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[TowerTalk] Remote RF coax switch utilizing DC on coax

To: towertalk@contesting.com
Subject: [TowerTalk] Remote RF coax switch utilizing DC on coax
From: "Rick Karlquist" <richard@karlquist.com>
Reply-to: richard@karlquist.com
Date: Fri, 21 Jan 2005 17:58:36 -0800 (PST)
List-post: <mailto:towertalk@contesting.com>
Several people have asked about my beverage switching scheme.
I send a different DC voltage down the coax for each antenna
and have a circuit at the end that detects the different
voltages with comparators and activates an RF relay to select
an antenna.  I have posted an article about it at:

http://www.n6rk.com/Comparator_RF_switch.pdf

Rick N6RK

_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

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