[TowerTalk] 4-Square Configurations

[Maurizio Panicara]

Crossmodulation induced in amplifiers by external signals has some rare
chance to occur when two or more different PAs are used.  The IMD products
remotely generated in other amplifiers are typical in FM broadcast and
anyway rare when the "modulating" signal reaches the other amplifier through
radiated waves and antenna.
More commonly, the "remoted" IMD distortion occurs in amplifiers connected
to multiplexed systems (single antenna for more transmitters) when the
filtering between multiplexer ports is insufficient.

73,
Mauri I4JMY




----- Original Message -----
From: <K3BU@aol.com>
To: <towertalk@contesting.com>
Sent: Monday, August 14, 2000 3:43 PM
Subject: Re: [TowerTalk] 4-Square Configurations

> There was interesting problem on 80m with one of S50 stations during the
> contest by using two antennas simultaneously fed - it created wide and
mushy,
> raspy signal. When I told them about it, the explanation turned out to be
> that two antennas were too close to each other, RF was coupling into the
PA
> stages and causing crossmod of the signals.
>
> Yuri



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