[amsat-bb] Re: 70cm preamp

Andrew Glasbrenner glasbrenner at mindspring.com
Wed Sep 27 16:39:02 PDT 2006


73, Drew KO4MA
LM 2332

----- Original Message ----- 
From: "Bill Bruno" <billbruno at earthlink.net>
To: "Amsat BB" <amsat-bb at amsat.org>
Sent: Wednesday, September 27, 2006 7:04 PM
Subject: [amsat-bb] 70cm preamp

> On my V/U setup I have a SP7000 70cm preamp. Working FO29(JAS2) my 2 meter
> signal overloads the preamp, my signal splattering like an adjacent strong
> station. With preamp off the problem is not there. In testing I found the
> overload happens in any combination of 70cm 2m frequency pairs. I can
> eliminate the problem by lowering the tx power, but by doing so I have a
> hard time copying my own signal. How can I eliminate the 2m sig 
> overloading
> the preamp while still maintaining  adequate power?
> Antennas m2 436cp30,  Gulf Alpha 2m5el, both right hand polarization.
> I could use some suggestions.
> Thanks Bill
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