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Re: Interference problem RX/TX



Brian,
Most Satellite amateurs eliminate this problem by using diplexers for
2M/70cm combiner/ separators as filters. Also antennas, mast fitting's and
cables must be free of corrosion as Copper-Iron Oxide can act as a crude
diode. All solid state transmitters emit white noise approximately -60 dB
down from the carrier, and any signal over 0 dB at the amplifying device of
your Preamps will cause the interference you describe. You may need to do
some testing, any filters on the receive side must be before your Preempts,
transmitter filtering can be done at the shack.

Good Luck,
Art, KC6UQH
----- Original Message -----
From: "OZ1SKY Brian" <amsat-bb1@houge.spamfree.dk>
To: <amsat-bb@amsat.org>
Sent: Saturday, January 15, 2005 1:16 PM
Subject: [amsat-bb] Interference problem RX/TX


> Hello Everyone.
>
> Im having a problem here with TX interference in my RX when working
> satellite.
>
> My setup is ICOM910H with 9elem yagi for 2m and 16elem yagi for 70cm.
> Using SSB SP2000 preamps on both antennas.
> My problem is the TX makes alot of noice in my RX, when working over
4-5Watt
> output.
> Both ways, 2m up / 70cm down and 70cm up / 2m down.
> Only AO7 is working fine with more than 4-5watt output, its another
up/down
> config that dont add up with the harmonic freq.
>
> So, im looking for options, so i can run more output power, 4-5watt is not
> alot, when you dont have elevation rotors. Moving the antennas more apart
is
> not an option, nor is disconnection the preamps, then i cant hear very
good.
> So what am i looking at, filters?
>
> I cant be the only one with this problem, so maybe some you have some
> answers?
>
> Thanks
>
> Regards
> Brian OZ1SKY
> Denmark.
> ----
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----
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