500 KHz RF Driver Amplifier (W5JGV).pdf

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500 KHz RF Driver Amplifier
by W5JGV
2 Dec 2008
+ 41 V
4700 uF
50 V
+
.05
200 V
120 k
T1
470
330
RF Drive to
G1 of 4-400A
amplifier
20 k
Bias
33 k
RF Input from
Starpoint Modem
.0022
200 v
150 k
680
6800
10-250
.0022
200 V
2N5089
5100
3300
680
.02
200 V
2.5 k
RF Gain
IRF730
39 k
E
B
C
G D S
T1 - Pri = 18 turns 7 x #24 enameled twisted together
Sec = 50 turns 24 from CAT-5 cable
Core - T-200-26.
Adjust bias on IRF730 for minimum crossover distortion on RF Grid drive.
RF Input max = 1.75 V peak = 1.24 V RMS = 31 mW @50 Ohms
Amplifier is Class-A. Power output approximately 5 watts.

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