.07

Desired sin.e Loop vottage: mVRMSDesired cosine Loop voLtage: mVRMS -


Page 5-2

KINGKA 44

ADF ANTENNA

N. Now place these switches in the foLLowing positions:

Loop Switch - EnabLeSense Switch - DisabLeBearing SeLector - 90

S/N 4249 and Betow (with and without KA 44-2) or With EarLy StyLe Boards: KPN 200-6198-DO and200-6243-00

0. Adjust R116 to the desired sine Loop voLtage noted above + 0.2mv. Once again this voLtageis measured with the VTVM at the 50 ohm output monitor jack. Secure this pot in place.

P. Turn the bearing seLector to 0 and adjust R202 through the hoLe in the cap casting to thedesired cosine Loop voltage

_

0.2mV.

S/N 4250 and Above or With Late StyLe Boards, KPN 200-6389-00 and 200-6390-00

0. Adjust R202 through the hoLe in the cap casting to the desired sine Loop voLtage noted above+ 0.2mV. Once again the voLtage is measured with the VTVM at the 50 ohm OUTPUT monitorjack.

P. Turn the BRG seLector to 0 and adjust R116 to the desired cosine Loop voLtage_

0.2mV.

5.3 OVERHAUL5.3.1 INSPECTION

This section contains instructions to assist in determining, by inspection, the condition of the ADF andKA 44 assembLies. Defects resuLting from wear, physicaL damage, deterioration, or other causes can befound by these inspection procedures. To aid inspection, detaiLed procedures are arranged inaLphabeticaL order.

A. Capacitors, Fixed

Inspect capacitors for case damage, body damage, and cracked, broken, or charred insuLation.Check for Loose, broken, or corroded terminaL studs, Lugs, or Leads. Inspect for Loose,broken, or improperty soLdered connections.

B. Connectors

Inspect connectors for broken parts, deformed sheLLs or cLamps, and other irreguLarities.Inspect for cracked or broken insuLation and for contacts that are broken, deformed, or outof aLignment. ALso, check for corroded or damaged pLating on contacts and for Loose,improperty soLdered, broken, or corroded terminaL connections.

C. Covers and ShieLds

Inspect covers and shieLds for punctures, deep dents, and badLy worn surfaces. ALso, checkfor corrosion and damage to finish.

D. InsuLators

Inspect insuLators for evidence of damage, such as broken or chipped edges, burned areas,and presence of foreign matter.

E. Potentiometers

Inspect aLL potentiometers for evidence of damage such as dents, cracked insuLation, orother irreguLarities.

F. Resistors, Fixed

Inspect the fixed resistors for cracked, broken, blistered, or charred bodies and Loose,broken, or improperLy soLdered or corroded terminaL connections.


Page 5-3

KINGKA 44

ADF ANTENNA

G. RF Coits

Inspect aLL RF coiLs for broken Leads, Loose mountings, and Loose, improperty soldered, orbroken terminaL connections. Check for crushed, scratched, cut or charred windings.Inspect the windings, Leads, terminals and connections for corrosion or physical damage.Check for physical damage to forms and tuning stug adjustment screws.

H. Transformers

1. Inspect for signs of excessive heating, physicaL damage to case, cracked or brokeninsulation, and other abnormal conditions.

2. Inspect for corroded, poorty soLdered, or Loose connecting wires.

I. Wiring

Inspect wiring for breaks in insuLation, conductor breaks, and improper dress in relation toadjacent wiring or chassis.

5.3.2 CLEANING

A. Using a cLean, Lint-free cLoth LightLy moistened with a regular cleaning detergent, removethe foreign matter from the equipment case and unit front paneLs. Wipe dry using a cLean,dry, Lint-free cLoth.

B. Using a hand controLLed dry air jet (not more than 15psi), bLow dust from inaccessibLeareas. Care shouLd be taken to prevent damage by the air bLast.

C. CLean the receptacLes and plugs with a hand controLLed dry air jet (not more than 25psi),and a cLean, Lint-free cLoth Lightly moistened with an approved cLeaning soLvent. Wipe drywith a cLean, dry, Lint-free cLoth.

5.3.3 REPAIR

This section describes the procedure, along with any speciaL techniques, for repLacing damaged ordefective components in the KA 44.

A. Diodes

Diodes used in the KA 44 are siLicon. Use Long nose pLiers as a heatsink under normatsoLdering conditions. Note the diode poLarity before removat.

B. Integrated Circuits

Refer to the integrated circuit maintenance section in the Appendix for removat andreplacement instructions.

C. PC Boards

Use a Low wattage soLdering iron to avoid damaging the boards by excessive heat. A paththat has opened up on the top or bottom of a board can be repLaced with insuLated hookupwire.

D. Transistors

Refer to semiconductor maintenance section in the Appendix for removat and reptacementinstructions.

5.3.4 KA 44 DISASSEMBLY

A. To gain access to the KA 44 electronics assembLy, remove the two Phittips screws that holdthe cap onto the antenna base.

B. FirmLy grasp the cap and Lift it straight off the base, taking care not to damage theconnector pins.


Page 5-4

KINGKA 44

ADF ANTENNA

C. Remove the three Phittips screws from the bottom of AmpLifier ModuLator Board #1, and Liftthis board off the three standoffs.

D. If it is necessary to access the rear of Amplifier ModuLator Board #2, unscrew the threestandoffs and carefuLLy separate the board from the antenna cap. Component reptacement can beperformed without disconnecting the wires to the antenna connector.

E. Short jumpers have been suppLied with the KTs 156 Antenna simuLator. These should be used toconnect the tWo AmpLifier/ModuLator boards during troubleshooting to access the component sideof each board.

5.3.5 KA 44 REASSEMBLY

To reassemble the KA 44, reverse the order of the steps above.

NOTE

When reinserting the eLectronics assembLy into the antenna, useextreme care so as not to bend or damage the connector pins. Makesure that the antenna cap is firmLy screwed down onto the antennabase and that the adjustment hoLe screw in the cap is firmLy inpLace.

5.4 TROUBLESHOOTING

The KA 44 antenna forms an integraL part of the ADF System. The appropriate ADF system Troubleshootingsections contain a system troubleshooting guide which should be used to isoLate a certain probLem toeither the antenna or a receiver circuit. If a probLem has been isotated to the antenna, use thefoLlowing troubleshooting guide in conjunction with the KA 44 Antenna Troubleshooting Flowchart, Figure5-1, schematics and assembLy drawings. Typical voLtage LeveLs are incLuded on the schematics.

To aid in the troubLeshooting, the short jumpers shouLd be used such that access to the component side ofthe boards is possibLe.


Page 5-5

KINGKA 44

ADF ANTENNA

5.4.1 SENSE AND LOOP ANTENNACHECK

Isotate the probLem to the electronics or the antenna itseLf by first removing the electronics assembLyfrom the antenna and making continuity checks on the protruding antenna connector pins. Visuatty checkto see that no pins are shorted to the antenna base casting. Refer to the Antenna Board Schematic, andthe Antenna Assembly Drawing, Figure 6-4, for the fotLowing checks.

A. Measure the DC resistance from the sense signaL (pin 4) to ground (pin 3 or 5). It should beopen. If it is shorted, a new antenna is needed, since the antenna is solidty foamed insidethe plastic sheLL.

B. Measure the DC resistance of each of the Loop windings (pin 1 to 2 and pin 6 to 7). Theyshould be on the order of 5-10 ohms. An open indicates a broken Loop wire, necessitatingantenna replacement.

C. Measure the DC resistance of each Loop end to ground (pin 1 to 3, pin 2 to 3, pin 6 to 3, pin7 to 3). They should att be on the order of 105 ohms. An open indicates a broken connectionor bad resistor inside the antenna, necessitating antenna repLacement.

NOTE

It is extremely unlikely that any of the above tests will faiL,since the antenna is soLidLy foamed inside the sheLL.

5.4.2 SENSE CIRCUIT

A. If the antenna checks satisfactority, the problem ties in the electronics unit. PLace theunit on the KTS-156 simulator with the switches in the fotLowing positions:

Loop Switch - DisabLe

Sense Switch - EnabLe

Mode Switch - Brg. SimuLate

Function Switch - Brg.

Output Load - 50 ohm

Switching Source - Simulator

(If the ADF is also being tested, connect it to the KTS 156 and use the RCVR switching sourceposition.)

B. AppLy a 0.6V + .03V RMS, 550KHz + 100Hz, unmodulated signal from the RF generator and observethe 50 ohm output monitor jack with a scope. A clean sine wave at 112 - 142mV p-p should beobserved. If this sense signaL appears good, proceed to the loop circuits (Section 5.4.3).

c. Check the DC power and ground to the antenna. TP201 should be at 7.6V + .3V. If it is Low,isolate the excessive current drain on the supply Line. If the ADF receiver is being used topower the antenna, ensure that the Low voLtage is not due to excessive current drain in thereceiver. The two ampLifier/modulator boards can be separated and DC power applied to the +9Vpoints individually to aid in the isoLation of any shorts or excessive current drains.Probable causes of excessive drain: faulty FET (0101 - 0105), short circuit on circuitboards, faulty zener diode, CR202, faulty 0201, shorted capacitor.

D. If +9 volt Line is satisfactory, trace the sense signaL through the sense ampLifier and outputbuffer. A 0.6 volt RMS signaL at 550KHz should produce an 80 - 100mVRMS signat at the drainof 0203, 80-100mVRMS at the emitter of 0201, and 40-50mVRMS at the RF output (into 50 ohm).ProbabLe causes of absence of sense signat or weak sense signal: excessive Loading or shorton gate input of 9202, fautty 9202 or 0203, T201 open, faulty 9201, broken Lead on T202.


Page 5-9

KINGKA 44

ADF ANTENNA

5.4.3 LOOP CIRCUITS

A. Turn the sense switch to DISABLE and the Loop Switch to ENABLE. Sync the scope on the RFgenerator output. Set the bearing seLector to 0. A 9 - 15mV RMS switched phase signatshouLd be observed at the 50 ohm output jack. (See Figure 5-2). If no signat is present,trace the signat through the cosine channeL. A 0.6V RMS input at 550KHz shouLd produceapproximateLy 10 - 16mV RMS input at the drains of 9103 and 0104 and 9 - 14 mV RMS at pins 1and 4 of I102. ProbabLe cause of Loop amp probLems: fautty 0103 or 0104, fauLty C116, shortor open circuit.

B. If the signaL appears good at the moduLator input, observe the moduLator output (pin 6 ofJ102). An 18 - 30mV RMS switched phase signat shouLd be present. If not, ensure that themoduLator is receiving the 32Hz angLe 0 switching square wave at pin 5 of J441 and that theattenuated switching waveform is present at pin 7 of I102. If not, isoLate where theswitching waveform is being Lost. ALso, ensure that the moduLators are receiving proper biascurrent by measuring the voLtage across R211. ApproximateLy 1.6 - 2.OmA of current shouLd befLowing through R211. If there is input signaL, proper bias current, and proper DC voLtage,the moduLator is fauLty. If there is no bias current, troubLeshoot the bias network, R211 -213, CR201, CR202 and C206 - C208.

C. The sine channet is identicaL to the cosine channet and the troubLeshooting procedure is thesame. Set the bearing seLector to 90 to troubLeshoot the sine channet.

D. As a finaL check, enabLe the sense switch and the Loop switch. Observe the 50 ohm output jackwith a scope that is synched to the RF generator. A waveform simiLar to Figure 5-3 shouLd beobserved at a reLative bearing of of 0, 90, 180 and 270.

I.82psec 4--

FIGURE 5-2 SWITCHED PHASE LOOP SIGNAL

Rev. 2, Dec. 1980MMOO17-11

Page 5-10

KING

KA 44ADF ANTENNA

INPUT SIGNAL: .6v, 550KHz, unmoduLatedHORIZONTAL: .5usec/divVERTICAL: 20mv/div, AC coupLedTRIGGER: ExternaL, on RF generator

FIGURE 5-3 PHASE MODULATEDOUTPUT SIGNAL

MM0017-11 Page 5-11

11/12/80 KING RADIO CORPORATION ll:An WS ID-F2PARTS LISTING

NAME: ANT ASSV . UNITS KA 0044 ASSY NOS 071-1196- OREV Not 7 LAST 600: ECO DATEs 8/07/80

5YMBOL PART NUMBER DESCRIPTTON HM CODE QUANTITY

047-4956-02 ANT NUT PLT Ed a 1

0895903-06 5CREW PHP 4.40X3/8 FA 2089-5910-24 SCR PHPl0-32X1 1/2 EA 40698003-34 WSHR SPLY LK h4 FA 2089-8018-37 WSHR INTL LK *10 FA 4

200-2697-00 ANT SUB^55Y EA A 1200-2748-00 AMP MODULE FA A 1

Rev. 2, December 1980 Page 6-1

KING RADIO CORPORATIONRFVISION HIS10RY

ENGR APPROVAL:NAMEt ADF ANTENNA ASSY Nos 071-1196-00ASSV DWG: 300-2478-00 UNIT: KA 0044 USED ONS 000-0265

REV CD NO SYMBOL PART NUMBER DESCRIPTION

1

2

KR R7 MAINTENANCE MANUALRFV. 09 JHLY, 1979

3 009-6245-00 DFLETED FRnM 8/M0161142-00 DELETED FROM H/M016-1142-0) DELETED FROM 8/M024-5004-02 DFLETED FROM 8/M025-0018-00 DFLETED FWOM 8/M047-4949-01 DELETED par)M 8/M057-2245-00 DELETED FROM B/M073-0406.02 DELFTED FPOM R/M0880860-00 DFLETED FROM B/M088-0872-00 DFLETED FROM H/M08A-0903-00 DELETED FROM R/M089-5413-05 DELETED FPOM 8/M089-6416-10 DFLETED FRnM 9/M089-8025-30 DELETED FROM 8/M089-8003-34 QTY CHG FROM 6 Tn 4187-1167-00 DFLETED FROM R/M200*2657-00 DFLETED FROM R/M200 6244-00 DELETED FROM R/M200-2697-00 ADDED TO R/M

4 0250018-00 P/N CHG FROM 025-0029-00, DESC

Page 6-2 Rev. 2, December 1980

KING RADIQ CORPORATIONREVISION HISTOWY

ENGR APPROVotNAME: ADF ANTENNA ASSY NO: 071-1196-00ASSV DwG: 300-247A-00 UNIT: KA 0044 USED ON: 0000265-00

REY CO Nn SYMBOL PART NUMBER DESCRIPTI N

025OOl8-11 P/N CHG EW M O25-DO29Ole DESC025.0018-22 P/N CHG FR M 025-002902. DESC025-001833 P/N CHG FR M 025.0029- 3, DESC025-0018-44 P/N CHG FROM 025-0029.04. DESC025-0010-55 P/N CHG FROM 025-0029-05, DESC025-0018-77 R/N CHG FROM 025.0029-07, DESC

5 n]6-10A2-00 P/N ADDED TO BM

6 AlL PART5 DFLETED ON R/M EXCEP071-1396-nT)9 20 2697-00. 089-089-8003-34

200-2748.00 P/N ADDED TO 8/M

********************************************************************

07ADDED 047-4956-02 ANT NUT PLT EA X 1,000

ADDED OS9-59]O-24 1 1/2" SCREW EA 4,000

ADDED 089-8018-37 WSHP INTt lK #10 EA 4,000

KR 07 MAINTFNANCE MANUALREV, 29 DFCFMBER, 1980


KINGKA 44

ADF ANTENNA

THE FOLLOWINGPAGES WERE INTENTIONALLY LEFT OUT:

PAGE 6-7 THROUGH6-12

Rev. 2, Dec. 1980IPLDO5-5

Page 6-7

KlNG RADIO CORPORATIONPARTS LISTING

NAMEl AMP MUDULE UNIT: KA 0044 ASSY NO: 200-2748-00/01REV NO: 4 4

LAST ECO:ECO DATE: 12/22/0 1/27/1

SYMBOL PART NUMBER DESCRIPTION CODE UM -00 -Ol

200-2748-00 AMP MUDULE X200-2748-01 AMP MODULE X

012-1200-00 INSUL CAP EA 1 1

016-1082-00 DC RTV 3145 AR AR AR

025-0018-00 WIRE 26G BLK FT .2 .2025-0018-11 wlRE 26G BRN FT .2 .2025-0018-22 WIRE 26G RED FT .2 .2025-0018-33 wlRE 26G ORN FT .2 .2025-001844 wlRE 26G YEL FT .2 .2025-0018-55 WIRE 26G GRN FT .2 .2025-0018-77 WIRE 26G VIO FT .2 .2

030-2346-00 CONN SUB-MIN M 9P En 1 1030-2352-00 LOCK TAB EA 2 2

057-2253-82 IDENT TAG EA 1 067-2253-83 IDENT LABEL EA - 1

073-0407-03 CAP CSIG w/NKL PLT A EA 1 1

076-1078-00 HEX SPCR EA 3 3

089-5899-04 SCR PHP 2-56X1/4 EA 3 3089-5903-06 SCREW PHP 440X3/8 EA 4 4089-627301 SCREW SELF LOCKING EA 1 1089-8003-34 WSHR SPLT LK #4 EA 4 4

090-0082-17 STUD EA 3 3

150-0020-00 TURING SHNK 18AWG AR AR AR

187-J28-00 CAP GASKET EA 1 1

200-6389-00 B/M AMP/MOD #1 A EA 1 1200-6390-00 S/M AMP/MOD #2 A EA 1 1

Rev. 3, June, 1981 Page 6-13

11/14/80 KING RADlc CORPOWATION 8851 W5 IDF2PARTS LISTING

NAMEl 8/M AMP/M D #1 UNIT: KA 0044 ASSY NDI 200-63R9-00REY 10: 1 LAST ECDs . ECD DATF: 5/30/80

SYMAUL PART NUMBFR DESCRIPTION HM CODE CHANT ITY

no9-6389-on *AMPLIFIER/MnD #1 FA 1

016-1040-00 PC101 CDATING AR AR

C102 104-0001-33 CAP SM lbPF 500V FA 1C103 11l-0001-n0 CAP CR .01UF SOV EA 1ClUA 104-000]33 CAP SM lbPF 500V Fo 1C105 111-0001-00 CAP CR .01UF SOY FA 1C106 096-1082-02 CAP IN LUF 35V En 1C107 096-1082-02 CAP TN lUF 35V FA 1C108 111-DOOl00 Ct.P CR .01UF SOV FA 1ClO9 111-0001-00 CAP CR .01UF SOY EA 1C110 111-0001-00 CAP CR .01UF 50V En 1C112 104-0001-33 CAP SM 15 F 500V EA 1C113 111-0001-00 CAP CR .0]UE SOY Es 10114 JO4-0001-33 CAP SM 15pF Snov EA 1CllS 111-0001-00 CAP CR .01UF SOV A 1C116 096-1087-02 CAP TN 1UF 36V FA 1Cll7 096-1082-02 CAP TN lUF 35V FA 1C118 111-0001-00 CAD CR .01UF 50V EA 1CIL9 111-0001-00 CAP CR .01UF 50V FA 1C120 111-0001-01 CAP CR .1UF SOV EA 3C121 Ill-nOOl-01 CAP CR .lUF 50V En 1

1101 120-3027-01 IC MCIS96G EA 11102 120-3027-01 IC MC3596G VA 1

J101 030-1117-00 RECEPTACLE EA 1J102 030-2200-09 CONNECTUR 9 PIN En 1J103 030-2200-02 C NNFCTOR 2 PIN EA 1

Llol 013-0038-00 FERR BEAD EA )L102 019-2084-31 CH 2,7UH 10% FA 1LlO3 013-0038-00 FERR BEAD EA 1L104 019-208431 CH 2.7UH 10% EA 1LIUS 013-0038-00 FERR BEAD EA 1LJO6 019-2004-31 CH 2,7UM 10% EA 1L107 013-0038-00 FERR BEAD FA 1Llo 019-2084-31 CH 2,7 JH 10% EA 1L109 013-0038-00 FERR HEAD FA 1L110 013-0038-00 PERR READ EA 1L111 OL9-2082-70 CH 240UH 5% EA 1

Q101 007-0375-00 XSTR SET OF 4 FA0105 0070162-00 XSTR 5 NPN MPS6515 EA 1

Rl01 131-0106-13 RES CF 1M EW 5% EA 1


11/14/80 KING RADIO CORPORATIDO 8:53 WS ID-E2PARTS LISTING

NAME: 8/M AMP/MUD #1 UNIT: KA 0044 ASSY MD: 200-6389-0REY ND: 1 LAST ECO: EC DATF: 5/30/80

SYMBOL PART NUMBER DESCRlPT10N Um CnOE QUANTITY

R102 131-0511-l3 RES CF 510 EW 51 En 1R103 131-0153-13 RES CF 15K EW 5% FA 1R104 131-0105-13 RES CF 1M EW 5% En 1RIOS 1310511-13 RES CF 510 EW SW FA 1R106 131-0153-L3 RES CF lbK FW SW FA 1RIO7 1330113-13 PES VA IK 207 8 FA 1R108 131-0150-23 RES CF 15 OW 5% Es 1R109 131-062213 RES CF 6,2K EW $7 FA 1R110 1310432-13 RE5 CF 4.3K FW 5% EA 1R1tl 131-0181-13 RES CF 180 EW ST EA 1Rll2 131-0162-13 RES CF 1,6K Ew ST FA 1R113 131-01A113 RES CE 180 EW 5% EA 1R114 131.0162-13 RES CF 1,6K EW 52 EA 1R115 131-0201-13 RES CF 200 EW 5% FA 1R116 133-0113-13 PES VA IK 207 8 EA 1R117 131-0105-13 RES CF IM EW BW FA \R118 131-0511-13 RES CF 510 EW 51 En 1R119 131-0153l3 RES CF 15K EW 5% En 1R120 131-0105-13 RES CF 1M EW 5% EA 1R121 131Ubl1-33 RES CE 510 Ew 5% En 1R122 131-0153l3 RES CF 15K EW 5% EA 1Rl23 133-011313 RES VA IK 207 8 EA 19124 131-0150-23 RES CF 15 Qw SW FA 1Rl25 131-0622-13 RES CE 6.2K EW 51 FA 1R126 131-0432-13 RES CF 4,3k E 5% EA 1R127 131-0181-33 PES CF 180 EW 5% EA 1R128 131-0162-13 RES CF 1,6K EW 5% FA 1RI29 131-0181-13 PES CF 180 EW S% FA 3RJ30 131-016213 RES CF 1,6K FW 5% EA 1R131 131-022213 RES CF 2.2K EW 5% EA 1Wl32 131-012313 RES CF 12K EW 5% EA 1R133 13L-0223-13 RES OF 22K FW 5% FA 1R134 331.0682-13 RES CF 6,8K FW 55 FA 1

1101 019-3105-00 XFMR RF 7.5MH FA 1T102 OL9-310500 XFMR RF 7.5MM FA l


KING RADIf) CORPORAf fDNREVI510N HIS10pv

ENGP APPR VAL INAME: AMPLIFIER/MODULATOR #1 ASSY NO: 2OO6389-DOA55V DWGI 3 0-6389900 IJNI T: K 0044 HSED [jNt 200-274A-00/

200-2748-01

REY CD NO SYMBOL PART NUMBER DESCRIPTION

1

KR 87 MAINTENANCF MANUALREV, 2. DFCEMPER 1980

Rev. 2, December 1980 Page &-19

11/12/80 KING RADD CORPORATION 11547 WS (D-FPPARTS IISTNG

NAMF: B/M ADF ANT UNIT: KR 0087 ASSY NO: 200-6198-00Rv ND: 9 LAST ECDs ECD DATF: 5/30/80

SYMBOL PART NUMBER OFSCRIPTION UM CUDE QUANTITY

009-6198-00 PC en ADF ANT En 1

016-1040-00 PClOl CHAflNG AR AR

030-1117-00 RECEPTACLE EA 7030-2200-10 CONNFCTOR 10 PIN FA 1

CJD2 104-0001-33 CAP 5M 150F 500V EA 1ClO3 111-0001-00 CAP CR .010F SOY FA 1CIDA 104-0001-33 CAP SM ISPF 500V FA 1C106 111-0001-00 CAP CW .010F 509 EA 1Cin6 096-1082-02 CAP TN 1UF 359 EA 1C107 096-1082-02 CAP TN lUF 35v FA 1C108 111-0001-00 CAP CR .01UF SOY EA 1Clu9 111-0001-00 CAP CR .DIUF SOV EA 1CilO 111-0001-00 CAP CP .0]UE 50V FA 1Cll2 104-0001-33 C^P S" lbPF 500v E^ ]Cll3 lil-0001-no CAP CR .OlHF 50V FA 1C114 104-0001-33 CAP SM 15PF 500V EA 1C115 lll- 001-00 CAP CR .01UF 50V EA 1CllA 096-1082-02 CAP IN JUF 35V FA JC]l7 096-1082-02 CAP TN JUF 35V EA 1Cll8 111-0001-00 CAP CR .01UF 50V FA 1Cl19 111-0001-00 CAP CP .010F SOY FA 1CL20 104-0001-42 CAP SM SPF 100V EA 1C121 111-0001-01 CAP CR .lUE 50V FA 1

CRiol 007-6016-00 010 S IN4154 FA 1CRJO2 O 76016- UIO S LN4154 FA 1

1101 120-3027-01 IC MC1596G EA 11102 120-3027-0] JC MCi596G EA l

L101 013-0038OG FFRR HEAD EA 1L102 019-20R431 CH 2.7UH 10% E A 1LlD3 013-0038-00 FERR BEAD FA JL104 019-20A4-31 CH 2.TUH 10% FA 1LIOS 013-0038-00 FERR BEAD En 1L106 019-2084-31 CH 2.7UH 107 EA 1L107 013-003R-00 FERR READ En 1LIOS 019-2004-31 CH 2.70H 10% FA 1L109 013-0038-00 FERR READ FALl10 019-2084-31 CH 2.7UH 10% FA 1L111 013-0038-00 FERP HEAD FA 1Ll12 013-0038.00 FFRR READ EA 1L113 0 L3-0038-00 FERR HEAO E A 1


11/12/80 KING RADIO CORPORATION 11:47 WS 10-E2PARTS LISTING

NAME: 8/M ADF ANT UNTI KR 0087 ASSY ND: 200-6198-00REV ND: 9 LAST ECU: ECO DATE: 5/30/80

SYMBOL PART NUMBER DESCRIPTION UM CDDE QUANTITY

0101 007-0376-00 XSTR SET OF 4 EA 10102 007-0375-00 XSTR SET OF 4 EA 10103 007-0375-00 STR SET OF 4 EA 30104 007-0376-00 XSTR SET OF 4 EA 10105 007-0428-00 XSTR J309 FA 1

R101 131-0105-13 RES CF IM EW 5% FA 1R102 131-0511-13 RES CF 510 EW 5% En 1R103 131-0153-13 RES CF 15K EW 5% EA 1Ri04 131-0105-13 RES CF 3M EW 5% FA 1RIOS 131-0511-13 RES CF 510 EW 5% En 1RIOA 131-015313 RES CF 15K EW S% FA 1Rl07 133-0113-13 RES VA IK 207 8 FA 1R108 131-0150-23 RES CF IS OW 5% EA 1R109 131-0622-13 RES CF 6,2K FW 5% FA 1Rl10 131-0432-13 RES CF 4.3K EW 5% EA 1R111 131-0181-13 RES CF 180 EW 5% FA ]R112 131-0162-13 RES CF l.6K FW 5% EA 1R113 131-018113 RES CF 180 EW 5% FA 3R114 131-0162l3 RES CF 1.6K EW 5% FA 1

115 131-0201-33 RES CF 200 EW 5% En 1R116 133-0113-11 RES VA 500 20% P FA 1R117 131-0105-13 RES CE 1M EW 5% EA 1R118 131-051113 RES CF 510 EW 5% En 1R119 131-0153-13 RES CF 15K EW 5% FA 1Rl20 131-0105-13 RES CF IM EW 55 PA 1R121 131-0611-13 RES CF 5)D FW 5% EA 1RI22 131-0153-13 RES CF ISK EW 57 En 1Rl23 133-0113-13 RES VA IK 207 B EA 1R124 131-0150-23 RFS CF 15 OW 5% Fo 1RI25 131-0622-13 RES CF 6.2K EW 5% EA 1RJ26 131-0432-13 RES CF 4,3K FW 5% FA 1Rl27 131-0181-13 RES CF 180 EW 5% FA 1R128 131-0162-13 RES CF 1.6K FW 5% FA 1RJ29 131-018113 RES CF 180 EW 5% FA 3R130 131-0162-13 RES CF l.6K FW 5% FA 1Rl32 131-0360-13 RES CF 36 EW 5% FA 1R135 131-0182-13 RES CF l.RK FW 5% EA 1

T101 019-3105-00 XFMR RF 7.5MH FA 1T102 019-3105,00 XFMR RF 7.5MH FA 1


KING WADI EORPDATIONREvlSTHN HIS10BY

ENGR APPROVAllN^ME: AMPLIFIER/MnDHLATOR #1 ASSY NO: 200-6198-00ASSV DwGI 300-6198-00 UNITI KA 0044 HSED ON: 200-2748-00

REV CD NO SYMBOL PART NUMRFR D65CRIPTION

J

KR 87 MAINTENANCF MANUALREV. De JUiYe 1974

4 C106 096-1082-02 P/N CHG FROM 096-1030-02C107 096-LOR2-02 R/N CHG FPOM O96.)O30-02C116 096-1082-02 P/N CMG FWOM 096-1030-02C317 096-30H2-02 P/N CHO FPDM 096-1030-02

5 RJ31 130-0155-13 /N CHG F9nM 131-015513 DFSC

6 R115 131-0201-13 D/N CHG FROM 13). 27]l39 DESC2

R132 131-0271-13 OTY FROM -

7 0105 007-0374-01 P/N CHG EROM 007.0374-00

8 200-2748-DO/USED UN NO. CHG FROM 071-1196-

9 0105 0070428-00 PN CHG FROM 007-0374-01. DESCR131 130-0155-13 P/N DELETED FROM P/MRl32 131-0360-13 P/N CHO FROM 331 271-139 DFSCRl33 131O390-l3 P/N DELETED EWOMM R/MRI34 133-0113*09 P/N DELETFD FROM P/M

KR 87 MAINTENANCF MANUALWEV, 29 DECFMRER, 1980


11/14/80 KING RAnin CORPORATION AtS] WS ID-F2PARTS LISTING

NAMES 8/M AMP/MUD #2 UNITt KA 0044 ASSY NO: 200-6390-00REV NUI 1 LAST ECUr FCD D^TE: 5/30/80

SYMHOL PART NUMBER OFSCRlPTION HM CDDF QUANTITY

009-6390.00 *AMPLIElER/MOD #2 EA 1

036-1040-00 PCl01 COATING AR AR016-1071-00 DC RTV 3140 5R AR

091-0025,00 WSHR XSTR INSHL EA ]

C201 104-0001722 CAP SM 330PF 100V En 1C202 [11-0001-01 CAP CR .lUF 50V FA 1C203 096-10A2-02 CAP TN LUF 35V FA 1C204 111-0001-00 CAP CR .DIUF SOY FA 1C205 111-0001-35 CAP CR IKPF SnV EA 1C206 046-1 82-02 CA TN 1UF 35V FA 1C207 lll-00nl-36 CAP CR 1KPF 50V EA 1C208 096-1082O2 CAP TN JUF 35V EA 1C209 111-000L-DO CAP CR .01UF SOV EA 1C210 111-0001-35 CAP CR LKPF SOY Es 1C211 096-1082-35 CAP TN 22UF 2nV EA 1C212 111-000101 CAP CR ,1UF SOY EA 1C213 111-0001-35 C^P CR lKPF 50V FA 1C214 104-000135 CAP SM 689F 500V EA 1C215 111-0001-05 CAP CR 400680F 50V EA JC2) Ill-0001-Cts CAP CR .0068UF SOY EA 1C217 104-0001-42 CAP SM SPF 100V En 1218 111-0001-01 CAP CR .lUF SOY FA 1C219 111-0001-01 CAP CR .ldF 50V EA J

CR201 097-6016-00 DID \ IN4l54 En lCR202 007-5011-13 010 Z 5.6v IW 57 FA 1CR203 001-6016-00 DIO S IN4154 EA 1CR204 007-6016-00 DIO S LN4154 En 1

l201 019-2083-22 CH 2200UH S% FA 1L202 013-0038-00 FERR BEAD FA 1L203 019-2083-10 CH 680UH 5% FA 1L204 013-0038-00 FERP BEAD EA 1L205 013-0038-00 FERR BEAD FA 1L206 019-2004-63 CH 56HH 10% EA 1L207 013-0038-00 FERR READ EA 1L208 019-2084-3] CH 2.7UH 10% EA 1L209 013-0038-00 FERR READ FA 1

P102 030.2354-04 STRT HEADER 9 PIN FA 1P103 030-2354-05 STRT HEADER 2 PIN EA 1

0201 007-0291-00 XSTR 5 NPN 2N5109 En 1


11/14/80 KING RADIO CORPORATION 8:51 W5 IDF2PARTS LISTING

NAME: B/M AMP/MOD #2 UNII; KA 0044 AS5Y NDs 200-6390-00REY NDI 1 LAST ECUI ECD DATEt 5/30/80

$YMBOL PART NUMBER DESCRIPTION UM COD QUANTTTY

0202 007-0428-00 XSTR J309 FA 10203 0070427-DO XSTR J310 FA 1

R201 1310201-13 RES CF 200 EV 51 FA 1R202 133-0096-53 RES VA 500 Hw 10% FA 1R204 131-0242-13 RES CF 2.48 FW 5% FA 1R205 131-0472-13 RES CF 4,7K Em 57 EA 1R206 131-0300-13 RES CF 30 EW 5% EA 1R207 1310430-13 RES CF 43 FW 5% FA 1R208 131O392-13 RES CF 3.9K Fa 51 EA 1R209 131-0752-13 RES CF 7.5K Ka St FA 1R210 131-0752-13 RES CF 7.5K EW 5* EA 3R211 131-0511l3 RES CF 510 FW 57 FAR212 131-0152-13 RES CF l.SK FW 5% EA 1R2l3 131-0431-13 RES CF 430 EW 51 EA 1R214 131-0392-13 RES CF 3,9V EW $2 FA 1R215 131-0752-13 RES CF 7,bK EW SI En 1R216 131-0752-13 RES CF 7.5K En St En 1R217 131-0150-13 RFS CF 15 EW 5% EA 1R220 1310300-13 RES CF 30 Ew SW EA 14221 131-0182-13 RES CF 1.AK EW 5 FA 1R222 131-0184]3 RES CF 180K FW 5% EAR223 13)-0114-13 RES CF 110K FW 5% EA 3

1201 0195094-00 XFMR RF EA 11202 0]9-7092-00 XFMp pwR FA 1

TP201 008-0096-01 TFRM TST PT FA 1


KING RADIO (OPPflRATIDMRvlSION HISTORV

ENGR APPROVAL:NAME: AMPLIFIER/MUDHLATOR #2 ASSY ND: 200-6390.00ASSY imG: 3n0-6390-DO HNI T: KA DO44 USED N: 2OO-274AOO/

200-274R-01

REV CO NU SYMBUL PART NUMBER DESCWIPTTON

1

KR 87 MolNTFNANCF MANUALREv. 2 DECEMRERv 1980

Rev. 2, December 1980 Page 6-3l

11/12/80 . .kiMG RADIO CORPORATION 11840 WS ID-F2PARTS LISTING

NAME: 8/M AMP/MOD -UNIT: KR 0087 A55Y NOt 200624300REY NO: 6 LAST ECD: FCO D^TE4 1/17/80

SYMBOL PART NUMRER DESCRIPTION HM CODE QUANTITY

008-0096-01 . TERM TST PT . FA 1

0096243-00 AMPLIFIER 80 #2 EA 1

016-1040-00 PC101 COATING R AR0161071-00 DC RTV 3140 no AR

030-2354-01 STRT HEADER 10 PIN FA 1

091-002500 WSHR X5TR INSUL FA ]

C201 104-0001-22 CAP SM 330PF 100V En 1C202 llt-00nl-Ol CAP CR .lUF 50V FA 1C203 096-1082-02 CAP TN IUF 35V FA 1C204 111-0001-00 CAP CR ,01UF SOV FA 1C205 111-0001-35 CAP CR IKPF Snv EA 1C206 096-1082-02 CAP TN lUF 35v EA 1C207 111-0001-35 CAP CR 1KPF sov A 1C208 096-1082-02 AP TN lUF 35V EA 1C209 111-0001-00 CAP CR .01UF SOV EA 1C210 111-0001-35 CAP CR 1KPF SOV En 1C211 097-0056-60 CAP AL 22UF 25V EA 1C212 111-0001-01 CAD CR .luF SOY EA 1C213 111-0001-35 CAD CR IKPF SQv EA 1C214 104-0001-35 CA SM 6800 500V En 1C215 111-0001-05 CAP CR .0068HF SOV EA 1C216 111-0001-05 CAP CR .00680F 50v FA 1

CR201 007-601600 DIfJ 5 1N4154 FA 1CR202 007-5011,13 DIO 7 5.6V lW 5% FA 1

L201 019-2003-22 CH 2200UH 5% EA 1L202 013-0038.00 FERR READ EA 1L203 019-2083-10 CH 680DH 5% FA 1L204 013-003A-00 FERR READ EA )L205 013-0038-00 FFRP READ TA 1L206 014-2084-63 CH 560H 107 FA

0201 007-0291-00 STR 5 NON 2NlO9 FA 1

R201 131-0271-l3 RES CF 270 EW 5% FA 1R202 133-0096-54 RFS vA LK Hw lot En 1R203 131-062-13 RFS CF 6.8K FW 5% En 1


11/12/80 KING RADIO CORURATION ll:40 WS ID-E2PARTS LISTING

NAME3 HjM AMP/MUD UNIT: KR 0087 ASSY NO! 200-6243-00REY NO: 6 LAST ECO: ECD DATEI 1/17/80

SYMBOL PART NUMBER DESCRIPTIDE HP CODE QUANTITY

R204 1310242-13 RES CF 2.4K EW 5% EA 1R205 131-0472l3 RF5 CF 4.7K EW 5% FA 1R206 131-0300-33 RES CF 30 EW 5% FA 1R207 131-0430]3 RES CF 43 FW 5% FA 1R20A 131-0392-13 RES CF 3.9K EW 5% EA 1R209 131-0752l3 RES CF 7.5K EW SW EA 3R210 13L-0752-13 RES CF 7,5K FW SW FA 1R211 131-0511-13 RFS CF 510 EW 57 FA 1R212 131-0152-13 RES CF l.5K EW 57 FA 1R213 131-0431-13 RE5 CF 430 FW 5% EA 1R214 131-0392-13 RES CF 3.9K EW 5% FA 1R215 131-0752-13 RES CF . SK Fw 51 EA 14216 131-0752-13 Rs CF 7.5K EW 51 EA 1R217 131-0150-13 RES CF 15 EN St RA 1

T201 019-6094-00 XFMR RF RA 1T202 019-7092-00 XFMR PWR FA 1


KING RADIO CORPORATIONREvlSION HIS10RY

ENGR APPROVAL:NAMEt AMPLIFIFR/MODULATOR #2 ASSY NO: 20D6243-DOASSY DWGI 300-6243-00 UNIT: KA 0044 USED ON: 2002748-00

REV CD NO SYMBOL PART NUMBER DESCRlpTION

KR 87 MAINTFNANCE MANUALRFV. 09 JULYe 1979

4 091-0025.00 P/N ADDED TO R/M

5 C203 096-1082-02 P/N CHG FROM 096-1030-02C206 096-1082-02 P/N CHG FROM 096-1030-02C208 096-1082-02 |N CHG FROM 096-2030-02

6 200-2748-00/USED ON NU, CHG FPOM 071-1196-

KR 87 MAINTENANCE MANUALREV. 2 DECEMBFR, 1980


MAINTENANCE/0VERHAULMANIJAL

KA44B

ADFANTENNA

KING RADIO CORPORATION.400 NORTH ROGERS ROAD OLATHE, KANSAS, U.S.A.

KINGKA 44B

ADF ANTENNA


THEORYOFOPERATIONParagraph Page

4.1 GeneraL 4-1

4.2 GeneraL Circuit Theory 4-1

4.3 DetaiLed Circuit Theory 4-3

SECTIONVMAINTENANCE

Paragraph Page

5.1 Generat Information 5-1

5.2 Test and ALignment 5-15.2.1 Generat Information 5-15.2.2 Test Equipment Required 5-15.2.3 Test And Atignment Procedure

5.3 Overhaut 5-35.3.1 Inspection 5-35.3.2 Cleaning 5-45.3.3 Repair 5-45.3.4 KA 44B Disassembly 5-55.3.5 KA 44B Reassembly 5-5

5.4 Troubleshooting 5-55.4.1 Sense And Loop Antenna Check 5-95.4.2 Sense circuit 5-95.4.3 Loop Circuits 5-10

SECTIONVIILLUSTRATEDPARTSLIST

Item Page

1 ADF Antenna AssembLy 6-12 Antenna Amplifier Modute 6-53 Amplifier/Modulator #1 6-94 Amplifier/ModuLator #2 6-13

LISTOFILLUSTRATIONS

Figure Page

4-1 KA 44B Antenna System Block Diagram 4-2

5-1 KA 44B Antenna TroubLeshooting FLowchart 5-75-2 Switched.Phase Loop Signal 5-105-3 Phase Modulated Output Signat 5-11

iRev. 3, June 1981MMOO18-20

KINGKA 44B

ADF ANTENNA

LISTOFILLUSTRATIONS

Figure Page

6-1 FinaL AssembLy Board 6-36-2 Antenna Amplifier ModuLe 6-76-3 AmpLifier/Modulator Board #1 and Schematic 6-116-4 AmpLifier/Modulator Board #2 and Schematic 6-15

iiRev. 3, June 1981MMOO18-20

KINGKA 44B

ADF ANTENNA

SECTIONIVTHEORYOFOPERATION

4.1 GENERALThe KA 44B antenna is an integraL part of some King Radio ADF systems. It contains both the Loop andsense antennas as weLL as an eLectronics package containing active circuitry. The circuitry ampLifiesthe antenna signaLs, then phase modulates them into a form that is readily demodulated into bearinginformation by the receiver. The antenna output is buffered in order to aLLow a non-criticaL Length RFcable to be used between the antenna and the receiver.

For a compLete discussion of basic ADF principles, see Section 4.1 of the appropriateMaintenance/0verhaul ManuaL.

4.2 GENERALCIRCUITTHEORY(Refer to the KA 44B System BLock Diagram, Figure 4-1, for the fotLowing discussion.)

Both the Loop and sense antennas that an ADF system require are contained in the KA 448 antenna. TheLoop antenna consists of perpendicuLar windings around a bLock of ferrite core materiat which serves toincrease the magnetic fLux density through the windings. The Loop signats are amplified by separate FETdifferentiaL ampLifiers and appLied to the inputs of a pair of baLanced moduLators. The carrier inputsto the modulators are two 32Hz sguare waves sup Lied from the receiver. The modulating signat to thesine channet Lags the other by 90 (Leads by 90 for a top mounted antenna). The moduLating signatssimpLy reverse the phase of the Loop RF signaLs at a 32Hz rate. Output signats from the moduLators aresummed with the ampLified and phase compensated sense signaL. The sense signaL must be 90 out of phasewith the Loop signats at the summing point, so phase compensation is necessary to maintain the 90 phasedifference over frequency. This quadrature summing operation effectiveLy produces a phase moduLation ofthe sense signat, which is further amptified before being supptied to the receiver.

Rev. 3, June 1981MOO18-17

Page 4-1

KINGKA 448

ADF ANTENNA

SINE LOOP

MALDAUNLCAEDOR

COSINEBALANCEDLOOP

AMP MODULATOR OUTPU PHASE MODULATEDBUFFE * RFOUTPUT

32HzLi90 gaINPUT

32HzLO gINPUT

LOOP ENABLEINPUT

SENSEANTENNA

COMPHANSSEATION

FIGURE 4-1 KA 44B ANTENNASYSTEM BLOCK DIAGRAM(Dwg. No. 696-3269-00, R-0)

Rev. 2, Dec. 1980MMOO18-17 Page 4-2

KINGKA 44B

ADF ANTENNA

4.3 DETAILEDCIRCUITTHEORYRF energy from the sense antenna is applied to the gate of cascode connected FET current amplifier 0401,0202. Transient suppressor diode CR401 shunts aLL input signals above .7 voLt to ground, removingpotential noise from the smaLLer RF input signaL. AmpLifier 0202 holds the drain vottage of currentampLifier 0401 steady white the amplified current varies proportionally to the input voLtage. The Lowinput impedance of 0202 provides good toLeration to the high capacitive input impedance from the cablejoining the two circuit Locations in the aircraft. The sense signal is applied to the source of 0202,current amplified and appLied across Load R221 and C218.

The sine and cosine Loop antennas supply signals with varying amplitude relationships to nearly identicalchanneLs. The sine channet and the differences that exist are described as fotLows: RF signals from thesine Loop windings are apptied to the inputs of JFET class A differential ampLifiers 0101 and 0102.Feedback network C103, R103 provides AC coupting and gain stabitization. Variable capacitor C101balances the high frequency gain of the differential amplifiers. One megohm gate resistors R101 and R104provide a DC path to ground for the minute gate bias currents. Resistors R107 and R123 vary the drainbias currents of the ampLifiers, thereby adjusting the gain and input impedance. These potentiometersalso adjust the Loop impedance to 550KHz (Loop resonance at a 2K Load). The amplifiers Load the antennaLoop windings considerably in order to de-Q them and atLow a fLatter Loop frequency response. The LoopampLifier deveLops a signaL across transformer T101 which is coupted through a voltage divider comprisedof R111 through R114, to the signat input of baLanced modulator I101. Bias network R109, R110 establishesthe operating region of sine moduLator I101. A 32Hz square wave is used as the carrier input to themodulator. It produces relativeLy high Levet voltage across resistor R208 at carrier input I101-7 and 8,causing the RF input signaL to appear at output terminats I101-6 and 9, reversing phase at a 32Hz rate.Some AC gain is provided by the modulators; potentiometers R116 and R202 externally vary the emitterresistance of an amplifier stage within the modulators, thereby aLLowing adjustabte gain. Sine gain and0.E. adjustment potentiometer R202 is externaLLy accessibLe through a hoLe in the cap casting of theantenna to compensate for unequal signal pickup by the sine and cosine Loops due to asymmetric fieldfringing by the airframe. Modulators I101 and I102 are only turned on when the receiver is in the ADFmode and is Locked onto a valid station, otherwise, a Low signat on the Loop enable Line from thereceiver shuts off bias currents into pin 5 of the modulators, effectiveLy shutting them off. Themodulators are enabled when the Low signat is removed from the Line, thereby attowing bias current tofLow through R213, R212, CR201 and R211.

The sense output of 9202 drives phase compensation network T201, c201. This network maintains a constant90 phase between the Loop and the sense signals since the relative phase of the Loop signal changes overfrequency. At the output of this network, the sense signat is summed with the Loop moduLator outputs,which are 90 out of phase with the sense signat. This quadrature summing produces the phase modulationof the Larger amptitude sense carrier.

Coupting capacitor C202 applies the sense carrier to emitter fottower 0201 which buffers the RF signaLand drives transformer T202. This with R207 impedance matches the signat to the 50 ohm input impedanceof the receiver. Bias network R205, R204 establishes the operating Levet of buffer amplifier 0201. Anetwork comprised of C214 and R217 inhibits unwanted oscittations. Network R206, C203 provides RFdecoupting from the +9VDC suppLy. Bead inductor L205 suppresses parasitic oscitLations. A high-passfilter network consisting of C215, C216, and L206 attenuates unwanted Low frequency signals to improvethe spurious response of the system.

Rev. 3, June 1981MOO18-17

Page 4-3

KINGKA 448

ADF ANTENNA

SECTIONVIMAINTERANCE

5.1 GENERALINFORMATIONThis section contains test, aLignment, cleaning, repair and troubleshooting procedures for the KA 44B ADFAntenna. Included are detailed assembLy/disassembLy instructions, and troubleshooting instructions.

Information concerning semiconductor test equipment, semiconductor and integrated circuit maintenance andspecific integrated circuits used in the KA 44B Antenna may be found in Appendix A at the end of thismanual. It is suggested that Appendix A be consuLted before attempting to service the KA 44B.

5.2 TESTANDALIGNMENT5.2.1 GENERAL INFORMATION

The following test procedure may be fottowed to determine whether or not the KA 44B is operatingproperty. If it is not, alignment procedures are detaiLed in order to bring the KA 44B up to its minimumperformance standards.

The King KTS 156 Antenna Simulator with the KTA 156 adaptor or the TIC CES-116A (Modified for Equalized E& H Field) are used in order to simulate sense and loop signals of the proper phase and amptituderelationship. The simulator also contains an internaL clock that can supply the 32Hz moduLation signats,enabLing the KA 44B to be tested and aLigned with or without the ADF receiver. Refer to themaintenanceloverhaut section of the KTS-156 for a detaiLed explanation of its operation.

5.2.2 TEST EQUIPMENT REQUIRED

A. Power Supply +13.75VDC 8 1.0 amp or +27.5VDC e .5 amp(+9.0VDC 8 .5 amp if KTS-156 only is used)

B. Oscittoscope - Tektronix 465 or equivaLent

C. RF Signal Generator - 2DOKHz - 1800KHz - HP 606A/B or equivalent

D. DigitaL Voltmeter - FLuke 8600A or equivatent

E. Frequency Counter - Monsanto 100A or equivaLent

F. AC VTVM - BaLlantine 310 or equivatent

G. King KTS 156 Antenna Simulator with KTA 156 Adaptor

5.2.3 TEST AND ALIGNMENT PROCEDURE

Make the foLlowing tests and any adjustments as necessary to reatign the antenna.

A. Remove the eLectronics assembly from the antenna and connect it to the KTS-156 making surethat the KTA 156 adaptor is in place. Connect the RF generator to the RF input jack of theKTS-156 and power the unit with +14VDC. PLug the pigtait connector into the connector on theantenna eLectronics unit.


Page 5-1

KINGKA 44B

ADF ANTENNA

B. The KTS-156 switches shouLd be in the foLLowing positions:

Loop Switch - Enable

Sense Switch - DisabLe

Mode Switch - CaLibrate

Function Switch - CaLibrate


Bearing SeLector - 0


NOTE

If the ADF receiver is aLso being tested and aLigned, connect theADF to the KTS 156 and switch the switching source to RCVR.)

C. Apply a 550KHz + 100Hz unmoduLated input signaL from the RF generator to the KTS-156.

D. Connect the VTVM to the Loop Monitor jack and adjust the Levet of the RF generator to give a5mV + .2mV reading on the VTVM.

E. Turn the Function Switch to COS and adjust R123 to match the 5mV + .2mV reading of step D, +.2mv. Resecure the pot to keep it in pLace.

F. Now turn the Function Switch to SIN, turn the bearing seLector to 90, and adjust R107 tomatch the reading in step D, + .2mV. Resecure this pot aLso.

G. Now pLace these switches in the foLLowing positions:


Sense Switch - EnabLe



H. Monitor the 50 ohm output monitor jack with the VTVM.

I. Increase the Levet of the 550KHz input signat to 0.6V RMS + .03V at the RF generator output.

J. Check for a 39mV + 13mV RMS reading on the VTVM.

K. Now change the input frequency to 200KHz + 100Hz whiLe maintaining the generator output Levetof 0.6V RMS.

L. Note the output voLtage at the 50 ohm output monitor jack.

RF output voLtage (200KHz) = mV.

M. At this point, it may be desirabLe to introduce some quadrantaL error (0.E.) compensation intothe antenna in order to simpLify the compensation procedure once the unit has been reinstaLLedinto the aircraft. It has been found that 6 of 0.E. is average on most Light aircraft. Ifit is desired to pre-compensate for Q.E., take the vottage measured in step L and divide it by3.9. This is the desired sine Loop voLtage. Note it beLow. If it is not desired tointroduce Q.E. compensation, divide the vottage of step L by 4.75 to get the desired sine Loopvottage. The desired cosine Loop voLtage is aLWays equaL to the voLtage of step L divided by4.75.

Desired sine Loop voLtage: mV RMS -

Desired cosine loop voLtage: mVRMS


Page 5-2

KINGKA 44B

ADF ANTENNA

N. Now pLace these switches in the foLLowing positions:

Loop Switch - EnabLe

Sense Switch - DisabLe

Bearing Selector - 90

0. Adjust R202 through the hoLe in the cap casting to the desired sine Loop voltage noted above +.2mv. Once again this voLtage is measured with the VTVMat the 50 ohm output monitor jack.

P. Turn the bearing seLector to 0 and adjust R116 to the desired cosine loop voLtage + .2mV.Secure this pot in place.

Steps Q through U should only be done if transistor set 0101 - 0104 is reptaced.

G. Switch the KTS 156 to the CAL mode and place the function switch in the SIN position. Measureand note the 200KHz sine Loop output at the 50 ohm output jack.

R. Place the KTS 156 function swi.tch in the COS position. Change the input frequency to 1799KHz+ 100Hz white maintaining a generator output Levet of 0.6VRMS. Measure and note the 1799KHz

osine

Loop output at the 50 ohm output jack.

S. Switch the KTS 156 to the SIN function. Adjust C101 for a 1799KHz output of 1.22 times theLevet obtained in step R.

NOTEThis assumes that the antenna is being adjusted for 6 of 0.E.compensation. If no compensation is desired, adjust C101 for anoutput equaL to that obtained in step R.

T. Change the input frequency to 200KHz + 100Hz white maintaining the .6VRMS generator output.Reset R202 to the Levet obtained in stp Q.

U. Repeat steps S and T untiL there is no further change in either setting.

5.3 OVERHAUL

5.3.1 INSPECTION

This section contains instructions to assist in determining, by inspection, the condition of the KA 448assemblies. Defects resutting from wear, physicaL damage, deterioration, or other causes can be found bythese inspection procedures. To aid inspection, detaiLed procedures are arranged in aLphabeticaL order.

A. Capacitors, Fixed

Inspect capacitors for case damage, body damage, and cracked, broken, or charred insulation.Check for Loose, broken, or corroded terminal studs, Lugs, or Leads. Inspect for Loose,broken, or improperty soLdered connections.

B. Connectors

Inspect connectors for broken parts, deformed sheLLs or cLamps, and other irregularities.Inspect for cracked or broken insulation and for contacts that are broken, deformed, or out ofaLignment. ALso, check for corroded or damaged pLating on contacts and for Loose, impropertysoldered, broken, or corroded terminaL connections.

C. Covers and Shields

Inspect covers and shieLds for punctures, deep dents, and badLy worn surfaces. ALso, checkfor corrosion and damage to finish.

D. InsuLators

Inspect insuLators for evidence of damage, such as broken or chipped edges, burned areas, andpresence of foreign matter.


KINGKA 44B

ADF ANTENNA

E. Potentiometers

Inspect aLL potentiometers for evidence of damage such as dents, cracked insulation, or otherirregularities.

F. Resistors, Fixed

Inspect the fixed resistors for cracked, broken, bListered, or charred bodies and Loose,broken, or improperty soLdered or corroded terminaL connections.

G. RF Coits

Inspect aLL RF coits for broken Leads, Loose mountings, and Loose, improperty soldered, orbroken terminal connections. Check for crushed, scratched, cut or charred windings. Inspectthe windings, Leads, terminats and connections for corrosion or physicaL damage. Check forphysicaL damage to forms and tuning sLug adjustment screws.

H. Transformers

1. Inspect for signs of excessive heating, physicaL damage to case, cracked or brokeninsuLation, and other abnormaL conditions.

2. Inspect for corroded, poorty soLdered, or Loose connecting wires.

I. Wiring

Inspect wiring for breaks in insuLation, conductor breaks, and improper dress in reLation toadjacent wiring or chassis.

5.3.2 CLEANING

A. Using a cLean, Lint-free cLoth Lightly moistened with a reguLar cLeaning detergent, removethe foreign matter from the equipment case and unit front panets. Wipe dry using a cLean,dry, Lint-free cLoth.

B. Using a hand controLLed dry air jet (not more than 15psi), bLow dust from inaccessibLeareas. Care shouLd be taken to prevent damage by the air bLast.

C. CLean the receptacLes and pLugs with a hand controLLed dry air jet (not more than 25psi),and a cLean, Lint-free cLoth LightLy moistened With an approved cLeaning soLvent. Wipe drywith a cLean, dry, Lint-free cLoth.

5.3.3 REPAIR

This section describes the procedure, aLong with any speciaL techniques, for repLacing damaged ordefective components in the KA 448.

A. Diodes

Diodes used in the KA 448 are siLicon. Use Long nose pLiers as a heatsink under normaLsoLdering conditions. Note the diode poLarity before removat.

B. Integrated circuits

Refer to the integrated circuit maintenance section in the Appendix for removat andrepLacement instructions.

C. PC Boards

Use a Low wattage soLdering iron to avoid damaging the boards by excessive heat. A path thathas opened up on the top or bottom of a board can be reptaced with insuLated hookup wire.

D. Transistors

Refer to semiconductor maintenance section in the Appendix for removmL and reptacementinstructions.


KINGKA 44B

ADF ANTENNA

5.3.4 KA 44B DISAssEMBLY

A. To gain access to the KA 44B electronics assembly, remove the two PhiLLips screws that holdthe cap onto the antenna base.

B. FirmLy grasp the cap and Lift it straight off the base, taking care not to damage theconnector pins.

C. Remove the three Phittips screws from the bottom of AmpLifier ModuLator Board #1, and Liftthis board off the three standoffs.

D. If it is necessary to access the rear of Amplifier ModuLator Board #2, unscrew the threestandoffs and carefuLLy separate the board from the antenna cap. Component repLacement can beperformed Without disconnecting the wires to the antenna connector.

E. A short 9-conductor jumper and 2 conductor jumper has been suppLied with the KTS 156 AntennaSimutator. This shouLd be used to connect the two Amptifier/ModuLator boards duringtroubLeshooting to access the component side of each board.

5.3.5 KA 44B REASSEMBLY

A. To reassembLe the KA 448, reverse the order of the steps above.

NOTE

When reinserting the electronics assembly into the antenna, useextreme care so as not to bend or damage the connector pins. Makesure that the antenna cap is firmLy screwed doWn onto'the antennabase and that the adjustment hole screw in the cap is firmLy inpLace.

5.4 TROUBLESHOOTINGThe KA 44B antenna forms an integraL part of some King Radio ADF Systems. The appropriateTroubLeshooting sections contain a system troubleshooting guide which shouLd be used to isoLate a certainprobLem to either the antenna or a receiver circuit. If a probLem has been isoLated to the antenna, usethe foLLowing troubLeshooting guide in conjunction with the KA 44B Antenna TroubLeshooting FLowchart,Figure 5-1, schematics and assembly drawings. Typical voltage LeveLs are incLuded on the schematics.

To aid in the troubLeshooting, the short 9-conductor jumper and 2 conductor jumper shouLd be used suchthat access to the component side of the boards is possible.

The KA AAB antenna may be checked with a TIC CES-116A which had been modified per fieLd buttetin from TICentitLed, "Modification Instructions For Equalized E & H Fields in CES-116A". This check wiLL isoLateany ADF probLems to either the antenna or receiver.

Rev. 3, June 1981MMOO18-18 Page 5-5

KINGKA 44B

ADF ANTENNA

5.4.1 SENSE AND LOOP ANTENNACHECK

Isolate the problem to the electronics or the antenna itself by first removing the electronics assembLyfrom the antenna and making continuity checks on the protruding antenna connector pins. VisuatLy checkto see that no pins are shorted to the antenna base casting. Check to see that aLL pins are making goodcontact with the electronics assembly. Refer to the Antenna Board Schematic, and the Antenna AssemblyDrawing, Figure 6-4, for the foLLowing checks.

A. Measure the DC resistance of each of the Loop windings (pin 1 to 2 and pin 6 to 7). TheyshouLd be on the order of 5-10 ohms. An open indicates a broken Loop wire, necessitatingantenna repLacement.

B. Measure the DC resistance of each Loop end to ground (pin 1 to 3, pin 2 to 3, pin 6 to 3, pin7 to 3). They should aLL be on the order of 105 ohms. An open indicates a broken connectionor bad resistor inside the antenna, necessitating antenna reptacement.

NOTEIt is extremeLy unLikely that any of the above tests wiLL fait,since the antenna is soLidLy foamed inside the sheLL.

5.4.2 SENSE CIRCUIT

A. If the antenna checks satisfactority, the probLem probabLy Lies in the eLectronics unit.PLace the unit on the KTS-156 simuLator and KTA 156 adaptor with the switches in the foLLowingpositions:


sense Switch - EnabLe





(If the ADF is aLso being tested, connect it to the KTS 156 and use the RCVR switching sourceposition.)

B. AppLy a 0.6V + .03V RMS, 550KHz + 100Hz, unmoduLated signat from the RF generator and observethe 50 ohm output monitor jack with a scope. A cLean sine wave at 74 - 147mv p-p shouLd beobserved. If this sense signaL appears good, proceed to the Loop circuits (Section 5.4.3).

C. Check the DC power and ground to the antenna. TP201 shouLd be at 7.6V + .3V. If it is Low,isoLate the excessive current drain on the supply Line. If the ADF receiver is being used topower the antenna, ensure that the Low voLtage is not due to excessive current drain in thereceiver. The two ampLifier/moduLator boards can be separated and DC power appLied to the +9Vpoints individuatty to aid in the isotation of any shorts or excessive current drains.ProbabLe causes of excessive drain: fautty FET (0101 - 0104, 0202), short circuit on circuitboards, fautty zener diode, CR202, fauLty 0201, shorted capacitor.

D. If +9 voLt Line is satisfactory, trace the sense signal through the sense ampLifier and outputbuffer. A 0.6 voLt RMS signat at 550KHz should produce an 52 - 104mV RMS signaL at the drainof 0202, 52-104mV RMS at the emitter of 0201, and 26-52mV RMS at the RF output (into 50 ohm).ProbabLe causes of absence of sense signaL or weak sense signat: T201 open, faulty 0201,broken Lead on T202 or 0202 defective.

E. If the sense circuit tests good, but the unit is still defective in the ANT mode, it is LikeLythat the preamp is defective and the antenna needs to be replaced.


Page 5-9

KINGKA 448

ADF ANTENNA

5.4.3 LOOP CIRCUITS

A. Turn the sense switch to DISABLE and the Loop Switch to ENABLE. Sync the scope on the RFgenerator output. Set the bearing seLector to 0. A 9 - 15mv RMS switched phase signaLshould be observed at the 50 ohm output jack. (See Figure 5-2). If no signaL is present,trace the signaL through the cosine channet. A 0.6V RMS input at 550KHz shouLd produceapproximateLy 10 - 16mV RMS input at the drains of 0103 and 0104 and 9 - 14 mV RMS at pins 1and 4 of I102. ProbabLe cause of Loop amp probLems: fautty 0103 or 0104, fauLty C116, shortor open circuit.

8. If the signaL appears good at the modulator input, observe the moduLator output (pin 6 ofJ102). An 18 - 30mV RMS switched phase signaL shouLd be present. If not, ensure that themoduLator is receiving the 32Hz angLe 0 switching square wave at pin 5 of J441 and that theattenuated switching waveform is present at pin 7 of I102. If not, isoLate where theswitching waveform is being Lost. ALso, ensure that the moduLators are receiving proper biascurrent by measuring the voLtage across R211. ApproximateLy 1.6 - 2.0mA of current shouLd befLowing through R211. If there is input signaL, proper bias current, and proper DC vottage,the moduLator is fautty. If there is no bias current, troubLeshoot the bias network, R211 -R213, CR201, CR202 and C206 - C208.

C. The sine channet is identicaL to the cosine channet and the troubLeshooting procedure is thesame. Set the bearing seLector to 90 to troubLeshoot the sine channet.

D. As a finaL check, enabLe the sense switch and the Loop switch. Observe the 50 ohm output jackwith a scope that is synched to the RF generator. A waveform simiLar to Figure 5-3 shouLd beobserved at a reLative bearing of of 0, 90, 180 and 270.

9-15mV RMS

I.82sec

FIGURE 5-2 SWITCHED PHASE LOOP SIGNAL


Page 5-10

KINGKA 44B

ADF ANTENNA

MMMEREM1------WHER

--

INPUT SIGNAL: .6V, 550KHz, unmoduLatedHORIZONTAL: .5usec/divVERTICAL: 20mv/div, AC couptedTRIGGER: Externat, on RF generator

FIGURE 5-3 PHASE MODULATED OUTPUT SIGNAL

Rev. 2, Dec. 1980MMOO18-18

Page 5-11

KlNG RADIO CORPORATIONPART5 LISTING

NAME: ADF ANT ASSY UNIT: KA 0044R ASSY NO: 071-1234-00REV NO: 2

LAST ECO:ECO DATE: 12/12/0

SYMBOL PART NUMBER DESCRlPTON CODE UM -00

071-1234-00 ADF ANT ASSY X

047-4956-03 BACKUP PLATE A EA 1

089-5666-20 SCRFLHPl/4-28X11/4 EA 20895666-36 SCRFLHPl/4-28X21/4 EA 2089-5903-06 SCREW PHP 4-40X3/8 EA 2089-8003-34 wsHR SPLT LK #4 En 2

200-2809-00 ANI/AMP MOL A EA 1200-2811-00 ANTENNA SUBASSY A FA 1

Rev. 3, June, 1981 Page 6-1

KING RADO CORPORATIONPARTS LISTING

NAME: ANT/AMP MOL UNIT: KA 00448 ASSY ND: 200-2809-00REV NO: 2

LAST ECU:ECO DATE: 9/02/0

SYMBOL PAR NUMBER DESCRIPTION CODE UM -00

200-2809-00 ANT/AMP MOL X

012-1200-00 INSUL CAP En 1

016-1082-00 UC RTV 3145 AR AR

025-001800 WlRE 26G BLK FT ,2025-0018-11 wlRE 26G BRN FT ,2025-0018-22 WIRE 26G RED F1 ,2025-0018-33 WIRE 26G ORN FT ,2025-0018-44 WIRE 26G YEL FT .2025-0018-55 WIRE 26G GRN FT ,2025-0018-77 WlRE 26G VID FT .2

030-2346-00 CONN SUS-MIN M 9P EA 1030-2352-00 LOCK TAR EA 2

073-0407-03 CAP CSTG w/NKL PLT A EA 1

076-1078-00 HEX SPCR EA 3

089-5699-04 SCP PHP 2-56X1/4 EA 3089-5903-06 SCRFW PHP 4-40X3/8 bo 4089-6273-01 SCREW SELF LOCKING En 1089-8003-34 WSHR 5PLT LK #4 EA 4

090-0082-17 STUD EA 3

150-0020-10 TURING SHNK 18AWS AR AR

187-1228-00 CAP GASKET EA 1

200-6421-00 PM AMP/MOD BD #} A En 1200-6422,00 HM AMP/MU 80 #2 A EA 1


V ING RADIC CORPORATIONPARTS LISTING

NAM6 BM AMP/MOD BD #1 UNT3 KA 00448 ASSY NO: 200-6421 00REV NO: 2

LAST ECO:ECO DATE: 9/20/0

SYMBOL PAkT NUMBER DESCRIPTION CODE UM -00

200-6421-00 BM AMP/MOD BD #1 X

009-6421-00 PC BD AMP #l EA 1

016-1040-00 PClO1 CDATING AR AR

Cl01 102-0040-00 CAP VA3.5-18PF250V Es 1C102 104-0001-15 CAP SM 10PF 100V EA 1C103 111-0001-00 CAP CR .01UF SOV EA 1C104 104-0001-15 CAP SM 10PF 100V EA 1C105 111-0001-00 CAP CR.,01UF 50V EA 1C106 096-1082-02 CAP TN 1UF 35V EA 1C107 096-1082-02 CAP TN lUF 35V EA 1C108 111-0001-00 CAP CR .010F SOV EA 1C109 111-0001-00 CAP CR ,0tUF SOV EA 1C110 111-0001-00 CAP CR .01UF 50V EA 1C112 104-0001-31 CAP SM 27PF 500V EA 1Cll3 111-0001-00 CAP CR .01UF SOV EA 1C114 104-0001-31 CAP SM 2/PF 500V EA 1C115 111-0001-00 CAP CR .01UF SUV EA 1C116 096-1082-02 CAP TN lF 35V EA 1Cll7 096-1082-02 CAP TN luF 35V EA 1C118 111-0001-00 CAP CR .01UF SOY EA 1Cll9 111-000100 CAP CR .01UF 50v EA 1C120 111-0001-01 CAP CR .lF SOY EA 1C121 111-0001-01 CAP CR .1UF 50V En 1

1101 120-3027-01 IC MClb96G EA 11102 120-3027-01 IC MCIS96G En 1

Jl03 030-1111-00 RECEPTACLE EA 1J102 030-2200-09 CONN6CTOR 9 PIN EA 1J103 030-2200-02 CONNECTOR 2 PIN EA 1

L101 013-0038-00 FERR READ EA 1L102 017-0041-00 FILibR R-L NETWK EA 1L103 013-0038-00 FERR READ EA 1L104 017-0091-00 FILTER R-L NETWK EA 1L105 013-0038-00 FERR B6AD EA 1LlO6 017-0091-00 FILTER R-L NETwK EA 1Ll0? 013-0038-00 FERR BEAD EA 1L108 017-0091-00 FILTER R-L NETWK EA 1L109 013-0038-00 FERR READ EA 1L110 013-0038-00 FERR BFAD EA 1


KING RADIO CORPORATlNPARIS LISTING

NAME: BM AMP/MUU 80 #1 UNIIe KA 00448 ASSY NO: 200-6421-00REV ND: 2

LAST ECD:ECO DATE: 9/20/0

SYMBOL PART NUMBER DESCRIPTION CODE UM -00

L111 019-2082-70 CH 240UH 5% Es 1

0101 007-0375-00 XSTR SET U 4 En 10102 007-0375-00 XSTR SET OF 4 RF -0103 007-0375-00 XSIR SET OF 4 RF -0104 007-0375-00 XSTR SET OF 4 RF -0105 007-0162-00 XSTR S NPN MPS6515 EA 1

R101 13J-n105-13 RES CF Im EW 5% EA 1Rl02 131-0751-13 RES CF 750 EW 5% EA 1RIO3 131-0113-13 RES CF llK EW 5% EA 1R104 131-0105-13 RES CF Im EW 5% En 1Rl05 131-0751-13 RES CF 750 Ew 5% EA 1R106 131-0113-13 RES CF llK EW 5% EA JR107 133-0113-13 RES VA IK 20% 8 Eh JR108 131-0150-23 RES CF 15 OW 5% Eh ]9109 131-0622-13 RES CF 6.2K EW 5% En 1R110 131-0432-13 RES CF 4.3K EW 5% EA 1R111 131-0181-13 RFS CF 180 EW 5% En 1Rll2 131-0162-13 RES CF 1.6K EW 5% EA 1R113 131-0181-13 RES CF 180 EW S% EA 3R114 131-0162-13 RES CF l.6K Ew 5% En 1RllS 131-0361-13 RES CF 360 EW 5% E^ lR116 133-0113-13 RES VA lK 20% B En 1Rl17 131-0105-13 RES CF LM EW S% EA )Rll8 131-0271-13 RES CF 270 EW 5% Eh jRl19 131-0113-13 RES CF 11K EW 5% En 1Rl20 131-0105-13 RES CF JM EW 5% EA 1Rl21 131-0271-13 RES CF 270 Ew 5% EA 1Rl22 131-0113-13 RES CF 11k EW 5% EA 1R123 133-0113-13 RES VA 1K 20% B EA 1Rl24 131-0150-23 RES CF 15 QW 5% EA 1R125 131-0622-13 RES CF 6.2K EW 5% EA 1Rl26 131-0432-13 RES CF 4.3K EW 5% En 1Rl27 131-0181-13 RES CF 180 EW 5% En 1Rl28 131-0162-13 RES CF l.6K EW S% EA 1R129 131-0181-13 RES CF 180 EW 5W EA 1R130 131-0162-13 RES CF l.6K EW 5% EA 1Rl31 131-0222-13 RES CF 2.2K EW 5% En 1R132 131-0123-13 RES CF 12K EW 5% EA 1R133 131-0223-13 RES CF 22K EW 5% EA 1

T101 019-3105-00 XFMR RF 7.5MH EA 1T102 019-3105-00 XFMR RF 7.5MH Eo 1

Page 6-10 Rev. 3, June, 1981

KING RADIO CORPORATIONPARTS LISTING

NAME: BM AMP/MUD BD #2 UNIT: KA 00448 ASSY NO: 200-6422-00REV NO:

LAST ECDsECO DATE:

SYMBOL PART NUMBER DESCRIPTION CODE UM -00

200-6422OO HM AMP/MOD BD #2

009-6422-00 AMP/MOD BOARD #2 EA 1

016-1040-00 PClOl COATING AR AR016-1071-00 DC RTV 3140 AR AR

091-0025-00 WSHR XSTR INSUL EA 1

C201 104-0001-28 CAP SM 240PF 100V EA 1C202 111-0001-01 CAP CR .lUF SOV En 1C203 096-1082-02 CAP TN lUF 35V EA 1C204 111-0001-00 CAP CR .01UF SOV En 1C205 111-0001-35 CAP CR 1KPF SOY En 1C206 096-1082-02 CAP TN luF 35V EA 1C207 111-0001-35 CAP CR 1KPF SOV EA 10208 096-1082-02 CAP TN lUF 35V EA 1C209 111-0001-00 CAP CR .010F SOV EA 1C210 111-0001-35 CAP CR IKPF 50V E^ 1C211 096-1082-35 CAP TN 220F 20V EA 1C212 111-0001-01 CAP CR .lUF 50V EA 1C213 111-0001-35 CAP CR 1KPF SOV EA 1C214 104-0001-35 CAP SM 68PF 500V EA 1C215 111-0001-05 CAP CR .0068UF SOY En 1C216 111-0001-05 CAP CR .0068UF SUV EA 1C218 111-0001-01 CAP CR .1UF SOV EA 1C219 111-0001-01 CAP CR .1UF 50V EA 1

CR201 007-6016-00 DIO 5 1N4154 En 1CR202 007-5011-13 010 Z 5.6V Iw 5% EA 1

L201 019-2083-22 CH 22000H 5% EA 1L202 013-0038-00 FERR BEAD EA 1L203 019-2083-10 CH 680UH SW EA 1L204 013-0038-00 FERR BEAD EA 1L205 013-0038-00 FERR BEAD EA 1L206 019-208463 CH 56UH 10% En 1

P102 030-2354-04 STRI HEADER 9 PIN EA 1Pl03 030-235405 STRT HEADER 2 PIN EA 1

0201 007-0291-00 XSTR S NPN 2NS109 EA J

Rev. 3, June, 1981 Page 6-13

KING RADIO CORPORATIONPARTS LISTING

NAMEs BM AMP/MOD BD #2 UNIT: KA 00448 ASSY ND: 200-6422 00REV NO*

LAST ECO:ECO DATE:

SYMBOL PARI NUMBER DESCRIPTION CODE UM -00

0202 007-0427-00 XSTR J310 EA 1

R201 131-0331-13 RES CF 330 EW 5% EA 1R202 133-0096-54 RES VA lK HW 10% En 1R204 131-0392-13 RES CF 3,9K EW 5% EA 1R205 131-0752-13 RES CF 7.5K EW 5% EA 1R206 131-0300-13 RES CF 30 EW 5% EA 1R207 131-0430-13 RES CF 43 EW 5% EA 1R208 131-0392-13 RES CF 3.9K EW 5% EA 1R209 131-0752l3 RES CF 7.SK EW 5% EA 1R210 131-0752-13 RES CF 7.5K EW 5% EA 1R211 131-0511-13 RES CF 510 EW 5% EA 1R212 131-0152-13 RES CF l.5K EW 5% EA 1R213 131-0431-13 RES CF 430 EW 5% EA 1R214 131-0392-13 RES CF 3,9K EW 5% EA 3R215 131-0752-13 RES CF 7.5K EW 5% EA 1R216 131-0752-13 RES CF ?.SK EW 5% EA 1R217 131-0150l3 RES CF 15 EW 5% EA 1R220 131-0432l3 RES CF 4.3K EW 5% EA 1R221 131-0222-13 RE5 CF 2.2K EW 5% EA 1R222 131-0184-13 RE5 CF 180K EW 5% EA 1R223 131-0114-13 RES OF 110K EW 5% EA 1

T201 019-5105-00 XFMR RF 550KHZ EA 17202 019-7092-00 XFMR PWR EA 1

TP201 008-0096-01 TERM TST PT EA 1

Page 6-14 Rev. 3, June, 1981

MAINTENANCE/0VERHAULMANUAL

KTS156ANTENNASIMULATOR

TESTSET

KING RADIO CORPORATIONo400 NORTH ROGERS ROAD OLATHE, KANSAS, U.S.A.

KINGKTS 156

ANTENNASIMULATOR TEST SET

TABLEOFCONTENTS

SECTIONIGENERALINFORlWATION

Paragraph Page

1.1 Introduction 1-1

1.2 Equipment Description 1-1

1.3 TechnicaL Characteristics 1-1

1.4 Accessories 1-1

SElfTIONIIINSTALLATION

Paragraph Page

2.1 Generat 2-1

2.2 Unpacking and Inspecting Equipment 2-1

SECTIONIIIOPERATION

3.1 Description of Switches and Connectors 3-1

LISTOF ILLUSTRATIONSFigure Page

2-1 KTS 156 Top View 2-2

3-1 Front Panet Diagram 3-23-2 Rear Panet Diagram 3-3

iRev, 2, Dec. 1980MMOO18-8

KINGKTS 156



Paragraph THEORYOFOPEFLATIOli esse4.1 GeneraL 4-1

SECTIONVMAINTENANCE

Paragraph Page

5.1 Generat Information 5-1

5.2 Test and ALignment 5-15.2.1 Test Equipment Required 5-15.2.2 Test and Atignment Procedure 5-2.

5.3 Overhaut 5-45.3.1 Inspection 5-45.3.2 Repair 5-45.3.3 Disassembty/Assembty 5-5

5.4 TroubLeshooting 5-5

SECTIBINVIILLUSTRATEDPARTSLIST

Item Page

1. Finat Assembly - Test Set 6-12.. Cabte Harness AssembLy 6-73. KA 44 Antenna Amptifier Modute 6-114. Antenna Modute connector 6-155. Antenna Simutator 6-196. KTA 156 6-25

LISTOFILLUSTRATIONSFigure Page

4-1 Divider Network 4-1

5-1 KTS 156 Test Set Up 5-15-2 KTA 156 ALignment circuit 5-3

6-1 FinaL AssembLy (Sheet 1 of 2) 6-36-1 FinaL Assembly (Sheet 2 of 2) 6-56-2 cabLe Harness Assembly 6-96-3 KA 44 Antenna Amptifier Modute 6-136-4 Antenna ModuLe connector 6-176-5 Antenna SimuLator Test Set Board & Schematic (Sheet 1 of 2) 6-216-5 Antenna SimuLator Test Set Board & Schematic (Sheet 2 of 2) 6-236-6 KTA 156 Board and Schematic 6-276-7 KTA 156 (-01 Version) 6-29

TABLESTabte Page

5-1 Loop Input Signats 5-25-2 KTA 156 Atignment circuit 5-3

Rev. 3, June 1981MMOO18-19 ii

KINGKTS 156

ANTENNA SIMULATOR TEST SET

SECTIONIGENERALINFORMATION

1.1 INTRODUCTIONThe KTS 156 Antennna SimuLator simuLates signats picked up by the KA 44/44B antenna and is to be used toaLign the KA 44/448 ELectronics Unit with or without an ADF Receiver. When testing a KA 44B, the KTA 156must be instaLLed on the KTS 156. The KTS 156 may aLso be used to troubLeshoot the ADF system byproviding signaLs with bearing information.

1.2 EQUIPMENTDESCRIPTIONThe KTS 156 contains circuitry which is designed to simuLate the sense and Loop signaLs in the properamptitude and phase reLationships normaLLy provided by the KA 44/448 antenna. The proper circuitry isprovided aLso so that the ampLifiers on the KA 44/44B ELectronics Unit may be caLibrated. Connectors areprovided to input the proper RF signaL and power suppLy and to monitor the various outputs. InternaLcircuitry has been incLuded to simuLate aLL the interface and controL signaLs that normaLLy connect theADF Receiver to the KA 44/448 Antenna such as the 32Hz switching signaLs, Loop enable, and the properpower suppLy. An internaL 9 volt reguLator provides internat regutation such that the externaL powersuppLy can range from 11 - 30VDC.

1.3 TECHNICALCHARACTERISTICS

SPECIFICATION CHARACTERISTIC

Size: 7.8" by 3.4" by 5.28"

Weight: 1.81 Lb.

Power Requirements: 13.75VDC 8 1.0A or 27.5VDC 8 0.5A DC

Frequency Range: 200KHz - 1800KHz

1.4 UNITSANDACCESSORIESSUPPLIEDThe KTS 156 Accessory Kit (KPN 050-1864-00) incLudes the foLLowing items:

KTS 156 CabLe Harness (KPN 200-2708-00)KA 44 Antenna Amp ModuLe (KPN 200-2748-01)KA 44 TroubLeshooting Jumper, 10 wire (KPN 155-2125-00)KA 44/44B TroubLeshooting Jumper, 9 wire (KPN 155-2125-02)KA 44/44B TroubLeshooting Jumper, 2 wire (KPN 155-2125-01)7 Pin Connector Adapter (KPN 030-2373-01)


Page 1-1

KINGKTS 156

ANTENNASIMULATORTEST SET

SECTIONIlINSTALLATION

2.1 GENERALINFORMATIONThe KTS 156 is designed to be used as a bench test unit.

2.2 UNPACKINGANDINSPECTINGEllUIPMENTExercise extreme care when unpacking the equipment. Make a visuaL inspection of the unit for evidence ofdamage incurred during shipment. If a cLaim for damage is to be made, save the shipping container tosubstantiate the cLaim. When aLL equipment is removed, pLace in the shipping container aLL packingmateriaLs for use in unit storage or reshipment.

A removabLe 7 pin connector adapter has been supptied with the KTS 156. This double-ended connector isused to connect the KA 44 Antenna Electronics Unit to the KTS 156 Antenna SimuLator. To instaLL theadapter, remove the two screWs on the top of the unit that hold the two smaLL retaining cLips on eitherside of the antenna connector socket. Insert the shorter pins of the 7 pin adapter into the sockets andsecure the retaining cLips over the pLastic header with the screws. The Longer side of the adapter pinsshould now be extruding, ready to mate with the sockets on the KA 44 Electronics Unit. (Refer to Figure2-1)

A KTA 156 adapter unit is supplied with the KTS 156 and must be used when testing a KA 448. The KTA 156mounts on top of the KTS 156 instead of a KA 44 Electronics Unit. The KA 448 Electronics Unit thenmounts on top of the KTA 156.

The short 10 conductor jumper cable that has been supplied in the Accessory Kit is to be used as an aidin bench testing and troubLeshooting the KA 44 ELectronics Unit. The jumper cable attows a technician toseparate the doubLe circuit boards of the KA 44 and perform service tasks with greater ease. Nine (9)pin and two (2) pin jumper cables are also supplied. These are to be used on Late modet KA 44's and KA44B ELectronics Units.

The KTS 156 cable Harness that has been supptied is to be used when using the KTS 156 in conjunction withthe entire ADF System. It is designed to provide att the necessary connections between the KTS 156, theKA 44/44B Antenna, the ADF Receiver and the KI 227 Indicator.


Page 2-1

KING

KTS 156ANTENNASIMULATOR TEST SET

047-5396-00/01 (RETAINER CLIP)030-2373-OO(CONN.ADAPTER)

089- 5899-05 (SCREW)

(BUTTON)OSI~Ol50-OI

(STAND-OFF)O76- \\44-00/02 -'

FIGURE 2-1 KTS 156 TOP VIEW

MMOO18-12Rev. 1, Sept., 1979 Page 2-2

KINGKTS 156


SECTIONll!OPERATION

3.1 EXPI.ANATIONOFSWITCllESANDCONNECTORS(Refer to front panet diagrams, Figure 3-1)

Function Switch - Chooses which operation the test set performs.

Bearing - EnabLes the bearing selector, i.e., aLLows the KTS 156 to supply simulated bearing signaLsto the KA 44/448 ELectronics Unit.

CaLibrate - This position aLLows a reference reading to be taken from the Loop monitor jack duringantenna aLignment.

Sin - This position aLLows adjustment of KA 44/448 sine channet.

Cos - This position attows adjustment of KA 44/44B cosine channeL.

Bearing SeLector - When "Bearing" is selected on both Function Switch and the Mode Switch, this switchseLects the simulated station bearing.

Switching Source - SeLects the source that powers the KA 44/44B ELectronics Unit. In the RCVR position,an externaL ADF Receiver can be used to drive the KA 44/44B antenna. In the Sim position, the KTS 156simulator itseLf provides the power and controt signats for the KA 44/44B.

Mode switch* - Determines in conjunction with the Function Switch, whether the KTS 156 is in the bearingsimulator mode or the calibrate mode.

*Notes: 1) Mode Switch must be in "Bearing" position when Function Switch is in "Bearing" position.

2) When Function Switch is in "Cat", "Sin", or "Cos" positions, the Mode Switch must be in"Cat" position.

Sense Switch - EnabLes or disables the simuLated sense signaL at the input to the KA 44/448 ElectronicsUnit.

Loop Switch - Enables or disabLes the Loop modulators within the KA 44/44B Electronics Unit. The enableposition turns on the Loop modulators attowing the Loop signals to pass to the RF output. DisabLeposition turns off the Loop modulators, stopping the Loop signat output to the RF output.

Output Load - In the "RCVR" position, the RF output of the KA 44/44B Electronics Unit is passed to theADF Receiver. In the "50 ohm" position, the RF output is connected to a 50 ohm Load so that the outputcan be monitored on an osciLLoscope or VTVM.


Page 3-1

KINGKTS 156


SWSOUF E MODE

PWR LOAD LOOP SENSEON 50^ EN EN .IL RCVR BRG

r-, SIM - CAL

BRG MODEOFF RCVR DIS DIS

35 180 CAL SIN90 225 BRG COS

JI56545 270

O 315

KTS 156

FIGURE 3-1 FRONT PANEL DIAGRAM

(Refer to Rear Panet Diagram, Figure 3-2)

I/0 CONNECTORS

RF Input - An RF signat from an externaL signaL generator is applied here.

50 Ohm Output - An osciLLoscope or VTVM is connected here so that the KA 44/44B ELectronics Unitoutput may be monitored when the "Output Load" switch is in the 50 ohm position.

Loop Monitor - Monitors the voltage appLied to the primary of T101. Voltage is monitored when LoopampLifiers are being aligned.

Power SuppLy - ExternaL DC poWer suppLy applied here; either 14VDC or 28VDC.

Audio Output - Point at which a 500 ohm speaker or Load may be connected so that the audio from theADF Receiver may be monitored.

J1567 - The connector through which the KA 44 Electronics Unit or KTA 156 receives the sense and Loopinput signats from the antenna simulator.

P1561 - The connector through which the KA 44/44B receives +9VDC, 32Hz switching signaLs, Loop enabteand through which the RF output is passed.

J1565 - Connector for the ADF Receiver.

P1542 - The connector on the KTA 156 through which the KA 44B Electronics Unit receives the sense andLoop input signals.


Page 3-2

KINGKTS 156


LOOPINPUT AUDIO SO^

JI566

FIGURE 3-2 REAR PANEL DIAGRAM

NOTEDetailed operation procedures for using the KTS 156 AntennaSimulator to aid in the troubleshooting and alignment of the ADFReceiver and the KA 44/44B Antenna are contained within theMaintenance sections of those respective units.

Rev. 3, June 1981 Page 3-3MMOO18-13

KINGKTS 156


SElfil0NIVTHEORYOFOPERATION

4.1 GENERALThe RF input appLied at J1561 is used to generate the sense and Loop signaLs. The resistive divider atthis input is designed so that a 50 ohm Load is presented to the RF generator. A 1 voLt rms input isequivalent to providing a 1 voLt per meter field strength to the KA 44/448 antenna. The sense signat,which is appLied to pin 4 of J1567, is padded down to modeL the effective height and capacitance of theKA 44/448 sense antenna. If a KTA 156 is used, the sense signaL at pin 4 of J1567 is appLied to pin 4 ofJ1541 of the KTA 156 and is padded again and preamplified before going to the KA 448 electronics unit viapin 4 of P1542.

Now, tracing the circuit through transformer T101, it is seen that R106 is used to adjust the sense toLoop ratio (ratio of sense magnitude to Loop magnitude) by adjusting the magnitude of the Loop signaL.Inductor L102 is included to provide the 90 phase difference between the sense and Loop signaLs at550KHz. This inductor must be removed during calibration to give the desired sensitivity during LoopampLifier adjustment. This is done by the Mode Switch. An emitter foLLower stage is placed on theprimary to provide a high impedance buffer which isoLates the capacitance presented by a coaxiaL cabLeconnector to J1562.

T101 is a broadband RF transformer with the secondary center tapped. It provides baLanced signats to theprecision divider network. The precision divider network consists of 1% resistors which divide theapplied vottage into the reLative LeveLs shown:

10IS'.y +.707

24 .3I?' O

24 .319'. - .707

10I

-l.O

FIGURE 4-1 DIVIDER NETWORK

When the Function Switch and the Mode Switch are in the "Bearing" position, the Bearing Switch can berotated to select various combinations of these voLtages. For exampLe, at 0 , cos = 1 and sin = 0, sothe cosine Loop ampLifier is connected between +1.0 and -1.0 and both inputs to the sine Loop ampLifierare connected to ground. At 135, cos = -0.707 and sine = 0.707, so the positive input to the cos amp isconnected to -0.707 and the negative input to +0.707 white the positive input to the sin amp is connectedto +0.707 and the negative output to -0.707. Low vaLues of resistance are used to provide a Low sourceimpedance to the ampLifiers.

When the Function Switch and the Mode Switch are in the "CaL" position, R2D1 is presented to thetransformer secondary in order to modet the desired input impedance of the Loop ampLifiers at 550KHz.When the Function Switch is in the "Sin" or "Cos" position and the Mode Switch is in the "CaL" position,the sine or cosine Loop ampLifier, respectiveLy, is presented to the transformer secondary so that thein

Documents

KA 44B Maintenance