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help prevent qrm

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  • David Michael Gaytko // WD4KPD
    20m was a mess today, everyone planting on 076. this is not necessary ! try this... set in spectrum the jt65 DF axis option freeze the program to 0, with tol
    Message 1 of 1 , Apr 6, 2007
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      20m was a mess today, everyone planting on 076.

      this is not necessary ! try this...

      set in spectrum the jt65 DF axis option

      freeze the program to 0, with tol to 200

      tune whichever station you wish to tune by shifting
      your dial to place the sync tone on 0

      the 200cps tol will effectively give you a filter 400cps
      wide around the other stations rf freq and it will not
      decode anything outside the window, this eliminates lots
      of qrm to you. if you rig cant quite tune that close, when
      most of the other stations tones are withing that window
      you can re-freeze

      the idea is to not use a large DF and take up more space
      than needed, and spread everyone out a bit.

      300cps is more than enough to ensure no qrm.

      daivd/wd4kpd
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