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Re: [TowerTalk] remote switching for balanced lines

To: Gary Slagel <>
Subject: Re: [TowerTalk] remote switching for balanced lines
From: Jim Lux <>
Date: Fri, 11 Apr 2008 13:50:29 -0700
List-post: <">>
Gary Slagel wrote:
> Anyone have any ideas on how to remotely switch
> balanced lines.  The idea being to have 2
> dipoles/doublets on a tower with one balanced feedline
> running to the shack and be able to switch the
> feedline from one antenna to the other at the tower. 

Assuming you want to fabricate something:

Double pole double throw relay, coil operated by DC carried on the 
feedline, decoupled with a choke.

Use any of the relays that folks use in antenna switch boxes that are 
available in DPDT configurations..

If you want something off the shelf, it's going to be a bit trickier. 
You could modify something like an MFJ RCS-8V pretty easily by cutting a 
couple traces.  The relays in that are basically SPST switches, so you'd 
use 4 of the 5 to do your switching.

Jim, W6RMK

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