[Amps] new amplifier results

[John T. M. Lyles]

Is Heath Robinson the UK's version of Rube Goldberg here in the states?

>Worked, but always seemed a bit Heath Robinson to me......
>73
>Peter G3RZP


I am testing a new RF PA, this one using the THALES TH781 (former 
Thomson) tetrode:
Here are some of yesterdays results. Today am making linearity tests, 
both amplitude and phase. Its running at 200 MHz, in class AB2. The 
output is pulsed, about 10% on time, 0.9 mS long pulses.

>Ea=14.1kVDC, Ia=21 A pk
>Eg2=1500, Ig2=700 mA pk
>Eg1=-300, Ig1=180 mA pk
>Pout=157 kW, Pin=6.3 kW
n=53.2% (not PAE), Gain=14 dB

It is a very sweet amplifier, stability is excellent. Now if I could 
like the anode power supply overcurrent problem.

Off to the Albuquerque hamfest tomorrow.

73
John
K5PRO