Thanks for the post, Paul. If you have any pics of that Omni VII mod,
please send them along to me. And Ron......NO need for any defense on your
part. A perfectly reasonable expectation.
73 John K4NP
----- Original Message -----
From: "Paul Christensen" <email@example.com>
To: "Discussion of Ten-Tec Equipment" <firstname.lastname@example.org>
Sent: Sunday, December 09, 2007 9:18 AM
Subject: Re: [TenTec] OMNI VII QSK users with good ears....
>> I'm trying to think of a modern Ten-Tec radio that doesn't use a relay
>> T/R switching, and can't think of one!
> Their reed relays are plenty fast enough and I see no real benefit over
> diode switching except for longevity. Still, few relays fail in these
> even after 20+ years.
> I did replace the T/R relay in my Omni VII with a Matsushita/Aromat RS-12D
> reed relay, made specifically for RF switching. While the stock Omni VII
> relay is reasonably quiet, it's possible to take the slight ticking noise
> zero with the RS-12D.
> Ten Tec used an ingenious scheme to isolate the T/R relay. They mounted
> on a very small PCB and cushioned it with foam. I took their idea a step
> further and replaced the solid conductor wire with ultra-fine strand,
> silicone jacketed wire from a robotics company.
> The new wire is super flexible and does not acoustically transmit the
> armature noise back to the PCB. Totally silent QSK now even when placing
> the ear on the cabinet.
> Paul, W9AC
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