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Re: [TowerTalk] Fw: six pack relays

To: "Towertalk Reflector" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Fw: six pack relays
From: "Dave Hachadorian" <K6LL@ARRL.net>
Date: Fri, 1 Jan 2010 19:37:37 -0000
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I never had a relay problem with my Six-Pak using a full
regulated 13.8 vdc drive.

When I added some steering diodes into the relay selection
logic to do some specialized switching, the relays would no
longer pull in reliably. I had to change those diodes to
1N5818 Schottky Diodes to reduce the forward voltage drop.

While I was at it, I also changed CR13 (reverse voltage
protection diode) in the Six Pak to a 1N5818. You pick up about
0.5 volt for all the relays with that one change. There have been
no problems since then. 1N5818's are available from Mouser for
$0.07. They are handy to have on hand for this type of
application.

Dave Hachadorian, K6LL
Yuma, AZ


































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