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Re: [TowerTalk] frequency determined antenna switch

To: "Towertalk" <towertalk@contesting.com>
Subject: Re: [TowerTalk] frequency determined antenna switch
From: "Tony Brock-Fisher" <barockteer@aol.com>
Date: Fri, 10 Sep 2010 18:31:38 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
There are multiple ways to do this. Many radios (Icom, and maybe others) output 
an analog voltage that tracks frequency bands. You can decode this with an 
analog level detector to drive relays. Top Ten makes (made?) relay boxes and 
decoders for this. 

Another approach is to use a computer logging program. Many of these (N1MM and 
others) can look at the radio's frequency and output the Top Ten code on the 
parallel port, which can be used to drive antenna relays. N1MM allows you to 
map the frequency to the antennas, even having multiple antennas per band which 
can be selected.

-Tony, K1KP
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