1

2N2/20

A 20-Meter Discrete Component CW Transceiver built

Manhattan-style

Designed by: Jim Kortge, K8IQY(jokortge@prodigy.net)

2

Discussion Topics

Background Transceiver Features and Performance Design Overview Construction Overview Q and A in remaining time

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Background 2N2/20 derived from 2N2/30 Overcomes weak areas in original

2N2/40 design– 2N2222 contest constraints removed– New circuits for RF T-R, RF Amp, Mixers,

Xtal Filter, Audio Preamp, Rx Mute, & Final Amplifier

– Revised circuits for VFO, Rx Mixer Amp, & IF Amp/Roofing Filter

Project driven by builder interest

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Features and Performance Receiver

– Electronic attenuator/T-R switch– Double-tuned input filter - 400 KHz BW– “Noiseless” Norton RF Amp– Commercial level 7 DBM– 4+2 pole crystal filters ~ 500 Hz BW– JFET audio mute– 3 audio stages– Varicap tuned VFO - drift < 200 Hz– RIT

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Features and Performance Receiver (continued)

– Sensitivity (MDS) = -130 dBm– Blocking Dynamic Range = 107 dB– Intermod Dynamic Range = 91 dB– 3rd Order Intercept = 7 dB– IF Rejection = 91 dB– Image Rejection = 73 dB– Opposite Sideband Rejection = 75 dB– Rx Current = 185 ma

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Features and Performance Transmit

– Commercial level 7 DBM– Double-tuned Cascode RF Amp– 2SC2166 Final Transistor– Settable Output Power - 9 Watts Max– Spurious Output < -50 dBc– Solid State QSK Keying– Tx Current = 735 ma (3.5 watts output)

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Design Overview

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VFO Schematic

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VFO Output Spectrum

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20 Meter RF Spectrum

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RF Gain/T-R Switch Sch

12

RF Gain/T-R Switch Resp

13

Input BP Filter Sch

14

Input BP Filter Response

15

RF Amp & DBM Sch

16

PM Amp & Xtal Filter Sch

17

Main Xtal Filter Resp

18

IF Amp Sch

19

IF Amp Resp

20

Roofing Filter – Preamp Sch

21

Audio Preamp Res

22

Rx Mute – Main Audio Sch

23

Main Audio Amp Resp

24

Tx LO & DBM Sch

25

Cascode Amp Sch

26

Driver – LP Filter Sch

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Tx Output Spectrum

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Construction Overview

Manhattan-style construction 5 X 7 inch substrate footprint Sub-modules used where advantageous Custom case KD1JV frequency readout Digital photo documentation

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RIT & RF Gain Modules

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Substrate Layout

31

VFO

32

RxTx Switch - DBM

33

PM Amp – Prod Det

34

Audio Preamp – Main Amp

35

Receiver Overall

36

Tx LO – Cascode Amp

37

Driver – LP Filter

38

Transmitter Overall

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Packaged 2N2/20 - Front

40

Packaged 2N2/20 - Rear

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Question/Answer

What did you not understand? What item(s) need more discussion?

Rx/Tx

Rx RF

Rx Mixer

Switch

Amp

Tx FinalTx DriverTx Cascode Amp

Tx Mixer

Tx LO

VFO

Xtal Filter & Post-mixer Amp

Prod Det

Rx LO

Rx Audio Pre-amp

Rx Audio Mute

Rx MainAudio Amp

1.5 1.5 1.5 1.5 1.0

1.0

1.5

1.0

Substrate Layout

1.5Rx InputFilters

Roofing Filter & IF Amp

T/R Switch RF AmpBP Filter Mixer PM Amp Xtal Filter IF Amp Prod Det Audio Rx Mute Audio

VFO Buffer RF Amp

Rx LO

MixerTx LO RF AmpBP Filter BP Filter Driver Final LP Filter

Xtal Filter

RIT

Receive Strip

Transmit Strip

Spkr

Ant

3.0-3.1 MHz

11 MHz

11 MHz

11 MHz 11 MHz14 MHz

RF Gain &

2N2/20 Block Diagram

RxInput

TxVcc

RxPMA

RxVFO

TC15-50 pF

R1

47K

R24.7K

D11N4148

D21N4148

D31N4148

R33.9K

D42v-2ma

D51N4148

Pot11K Audio Taper

Parts with pot

L15.6 uH

C11200 pF

TC25-50 pF

C282 pF

C32.0pF

L218T/T37-6 1.2uH

L318T/T37-61.2uH

C482 pF

TC35-50 pF

C51200 pF

Rx RF Gain

Rx T/R Switch Rx Input Filter

K8IQY's 2N2/20, 20 Meter CW Transceiver

L4100uH

R456

T11:4:11T/FT37-43

1T4T

R527

Q1PN2222

C60.1uF D6

2v-2ma

R63.3K

11T

C70.1uF

C80.1uF

Vcc

Rx RF Amp

Vcc

C90.1uF

1 Gnd2 IF3 RF 4Gnd

5Gnd

6LO

M1ADE-1

Rx Mixer R716

R816

R968

R1051

Jim Kortge, K8IQYFeb, 2004 - Sheet AA

Q22N4124

D71N4148

TxVFO

RxVFO

TxVcc

VFOA

VFOB

VFOC

VFOA

VFOB

VFOC

R11270

D81N4735A

D91N4004

Vcc

D10MV1662

Pot220K-10T

R1247K

C100.1uF

C110.1uF

C1256pF

L5

6.9uH

TC43-30pF

C13180pF

C1456pF

R135.6K

R1410K

C151000pF

C161000pF

R151.8K

R161K

R173.3K R18

47

Varicap Tuned VFO (3-3.1 MHz)

Q3PN2222

Q4PN2222

Q5PN2222

C17100pF

R19100

C180.1uF

C19120pF

TC55-50pF

+13dBm T216:3:1/FT37-61

16T 3T

1T +1dBm

C200.1uF

R2020K

R2127

C210.1uF

40T/T50-7

K8IQY's 2N2/20, 20 Meter CW Transceiver

Jim Kortge, K8IQYFeb, 2004 - Sheet AB

R2210K

R2327K

R2427K

R251.5K

R261.5K

R2747K

C220.01uF

POT11K

C230.1uF

D11MV209

Q62N7000

C240.1uF

C2556pF

Optional RIT

Parts with VFOParts with pot

14.2uH

C260.1uF

C270.1uF

RxPMA RxXRF

K8IQY's 2N2/20, 20 Meter CW Transceiver

T38TBifilar/FT37-43

R2843

C280.1uF

R2910

T49TP-3TS/BN2402

R3027

C290.1uF

Vcc

R313.3K

D122v-2ma

C300.1uF

R3210

R3310

R34130

Rx Main Xtal Filter

C31680pF

Y111.0MHz

C32220pF

C33220pF

Y211.0MHz

C34680pF

Y311.0MHz

C35220pF

C36220pF

Y411.0MHz

C37680pF

Rx Post-Mixer Amp

T59TP-3TS/BN2402

C38120pF

R3556

R36100

C390.1uF D13

1N4148

D141N4148

R374.7K

R3827 C40

0.1uF

Vcc

R391.5K

R4027

R4156

C410.001uF

T617TP-5TS/T37-2

C42

100pF TC65-50pF

Rx IF Amp

Jim Kortge, K8IQYFeb, 2004 - Sheet AC

C430.1uF

1.16uH

Q7PN2222

Q8MPSH10

Q9MPSH10

RxXRF

RxMute

K8IQY's 2N2/20, 20 Meter CW Transceiver

Jim Kortge, K8IQYFeb, 2004 - Sheet AD

C44680pF

Y511.0MHz

C45220pF

C46220pF

Y611.0MHz

C47680pF

R4233

Rx Xtal Roofing Filter

T710T-Trifilar/FT37-43

D151N5711

D161N5711

D171N5711

D181N5711

C480.1uF

C490.1uF

Rx Product Detector

C500.1uF

L61mH

R4351

C5147uF

R4433K

R4510K

R462.7K

C523300pF

R4727

R481K C53

10uF

VccR49100

Rx Audio Pre-Amp

C541uF

C551uF

R50270

R5110K

R522.2K

C56100pF

C57150pF

L78.2uH

Y711.0MHz

TC75-50pF

Rx Local Oscillator

Vcc

Q10PN2222

R53100

C580.1uF

C5963pF

L83.9uH

R54820

C600.01uF

+7dBm

R5551

(30+33)

Q11PN2222

TxVcc

RxMute

Keyline

TxVcc

T81200CT - 8

R5647K

R57220

C61100uF

R5847K R59

220C62100uF

C634.7uF

R60180

C640.1uF

R612.7K

R622.7K

Vcc C65470uF

SP1SPEAKER

Rx Main Audio Amplifier

C660.1uF

Q12PN2222

Q13PN2222

Q14PN2222

Q15PN2222

R632.2M

Pot310K Audio Taper

C670.1uF

R6410K

D S

G

R651M

D191N4148

Rx Mute

1.3

C680.1uF

C690.1uF

Q16J176

D201N5711

D211N5711

K8IQY's 2N2/20, 20 Meter CW Transceiver

Jim Kortge, K8IQYFeb, 2004 - Sheet AE

J112-13.8vdc F1

2amp

D221N4744A

S1Part of pot3

Vcc

DC Power R664.7K

R671K

C700.1uF

Vcc

Rx/Tx Switch

C710.22uF

Q172N2907

TxVFO

TxVcc

TxDriver

R6891

R69120

1Gnd2IF3RF4 Gnd

5 Gnd

6 LO

M2ADE-1

Tx Mixer

R706.8

R71150

R726.8

T92TP-20TS/T37-6

TC85-50pF

C7247pF

C7333pF

R734.7K

R7415K

R75150

C740.01uF

T1020TP-3TS/T37-6

TC95-50pF

C7547pF

R7615K

C760.1uF

TR150

Tx Cascode Amp

R77270

R7810K

R792.2K

C77100pF

C78150pF

L98.2uH

Y811.0MHz

TC105-50pF

Tx Local Oscillator

Vcc

Q18PN2222

R80100

C790.1uF

C8063pF

L103.9uH

R81820

C810.01uF

+7dBm

R8251

(30+33)

R8327

Jim Kortge, K8IQYFeb, 2004 - Sheet AF

K8IQY's 2N2/20, 20 Meter CW Transceiver

1.2uH

1.2uH

Q19PN2222

Q20PN2222

TxDriver

TxVcc

RxInput

C820.1uF

R844.3K

R851K R86

10

R8715

C830.1uF

T119TP-2TS/FT37-43

Tx RF Final

Q212N2222A

C840.1uF

Q222SC2166

R8851

L114T/FT37-43

Tx RF Driver

C85470pF

L1210T/T37-6

C86680pF

C87220pF

L1312T/T37-6

C8830pF

C890.1uF

C900.1uF

Tx LP Filter

C910.1uF

C923.3uF

VccC9356pF

Jim Kortge, K8IQYOct, 2004 - Sheet BG

R8927

0.34uH 0.52uH

C9447pF

K8IQY's 2N2/20, 20 Meter CW Transceiver

J2Antenna

2N2/20 Bill of Materials - Version 092704

Item Qty References Value1 2 C1,C5 1200 pF2 4 C12,C14,C25,C93 56pF3 1 C13 180pF4 2 C15,C16 1000pF5 4 C17,C42,C56,C77 100pF6 2 C19,C38 120pF7 2 C2,C4 82 pF8 4 C22,C60,C74,C81 0.01uF9 1 C3 2.0pF

10 6 C31,C34,C37,C44,C47,C86 680pF11 7 C32,C33,C35,C36,C45,C46,C87 220pF12 1 C41 0.001uF13 1 C51 47uF14 1 C52 3300pF15 1 C53 10uF16 2 C54,C55 1uF17 2 C57,C78 150pF18 2 C59,C80 63pF19 37 C6,C7,C8,C9,C10,C11,C18,C20,C21,C23,C24,C26,C27,C28,C29,C30,C39,C40,C43,C48,C49,C50,C58,C64,C66,C67,C68,C69,C70,C76,C79,C82,C83,C84,C89,C90,C91 0.1uF20 2 C61,C62 100uF21 1 C63 4.7uF22 1 C65 470uF23 1 C71 0.22uF24 3 C72,C75,C94 47pF25 1 C73 33pF26 1 C85 470pF27 1 C88 30pF28 1 C92 3.3uF29 8 D1,D2,D3,D5,D7,D13,D14,D19 1N414830 1 D10 MV166231 1 D11 MV20932 6 D15,D16,D17,D18,D20,D21 1N571133 1 D22 1N4744A34 3 D4,D6,D12 2v-2ma35 1 D8 1N4735A36 1 D9 1N400437 1 F1 2amp38 1 J1 12-13.8vdc39 1 J2 Antenna40 1 L1 5.6 uH41 1 L11 4T/FT37-4342 1 L12 10T/T37-643 1 L13 12T/T37-644 2 L2,L3 18T/T37-645 1 L4 100uH46 1 L5 6.9uH47 1 L6 1mH48 2 L7,L9 8.2uH49 2 L8,L10 3.9uH50 2 M1,M2 ADE-151 1 Pot1 1K Audio Taper52 1 Pot2 20K-10T53 1 Pot3 10K Audio Taper54 14 Q1,Q3,Q4,Q5,Q7,Q10,Q11,Q12,Q13,Q14,Q15,Q18,Q19,Q20 PN222255 1 Q16 J17656 1 Q17 2N2907

57 1 Q2 2N412458 1 Q21 2N2222A59 1 Q22 2SC216660 1 Q6 2N700061 2 Q8,Q9 MPSH1062 5 R1,R12,R27,R56,R58 47K63 5 R10,R43,R55,R82,R88 5164 3 R11,R50,R77 27065 1 R13 5.6K66 6 R14,R22,R45,R51,R64,R78 10K67 1 R15 1.8K68 5 R16,R48,R67,R85,POT1 1K69 1 R18 4770 5 R19,R36,R49,R53,R80 10071 4 R2,R37,R66,R73 4.7K72 1 R20 20K73 2 R23,R24 27K74 3 R25,R26,R39 1.5K75 1 R28 4376 4 R29,R32,R33,R86 1077 1 R3 3.9K78 1 R34 13079 3 R4,R35,R41 5680 1 R42 3381 1 R44 33K82 3 R46,R61,R62 2.7K83 8 R5,R21,R30,R38,R40,R47,R83,R89 2784 2 R52,R79 2.2K85 2 R54,R81 82086 2 R57,R59 22087 3 R6,R17,R31 3.3K88 1 R60 18089 1 R63 2.2M90 1 R65 1M91 1 R68 9192 1 R69 12093 2 R7,R8 1694 2 R70,R72 6.895 2 R71,R75 15096 2 R74,R76 15K97 1 R84 4.3K98 1 R87 1599 1 R9 68

100 1 S1 Part of pot3101 1 SP1 SPEAKER102 1 T1 1:4:11T/FT37-43103 1 T10 20TP-3TS/T37-6104 1 T11 9TP-2TS/FT37-43105 1 T2 16:3:1/FT37-61106 1 T3 8TBifilar/FT37-43107 2 T4,T5 9TP-3TS/BN2402108 1 T6 17TP-5TS/T37-2109 1 T7 10T-Trifilar/FT37-43110 1 T8 1200CT - 8111 1 T9 2TP-20TS/T37-6112 3 TC1,TC2,TC3 5-50 pF113 1 TC4 3-30pF114 6 TC5,TC6,TC7,TC8,TC9,TC10 5-50pF115 1 TR1 50

116 8 Y1,Y2,Y3,Y4,Y5,Y6,Y7,Y8 11.0MHz