[TowerTalk] remote switching for balanced lines - homebrew plan

[Dan Hearn]

Is anyone interested in a relay actually built to switch open wire
transmission lines? It is DPDT with a wide ceramic cross arm supporting the
contact arms. The base is a ceramic block 3x3 1/2 inches. Coil is 110 VDC.
There is an additional SPST contact on it for whatever. Contacts and arms
are about an inch from the coil or any other metal on it. The ceramic base
plate is mounted on 2 standoffs to maintain  HV spacing from any metal it
might be mounted on. Will sell for $35 plus you pay shipping. 73, Dan, N5AR

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com]On Behalf Of Roger (K8RI)
Sent: Sunday, April 13, 2008 2:08 PM
To: n8de at thepoint.net
Cc: TowerTalk; Gary Slagel
Subject: Re: [TowerTalk] remote switching for balanced lines - homebrew
plan


n8de at thepoint.net wrote:
> Your balanced feedline can also serve as your control lines.
>
> With no voltage on the lines, one pair of wires is selected.
> With +V on the lines, one of the relays is energized
> With -V on the lines, the other relay is energized.
>
Just don't switch open frame relays carrying high voltage under load.
> Use good quality RFC on both sides of the line at the shack and
> antenna and you shouldn't have any problems.
>
RFC = RF Chokes? At least that's what it means to me.

73

Roger (K8RI)

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk