[TenTec] OMNI VII QSK users with good ears....

[fraz1]

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" <w9ac at arrl.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
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 
>> for
>> T/R switching, and can't think of one!
>
> Their reed relays are plenty fast enough and I see no real benefit over 
> PIN
> diode switching except for longevity.  Still, few relays fail in these 
> rigs
> 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 
> to
> zero with the RS-12D.
>
> Ten Tec used an ingenious scheme to isolate the T/R relay.  They mounted 
> it
> 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.
>
> http://www.trossenrobotics.com/store/p/5224-22AWG-High-Strand-Count-Silicone-Wire-Combo-Pack-25-ft-.aspx
>
> 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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