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Re: VHF power amplifier with low third armonic?



Put your diplexer in as a hi-pass filter between your UHF antenna and preamp 
and I think you'll see better results. Lots of problems of this type are 
caused more by fundamental overload than by third harmonics. Good Luck.

73, Drew KO4MA

----- Original Message ----- 
From: ""Fernandez Montaña, Juan Antonio"" <jafernandez@iberdrola.es>
To: <amsat-bb@AMSAT.Org>
Sent: Monday, August 07, 2006 7:31 AM
Subject: [amsat-bb] VHF power amplifier with low third armonic?


> Hi all!
>
> I have tried running some VHF power amplifiers over 100/150 Watios 
> attached
> to my TS-790 and all of them gave interference problems to receive the
> downlink in UHF.
>
> I even tried connecting a duplexer VHF/UHF in the p.a. output, in the arm 
> of
> UHF over a 50 ohmios load, and it reduced a bit the problem but it didn't
> desapear completly.
>
> If anybody is running a VHF power amplifier over 100/150 watios and you
> don't have problems in your UHF reception, I would apreciate that you send
> your experience and tricks to ea4cyq@amsat.org
>
> Thank you very much
> Juan Antonio
> EA4CYQ
> 73s
>
>
>
>
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