Except that TTD usually put back EMF diodes on the relay coils. I know the A-B
switch boxes have them. I'd bet the 6 switch does also.
Ken K6MR
________________________________
From: TowerTalk <towertalk-bounces@contesting.com> on behalf of Al Kozakiewicz
<akozak@hourglass.com>
Sent: Thursday, September 22, 2022 1:45:03 PM
To: towertalk@contesting.com <towertalk@contesting.com>
Subject: Re: [TowerTalk] Old Top Ten Devices Relay Switch Box
DX Engineering now owns TTD.
If they are just relays, the polarity doesn't matter. Whether you common +12V
and ground to select or ground the common and apply +12V to select doesn't
matter.
Al
AB2ZY
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Ed Goss
Sent: Thursday, September 22, 2022 4:39 PM
To: towertalk@contesting.com
Subject: [TowerTalk] Old Top Ten Devices Relay Switch Box
HI Folks,
I have a couple of old Top Ten Devices relay boxes; no model number or id
is visible on the box. They allow for switching up to 6 different antennas. I
do not have, and cannot find any information on the control heads for these
relay boxes. Markings on the relay box indicate that +12 volts is common, with
the desired relay switched by applying negative/ground. This is opposite of
all the other relay boxes I have used (Ameritron, DXE) where you apply +12
volts to select the desired relay.
Does anyone know of a control head that would work with these old relay
boxes? Thanks...
--Ed, N3CW--
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