[amsat-bb] Re: SSB 70cm Pre AMp

[Art McBride]

Peter,
Signal from your transmitter is de-sensing your preamp. It could be 2 Meter,
white noise, or 3 harmonic. The third harmonic could come from the
transmitter or it could be made by corrosion on the antenna connections. 
I suggest you check all elements and their connections including the antenna
connectors first. Next step is to make or by filters or try a diplexer. If
you make your own filters start with the RSGB VHF/UHF Manual I has great
ideas and practical information for construction of all types of electronics
including filters. 

Art,
KC6UQH

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Peter Wilson
Sent: Sunday, April 11, 2010 10:51 AM
To: Amsat BB
Subject: [amsat-bb] SSB 70cm Pre AMp

Hi Everyone,

Just set up my station and started to receive all the main satellites, using
a Gulf satellite antenna (2M + 70cm) + SSB 70cm Preamp and FT736R

When I transmit on 2M, especially FM, it's as if the preamp is squelching -
the receive signal reduces significantly. If I turn the preamp off I don't
get the problem, I can continue to hear the received signal.

Any ideas?

Peter Wilson
G8KEK
AMSAT UK 6897
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