[TowerTalk] Relay Specs - Coax switch

[Keith Dutson]

Aha!  So you're the one who designed that monster.  When I saw it I knew it
had likely been designed by an RF engineer because the contacts are massive
and located very close to the PCB solder point.  Also, that is a neat trick
you used to connect dual contacts via copper strap.

Another interesting relay I have seen is the one used in WX0B's BOP box.  It
is a simple open frame type using copper straps instead of wires.

Keith NM5G

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Tom Rauch
Sent: Friday, April 01, 2005 5:48 AM
To: keith at dutson.net; TowerTalk at contesting.com
Subject: Re: [TowerTalk] Relay Specs - Coax switch

> Thanks for the tips.  I particularly like the design of
the RCS-8V box.
> Those are custom made relays from Relay Service Company.
I called wanting
> them to make some for me but the small quantity cost was
too high.  Looks
> like that design would handle well over the legal limit,
and VSWR through
> the unit is very low at 30MHz.

I actually made a prototype relay and sent it to RSC, and they copied it for
Ameritron for production. That was about
1983 or 1984. Hard to believe 20 years goes by so fast. The RCS8V is flat to
over 200 MHz using that relay and board layout.

If you call both DXE or Ameritron and order relays they use, it will save
you a great deal of grief picking a high isolation relay. DXE has a custom
relay that is HUGE. It'll handle 15kW, so it can actually take some kilowatt
hot switching or "no antenna" mistakes.

73 Tom

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