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Posted by Watson A.Name - \"Watt Sun, th on September 8, 2004, 10:35 am
 

sensitivity

carries

without a

miserably in

I've never heard of one tower supporting multiple AM stations, because
the tower is the actual antenna; for more than one station, it means
they would have to have some kind of isolation between the two
transmitters to keep them from each other.  This leads me to beliwve
that maybe you're not really receiving that many stations on that tower.
Maybe you're getting interference from more than one station at that
location by intermodulation, where the station is acting like a local
oscillator in your radio, and causing it to receive two at the same
time.



"Check"

listening to


Posted by Jay Hennigan on September 28, 2004, 12:25 am
 
On Wed, 08 Sep 2004 03:35:59 -0700, Watson A.Name - "Watt Sun, the Dark
Remover" wrote:


It is quite common.  Typically separate transmitters and a matching
circuit called a diplexer.  Another technique is a singler broadband
power amplifier being driven by separate exciters for the different
frequencies.  The matching circuits are somewhat complex as the antenna
itself will be off-resonance for at least some if not all of the
frequencies in use.

http://beradio.com/departments/radio_diplexing_am_transmitters/

http://www.crawfordbroadcasting.com/~cbc/Eng_Files/Practical%20Diplexing.pdf


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