Hey Jeff,
I use only tuned stubs for SO2R with my Six Pak. I don't have any other
filtering. I connect the stubs on the antenna side coax connectors on the Six
Pak with one or more T connectors. There is 75' of coax between the Six Pak
switch box and the stations. It seems to work reasonably well. There is a
little interstation interference, but most of that is just on harmonic
frequencies, so it is manageable. Make sure your stubs are cut well as N3RR
mentioned. Mine were cut by W2JVN. Also, make sure that the T connectors are
high quality. I had initially used some cheap Chinese T connectors that came
apart under the strain of the stubs pulling on them. In one case, a T connector
developed an intermittent that allowed increased interference. All replaced by
Amphenols now.
73,
Will AA4NC
From: Jeff Clarke <ku8e@bellsouth.net<mailto:ku8e@bellsouth.net>>
To: cq-contest@contesting.com<mailto:cq-contest@contesting.com>
Subject: [CQ-Contest] Coax Stubs for SO2R
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Wondering how those of you using a Six Pack antenna switch hookup your stubs? I
have two coax cables from the Six Pack coming into the shack going to each
radio. Each station has a multi band Dunestar switchable filter. For the most
part the Dunestar works well but since I recently added an KPA500 to my run
station, when I'm on 40 meters with the amp it gets into 20 meters on station
#2 pretty bad. Are you all using a T connector and have the stubs for each band
on a manual multi position antenna switch?
Also does anyone know if the Dunestar's are tuned for a specific part of the
band. On 80 meters mine seems to have a very high SWR when I switch it in even
though the SWR on the KPA500 looks good.
Jeff
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