-------- Forwarded Message --------
Subject: Re: [CQ-Contest] Receive antenna switch
Date: Wed, 14 Jan 2015 12:56:00 -0400
From: Herbert Schoenbohm <herbs@vitelcom.net>
To: cq-contest@contesting.com
I use here a retired Dynair 12X1 passive video switcher. One nice
feature is that each unused RG-6 cable which runs to reversible two wire
Beverages is terminated. With feed line length equal to 1/2 wave
(includes the cable velocity factor.) the 75 ohm termination appears at
the unused port at the feed box. The only down side is that the push
buttons move a connection on a long bus inside and take a finger
pressure. It would be great if someone would market a desk top remote
with momentary light touch switch or with a computer interface. I have
several Ameritron 8X1 along with the RCS 12 but that only gives me 8
positions. it also does not terminate the unused ports. The
DX-Engineering 8X1, (RR-8B) which can be driven by the desktop RCS-12
has provisions for unused port termination, but to use a 5KW switch for
a bunch of Beverages seems a git of a over-kill. Hopefully something
will be on the market soon as there seems top be a need for something
that will control many Beverage inputs.
Herb Schoenbohm, KV4FZ
On 1/13/2015 4:31 PM, Tom Osborne wrote:
HI All
I would like to build a switch to switch in a receive antenna as my
radio doesn't have a receive antenna port. I'd like to build a
beverage for low band contesting. I have some 12 volt relays, but am
afraid the switching time would be too slow.
What would be a source of good, quick switching relays? Thanks and 73.
Tom W7WHY
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