Sorry about that, last amplifier in this freq range I built had the
pi network for 500 ohms at the anode, so I remembered using 20,000 pF
or something in that range. Rich is correct that for a 2K-3K plate
load, the blocker can be smaller in value. Also the current through
your cap is probably lower than the 40 Amps of plate current I was
using.
Goodluck Lynn, look for something else. give it time and maybe smoke
will eminate from your problem.
John
K5PRO
>Sounds like output coupling is not happening, if grid current is
> >higher on 160 and output is lower. Calculate the reactance of your
>>blocker capacitor, for one thing. I get about 49 ohms at 1.8 MHz,
>>which is excessive.
>
>** In a 2000-ohms or so circuit, 49 reactive ohms is hardly significant,
>John.
>
>>One ususally sees about 10 x this value of
>>capacitance as an anode blocker for high power at 1-2 MHz.
>>
>>73
>>K5PRO
> >John
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