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The initial problem was the SWR had shifted waaay high on 20 M. I undid the cover this morning - intending to "squeeze" the 20M coils together. Unfortunately, the coils were already as close as they could be !! What to do?? I then noticed that, looking axially along the coil board, that most of the coils were almost in alignment. SO, thinking that I might be getting some mutual inductance coupling, I moved the 20M coils (just a tad) so that they were less in alignment with the other coils. An SWR sweep showed that I had lowered the resonant point down about 50 Khz. Not much but the real benefit was that I now was less than 2:1 across the whole band. I did check all the bands available on the Sigma 5. 12M had gone up (but flat) at 1.5 to1 and15M was now flat at 1:1 !! And 10M was flat at 1.6:1 I can live with that <G> If anyone at Force12.inc is reading this --- any alternative(s) to suggest?? Next step:- to replace all RG-8/RG-8X with "Buryflex" - running qrp means you need to get every milliwatt to the antenna <g> Thanks for everyones' input... Dave KK7SS K2 #3003 -------------------------------------------- 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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