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Re: [VHFcontesting] Multi-pole relays with 28V common??

To: "John D'Ausilio" <jdausilio@gmail.com>, "(Radio) VHF Contesting" <VHFcontesting@contesting.com>
Subject: Re: [VHFcontesting] Multi-pole relays with 28V common??
From: David Olean <k1whs@metrocast.net>
Date: Thu, 7 May 2020 23:49:13 -0500
List-post: <mailto:vhfcontesting@contesting.com>
It might be defective.  I had an SMA relay like that. As soon as the case was grounded it would short out!

Dave K1WHS

On 5/7/2020 6:17 PM, John D'Ausilio wrote:
I've had a pair of 1P3T SMA latching relays in my relay box for a while,
and thought I'd use them for a 144/222/432 switching box for my K3. They
have one terminal marked +28V(COM) and three terminals marked -1, -2, and
-3. For some reason, the +28(COM) terminal is actually at RF ground, which
I realized when I connected system ground to the chassis! I see in various
catalogs that these relays are offered with negative or positive common ..
how the heck can you actually use a positive common relay without having
the chassis at +28?

Dynatech M3-413D38FT

de w1rt/john
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