Subj : Looking into HAMing...
To   : Angus McLeod
From : Deuce
Date : Sun Aug 21 2005 11:52 pm

  Re: Looking into HAMing...
  By: Angus McLeod to Frank on Mon Aug 22 2005 00:03:00

 >  >    Do you have a URl that details building the PVC jpole. I'd really like
 >  >   build one for 220mhz. Something that allows calculations for frequency 
 >  >   construction dimensions.
 > 
 > No, I did all my calculations based on formulas in the ARRL Antenna book,
 > and other sources.  But if you want to build a folded-J using twin-lead,
 > you can go here:
 > 
 >      http://www.qsl.net/ke3fl/prgms/JPOLEFRM.HTM
 > 
 > to get some dimensions based on frequency and the VF of the wire you will
 > be using.  Don't forget to check the "Inside PVC" box...

My understanding is that it's 3/4 wave for the long part and 1/4 wave for the
short bit... you adjust the feed position for lowest SWR... can't remember what
you fiddle with the spacing between them while looking at though.

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