Topband: Fwd: Re: [CQ-Contest] Receive antenna switch

[Herbert Schoenbohm]

-------- Forwarded Message --------
Subject: 	Re: [CQ-Contest] Receive antenna switch
Date: 	Wed, 14 Jan 2015 12:56:00 -0400
From: 	Herbert Schoenbohm <herbs at vitelcom.net>
To: 	cq-contest at 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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