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bands covered by the C31XR while transmitting high power on any other one. With the Dunestars in circuit apart from direct harmonic interference I only have some modulation of the noise floor to tolerate. Listening on one band while transmitting on another (both with the C31XR) works pretty well. Not perfect but well. Having satisfied myself that the C31 works usefully in SO2R with 3 feeders, I now plan to stack three of them fed with 3 feeders and 3 Stack Matches on 120ft of rotating tower and with a Magnum 340N at the top. I then plan to put my TH11 on the present tower for use as a mult antenna and to get me back on the WARC bands. I will leave the XM240 above the TH11 and at right angles to it. My overall plan is to achieve a good level of M/S & M/2 functionality here. I don't have the real estate to warrant spending any time thinking seriously about M/M. Incidentally, my Six Pack is in the shack. I chose to bring all of my coax cables directly into the shack and do my switching there. I felt that would give me maximum flexibility. I have stubs connected across my 160/80 and 40m antennas on the antenna side of the SixPack. In each case the stubs are only 6ft of cable away from the amp output sockets. A stub on the 20m feed to the C31XR would be a help on 10m but there is a complication. If I attach a stub directly across the 20m feed from the SixPack then my SWR on 15m is badly affected. I spoke to Tom Schiller about this but he seemed convinced I was mistaken! I'm not and with 100W power levels I have satisfied myself that the problem can be resolved adequately by putting a 20m bandpass filter on the antenna side of the stub. I haven't done this yet as I need a high power 20m bandpass filter. I will probably have to make one. The C31XR is a great antenna and I'm betting a stack of three will be even better. 73 Bob 5B4AGN, P3F, ZC4ZM ----- Original Message ----- From: "Bob Henderson" <bob@cytanet.com.cy> To: "Jack Brabham KZ5A" <kz5a@mindspring.com>; <Force12Talk@qth.com> Sent: Sunday, July 28, 2002 7:11 AM Subject: Re: [Force 12 Talk] C31XRs in SO2R ??? > Jack > > I am using that configuration here but with Dunestar filters. Works pretty > well. The W3NQN filter set is reputed to have better out of band rejection > than the Dunestars so they should work just fine. You'll need to set things > up so your band pass filters can't drop out of circuit though. If they do > then its very easy to toast the front end of your second radio! Trust me, > I'm writing from experience on this! > > My current set-up is 2 x FT1000MP, Alpha 87A, Acom 1000, Array solutions > SO2R box, Six Pack, 2 x Dunestar, C31XR at 70ft, XM240 at 85ft (Rt angles to > C31XR), Inverted Vees at 70ft for 160/80. All ants on one tower. The Six > Pack and Dunestars are now controlled using home built band decoders driven > from the band data output on the FT1000MPs. Manual switching is fine but > only whilst you are wide awake. > > Good luck > > Bob 5B4AGN, P3F, ZC4ZM > > > ----- Original Message ----- > From: "Jack Brabham KZ5A" <kz5a@mindspring.com> > To: <force12talk@qth.com> > Sent: Sunday, July 28, 2002 5:00 AM > Subject: [Force 12 Talk] C31XRs in SO2R ??? > > > > All, > > > > I am considering re-wiring my pair of C31XRs to the individual band > feedline > > arrangement to facilitate SO2R contest operation. The present plan would > > be to use the W3NQN filters with a WX0B switching setup. > > > > My concern is that the close proximity of the driven elements might be > more > > than the filters could deal with effectively. Has anyone out there tried > > this or a similar arrangement? > > > > I would appreciate hearing about anyone's experiences, good or bad, with > > C31XRs in this sort of setup. > > > > Thanks. > > > > 73 > > > > Jack Brabham - KZ5A > > 2013 Alyssa Court > > Azle, TX 76020 > > > > > > > > -------------------------------------------- > > Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. > > Force12 Web Site: http://www.force12inc.com > > > > To Submit Message to the List: Force12Talk@qth.com > > To unsubscribe and view the Message Archive: see > http://qth.com/force12/list > > For problems with the list: contact n4zr@qth.com > > > > > -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact n4zr@qth.com |
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