[CQ-Contest] Coax Stubs for SO2R

[Jeff Clarke]

   Will  and  others  who  suggested putting the stub at the antenna side
   connectors of your Six Packs.... Are your switch boxes at the top or bottom
   of your tower or inside the shack? The stubs are actually on your towers?

   My box isn't on a tower. It's mounted on post in the woods where my antennas
   are, maybe 75 to 100 feet away from my shack. The SO239's for each band on a
   Six Pack seem to be pretty close together on the box. You are able to fit a
   T-connector and a stub on one of those SO239 positions despite that?

   Jeff

   On Sep 9, 2015 1:08 PM, "Roberts, Will" <Will.Roberts at duke-energy.com>
   wrote:

   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 <[1]ku8e at bellsouth.net>

   To: [2]cq-contest at contesting.com

   Subject: [CQ-Contest] Coax Stubs for SO2R

   Message-ID: <[3]56109.69958.bm at smtp220.mail.gq1.yahoo.com>

   Content-Type: text/plain; charset=utf-8


   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

References

   1. mailto:ku8e at bellsouth.net
   2. mailto:cq-contest at contesting.com
   3. mailto:56109.69958.bm at smtp220.mail.gq1.yahoo.com