Eastern VHF Conf. 4/2006 W2SZ/1 (The MGEF) R. L. Frey - WA2AAU 70 Watts CHEAP !! On 2304 MHz 70 WattsCHEAP !! On 2304 Modifying A 1900 MHz PCS Amplifier

R. L. Frey - WA2AAU 70 Watts CHEAP !! On 2304 MHz Eastern VHF Conf. 4/2006

W2SZ/1 (The MGEF)70 Watts CHEAP !!

On 2304Modifying A

1900 MHzPCS Amplifier

R. L. Frey – WA2AAUEastern VHF/UHF

ConferenceApril 22, 2006


W2SZ/1 (The MGEF)

1900 MHz PCS Amplifier

Lots of Them In Use

Some Now Surplus…

• Wouldn’t It Be Nice If We Could USE THEM???

• Surprise!! WE CAN!!


W2SZ/1 (The MGEF)

The AML PCS Amplifier


W2SZ/1 (The MGEF)



W2SZ/1 (The MGEF)



W2SZ/1 (The MGEF)

The AML PCS AmplifierRF Amplifier Base Plate


W2SZ/1 (The MGEF)

DiodeAttenuator

AnarenXinger

DirectionalCoupler

1A1305-10

Mini-CircuitsERA-6

RF Micro-Devices

RF2125P

KFF6358ABandpass

Filter

EricssonPTH 32003

PA

Mini-CircuitsERA-6

AML PCS Power Amplifier - Driver StagesModel No. S80PCSA Part No. 1000103P1 Rev. 4

SMA

Input

To Power ControlCircuitry

To MRF19125

High PowerPA Stage

RLF2/27/2006

DrvrBlk2.cdd

25 W

24 dB

1 W

14 dB

-10 dB17.9 dBm

12.2 dB12.2 dB

17.9 dBm Max. Power Out (P1)For Each Part

Stage Gain

Sample


W2SZ/1 (The MGEF)

Notes: Unless Otherwise Labeled,Decimal values of capacitance are in uf.Whole number capacitances are in pf.Resistances are in ohms; k=1000.All Resistors are chip resistorsA = A-Sized ATC Capacitor or equiv. B = B-sized ATC Capacitor or equiv.Other resistors and capacitors labeled by industry-standard size.

Reflected PowerProtection Circuit

MRF19125

MRF19125

16

16

16

16

0.01

0.01

0.1

0.1

16

16

160.01

0.01

0.1

0.1

100 uf

100 uf

+

+

80.6

80.6

+

+

100 uf

100 uf

56

56

+26VDC

+26VDC

RF Out

RF In

50

8w

2A1305-3-R

2A1305-3-R3dB 3dB

Q1

Q2

Q1 Bias

Q2 Bias

30 dBCoup. 1 Coup. 2

Coup.3 51-1W

094-039038-006

Isolator

M2 GlobalY1

50

40w

Forward PowerSample To

Control Board

1A1305-30

Anaren

Anaren Anaren

B

B

B B B

B B B

A

A

A

16A

08050805

0805

1206

120608050805

1206

1206

0805

Type N

C1

C2

C3C4C5

C6

C7 C8 C9 C10

C11

C12

C13C14C15

C16

C17 C18 C19 C20

R1

R3

R2

R4

R5

R6

R7

AML PCS Power Amplifier - Final Stage

Model No. S80PCSA Part No. 1000103P1 Rev. 4

Drawn From InspectionR. L. Frey - May 10, 2005


W2SZ/1 (The MGEF)


W2SZ/1 (The MGEF)

MRF19125 Transistor


W2SZ/1 (The MGEF)

MRF19125 Transistor


W2SZ/1 (The MGEF)

MRF19125 Transistor


W2SZ/1 (The MGEF)

Ericsson PTH32003

It’s A DUD!


W2SZ/1 (The MGEF)

Ericsson PTH 32003


W2SZ/1 (The MGEF)

Ericsson PTH 32003

• Lots of internal matching stuff

• Not likely it can be made to work by matching it externally

• Sadly, this part won’t work for us

• We could have used a driver!!


W2SZ/1 (The MGEF)

AML Amplifier Mounted to Heat Sink with Fans for Testing


W2SZ/1 (The MGEF)

Rhode & SchwarzSMIQ 03B

Signal Generator

Hughes 1177 TWTA

HP432

HP435

-22-20

10 dB20 dB

12V Fan PS 5V Bias PS

10 dB

-30

HP435

+26 VDC

Ground

+-

In OutAML PCS PA

Heat Sink+ 4 Fans

3043B-30Directional

Coupler

HP 777DDual Directional Coupler

OutputPowerMeter

DrivePower.

ReturnLoss

DCAmmeter0 - 50 A

RG-214/U

Bird 8135150-W LoadSorensen

DCR 40-70B0 - 40 Volt

0 - 70 AmpereRegulated Power Supply

Narda

E & M LabsCirculator

40 WLoad

Narda3043-30

20 dB

HP8563ESpectrumAnalyzer

Test Jig For 1900 MHz AML Amplifiers

0-10 Watts Drive Power

R. L. Frey4/24/2005


W2SZ/1 (The MGEF)


W2SZ/1 (The MGEF)


W2SZ/1 (The MGEF)

AML Amp Operating on Original Frequency of 1975 MHz

0

20

40

60

80

100

120

0 1 2 3 4 5 6 7 8 9 10

Drive Power (Watts)

Ou

tpu

t P

ow

er (

Wat

ts)

& E

ffic

ien

cy (

%)

0.0

2.0

4.0

6.0

8.0

10.0

12.0

Gain

(dB

)

Power Out

Efficiency

Gain

R. L. Frey4/24/2005


W2SZ/1 (The MGEF)

Copper Coaxial Cable Connections To Test Single Transistor


W2SZ/1 (The MGEF)

Top Transistor of AML Amplifier Operating on Original Frequency of 1975 MHz

0

20

40

60

80

100

120

0 1 2 3 4 5 6 7 8 9 10

Drive Power (Watts)

Ou

tpu

t P

ow

er (

Wat

ts)

& E

ffic

ien

cy (

%)

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

11.0

12.0

13.0

14.0 Gain

(dB

)

Power Out

Efficiency

Gain

R. L. Frey4/26/2005


W2SZ/1 (The MGEF)

AML Amplifier Performance at Original Freq. (1 Transistor)

• Power Output = 100 Watts

• Drive Power = 6.61 Watts

• Power Gain = 12.0 dB

• Input Return Loss = 6.9 dB pew!

• Power Supply = 26.3 Volts

• Current Draw = 8.5 Amps

• Efficiency = 44.7% …


W2SZ/1 (The MGEF)

Original Input and Output Matching of Power Transistor


W2SZ/1 (The MGEF)

0.36

0.20

0.5

0.20

Original Design

Modified for 2304 MHz

Input Microstrip Matching Network

Bridge Gaps WithCopper Foil

R. L. Frey3/1/2006

(Second Pad Back From Power Transistor)

0.64

0.11

Add Two PatchesOf Copper Foil

All Dimensions are in Inches


W2SZ/1 (The MGEF)

Input Match Modified For 2304 MHz


W2SZ/1 (The MGEF)

0.477”

0.555”

0.160”

0.600”0.035”

0.035”

0.035”

Etc

Etc

0.25”0.25”

0.025”

R. L. Frey3/1/2006

Ed

ge

Of T

ran

sist

or

Bo

dy

0.737”

0.063”

0.220”

Original Output Matching Circuit

Tuning StripsNot Connected


W2SZ/1 (The MGEF)

0.340”

0.555”

0.160”

0.600”0.035”

0.035”

0.035”

Etc

Etc

0.25”0.25”

0.10” 0.025”

0.20”

R. L. Frey3/1/2006

0.050”

0.18”

0.100”

0.200”

0.730”

0.080”

0.25”

Tunable Foil FlappersBend Up & Down

For Best Power Output

FoilTape

SolderedIn

Place

Ed

ge

of T

ran

sist

or

Ca

se

Output Matching CircuitModified for 2304 MHz


W2SZ/1 (The MGEF)

Photo of Output Matching Circuit Modified for 2304 MHz


W2SZ/1 (The MGEF)

Top Transistor of AML Amplifier Retuned to 2304 MHz

0

20

40

60

80

100

120

0 1 2 3 4 5 6 7

Drive Power (Watts)

Ou

tpu

t P

ow

er (

Wat

ts)

& E

ffic

ien

cy (

%)

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

11.0

12.0

13.0

14.0 Gain

(dB

)

Power Out

Efficiency

Gain

R. L. Frey5/8/2005

VDD= 26.3 Volts


W2SZ/1 (The MGEF)

Performance at 2304 MHz• Power Output = 79 Watts



• Input Return Loss = 21.4 dB



• Efficiency = 32% … - Not Great But We Do Have 79 Watts!


W2SZ/1 (The MGEF)

Top Transistor of AML Amplifier Retuned to 2304 MHz

0

10

20

30

40

50

0 1 2 3 4 5 6 7 8

Drive Power (Watts)

Ou

tpu

t P

ow

er (

Wat

ts)

& E

ffic

ien

cy (

%)

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

11.0

12.0

Gain

(dB

)

Power Out

Efficiency

Gain

R. L. Frey5/8/2005

VDD= 13.8 VDCIDQ = 1.35 A


W2SZ/1 (The MGEF)

Performance at 2304 MHz With VDD = 13.8 Volts DC• Power Output = 20 Watts



• Input Return Loss = 19.7 dB



• Efficiency = 27% … - Poor, But We Do Have 20-30 W. at 13.8 V And it is a 26-Volt Transistor!!


W2SZ/1 (The MGEF)

AnarenXinger

DirectionalCoupler

1A1305-10

RF Micro-Devices

RF2125P

Mini-CircuitsERA-6

AML PCS Power Amplifier On 2304 MHzModel No. S80PCSA Part No. 1000103P1 Rev. 4

SMA

Input

MotorolaMRF19125

RLF3/2/2006

HiGain1.cdd

10 dB

-10 dB

11.5 dB

17dBm

Stage Gain

Sample

Mini-CircuitsERA-6

11.5 dB

80 W

7 W27 dBm(1/2 W)

5.5 dBm-6 dBm-5 dBm

11.7 dB 10.6 dB

-30 dBSample

75 W

MotorolaMRF19125

10V Reg 10V Reg 10V Reg 13.6 VDC 26 VDC

AnarenXinger

DirectionalCoupler

1A1305-30RF

OUT

TypeN

0.3 mW (6V DC) (5.2V DC)(5.2V DC)

Bias Bias5V Reg 5V Reg


W2SZ/1 (The MGEF)

Predicted Performance of the Suggested Cascade of Stages

• Power Output = 70-80 Watts

• Drive Power ~~ 0.3 Milliwatts

• Power Gain > 50 dB watch out

• Power Supply = 26.3 V @ 9.4 A And 13.8 V at about 5 amps


W2SZ/1 (The MGEF)

Conclusions

• Very Useful Building Block

• Requires Some Work to Use It

• Efficiency Only Fair, but Typical

• Absolutely Needs Big Heatsink!!

• Will Deliver 25-30 W at 13.8 V• Low Level Driver Design Still Needed

• My First Try on 1296 MHz

Did NOT Work


W2SZ/1 (The MGEF)

More Information At:• Detailed information in living

color is available at:http://www.mgef.org/amps/index.html

And

http://www.wa1hco.net/PCS_index.html

• To Obtain an Amplifier Contact R. L Frey – WA2AAU at E-mail:

[email protected]

Documents

Eastern VHF Conf. 4/2006 W2SZ/1 (The MGEF) R. L. Frey - WA2AAU 70 Watts CHEAP !! On 2304 MHz 70 WattsCHEAP !! On 2304 Modifying A 1900 MHz PCS Amplifier