Tom's concern about the components in the tank circuit is entirely
well-founded. The peak currents and voltages are related to those at the
input and output in some proportion to the Q of the matching circuit. (I
don't remember the exact formula.) Remember that an L-C matching circuit
works by juggling the energy between reactive components; sometimes more I
and sometimes more V as the change is made.
If you have 1 Amp of plate RF, you might have a whole lot more amps
somewhere in the tank circuit. I've seen capacitors unsolder themselves,
just from the high circulating currents. Voltages do similar nasty
tricks.
By the way, if you know someone with a busted HF2V, there were some
serious 250pF doorknobs on that that could be salvaged.
73, Ward N0AX
--
FAQ on WWW: http://www.contesting.com/topband.html
Submissions: topband@contesting.com
Administrative requests: topband-REQUEST@contesting.com
Problems: owner-topband@contesting.com
Sponsored by: Akorn Access, Inc. & N4VJ / K4AAA
|