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1. [VHFcontesting] 222 mhz W6PO amplifier questions (score: 1): Author: mike repinski via VHFcontesting <vhfcontesting@contesting.com>; Date: Tue, 30 Dec 2014 20:39:47 -0500; I recently finished a 222 mhz amplifier. I get 1500 watts input and 200 watts out. Not very efficient :( Could anyone shed some light? Not very complicated, not sure if I am missing something? Mike _; /archives//html/VHFcontesting/2014-12/msg00041.html (6,961 bytes)
2. Re: [VHFcontesting] 222 mhz W6PO amplifier questions (score: 1): Author: Tom <k8tb@bosscher.org>; Date: Tue, 30 Dec 2014 21:41:05 -0500; Without any power, look at the return loss (swr) of the input. Use an antenna analyzer, connecting the input to the antenna port. Theoretically, you can do the same with the output circuitry, again,; /archives//html/VHFcontesting/2014-12/msg00042.html (7,994 bytes)
3. Re: [VHFcontesting] 222 mhz W6PO amplifier questions (score: 1): Author: David Pruett <k8cc@comcast.net>; Date: Tue, 30 Dec 2014 22:07:47 -0500; Mike, You might have the amplifier loaded too heavily. Try reducing the loading slightly (plate current will drop) then adjust the plate tuning to peak your power output (which should occur at the pl; /archives//html/VHFcontesting/2014-12/msg00043.html (8,997 bytes)

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