[amsat-bb] Re: Question re rx/tx relays and diplexer

Nigel Gunn G8IFF/W8IFF nigel at ngunn.net
Sun Dec 7 10:43:38 PST 2008

Curt Nixon wrote:

> Do commercial coaxial relays for t/r use short the rx line when in tx? 
> or do they leave it float?

No. I would recommend that you use a second low power relay to put 50R loads across both in and out of your preamp.
> Also, should the 2M output on the diplexer for desense be terminated? or 
> left open.

I think most people leave it open but personally, I would terminate it with a 50R resistor.

Nigel A. Gunn. G8IFF   W8IFF (have also held KC8NHF, M0NHF, 9H3GN)
1865 El Camino Drive, Xenia, OH 45385-1115, USA   937 825 5032
e-mail nigel at ngunn.net             www  http://www.ngunn.net
Member of  ARRL, GQRP #11396, QRPARCI #11644, SOC #548,  Flying Pig #385,
                   Dayton ARA #2128,  AMSAT-NA   LM-1691,  AMSAT-UK, MKARS,  ALC

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