Topband: VF - It is what it is

Dennis OConnor ad4hk2004 at
Thu Mar 29 06:19:23 EST 2007

Tom, what I suspect is the fact that the foam is not tough and that the center conductor can slowly ooze away from it's center alignment, especially if the coax is strongly coiled or bent...  High temperatures, sunlight heating, etc., will soften the foam and make the drift happen more rapidly...  I have seen the occasional  piece of foam coax  on my own station where the center conductor was pushed sideways almost to touching the braid <one was a piece that was accidently kinked around a rotor... While I did not bother to do a VF measurement I know that the changed geometry will have to affect the VF... I suspect this is what is being warned about in VF critical applications...
  denny / k8do

The fish are biting.
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