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Re: [TowerTalk] Budget 4-Pack?

To: Gregory Fischer <>
Subject: Re: [TowerTalk] Budget 4-Pack?
From: jimlux <>
Reply-to: "Tower and HF antenna construction topics." <>
Date: Tue, 02 Mar 2010 21:12:26 -0800
List-post: <">>
Gregory Fischer wrote:
> Take a look at this solution.  Less expensive and provides the lockout 
> from the control unit.

I'm not so wild about that design.  If a relay fails closed/stuck, you 
can short one radio to the other by closing another relay, and there's 
no failsafe mechanism to provide feedback to the controller.

say RLYA-2 fails stuck closed.  When you turn on RLYB-2, radio A is 
connected to radio B.

if those are actually SPDT relays, you do much better by using arranging 
them differently.

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