Power Amplifier Projects

for Experienced VHF/UHF PA Builders

Important notes:

All connections between RF parts, and also connections to ground MUST BE as short as possible! This is VHF, not HF, in spite that designs may looks like HF! Hi! See mechanical layout of PA designs below!

If input circuit trimmers, need to be at maximum or minimum capacity during adjusting, it is necessary to change the length of the cable between the exciter and the amplifier itself. The optimal length of the cable should be determined experimentally to obtain adjustment with approximately the calculated values of capacitances. This experimentally determined cable should always be used when operating the amplifier. A change of exciter could occasionally require a new length of cable to be determined.

NEW !

20 kW VHF Power Amplifier

1 x GU36B-1

initial and final design:

Built by: Miška, YU7MS and Pali, YU7PS

RX1AS QRO PA Pictures

Sergei Spiridonov, RX1AS

NEW !

5 kW VHF Power Amplifier

Calculated, simulated and optimized using new, recently developed

YU1AW Dynamic Tube Model

PANICK V

2 x 3CPX1500A7

PANICK V.zip (11 MB)

Built by: Nick, HB9EFK and Enrico, HB9SV

Measurements on finished PA:

http://www.youtube.com/watch?v=f2wEQdIh1vQ

NEW !

VHF 2-Bander

6m and 2m PA

2B-1PA

1xGU84B

Calculated, simulated and optimized using new, recently developed

YU1AW Dynamic Tube Model

Schem. Diag. Mech. Layout Plate Circuit In&Out Isolation Crossover Isolation

GU84B 2B-1PA DATA

Gain (S21) Power Efficiency Input SWR Voltages

6m:

2m:

Download .ZIP file (580kB)

NEW !

VHF 2-Bander

6m and 2m PA

2B-1PA

1xGU74B

Calculated, simulated and optimized using new, recently developed

YU1AW Dynamic Tube Model

Schem. Diag. Mech. Layout Plate Circuit In&Out Isolation Crossover Isolation

GU74B 2B-1PA DATA

Gain (S21) Power Efficiency Input SWR Voltages

6m:

2m:

Download .ZIP file (585kB)

NEW !

VHF/UHF 3-Bander

6m, 2m and 70cm PA

3B-1PA

1xGS31B

Calculated, simulated and optimized using new, recently developed

YU1AW Dynamic Tube Model

Schem. Diag. Mech. Layout Plate Line Input Isolation Output Isolation

Gain (S21) Power Efficiency Input SWR Voltages

6m:

2m:

70cm:

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