[TowerTalk] 4-Square Configurations

[K3BU@aol.com]

In a message dated 8/14/2000 5:26:12 PM Eastern Daylight Time, i4jmy@iol.it 
writes:

> 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.

This was explainend by one who was there, actually he predicted that before 
the contest!

>  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.
>  

What's the difference between amplifiers with insufficient port filtering and 
through antennas coupling to each other?  Not much. 

Yuri, S561C



--
FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com