[Antennas] J-Pole antennas

[Jim Hargrave]

This discussion has about run its course. We have had some excellent
"Opinions" and some good "theory" statements. Perhaps there is some truth in
each post.

I have no idea how it should be fed to be "Politically correct". Some have
strongly advocated that a choke/balun etc MUST be used to feed the J-Pole.
Maybe so, maybe not. I wont argue with the experts here.

Now for the "practical" side of the argument, I have successfully used my 3
band J-Pole for the past 25 years or so. I built it with copper tubing and
Installed separate feed coax up thru the center of the tubing and brought
the end out at a predetermined feed point for each stub. I have no idea how
this would model, however I have never used any kind of choke at the feed
point of the antenna. I suspect this feed method simulates a Bazooka type
feeder system, and maybe the mast acts like an RF choke. All I really know
is I built it that way and it works great. I used it 24/7 for about 10 years
on my packet BBS with 145.01, 223.58 & 446.1 packet nodes. I hand tuned each
element for min SWR at the three operating frequencies.

So if I defied the correct "Theory", my antenna does not know any better and
keeps on working.

   * 73's Jim W5IFP *
     w5ifp at gvtc.com

   >-----Original Message-----
   >From: antennas-bounces at mailman.qth.net
   >[mailto:antennas-bounces at mailman.qth.net]On Behalf Of Terry Conboy
   >Sent: Friday, November 27, 2009 18:59
   >To: antennas at mailman.qth.net
   >Subject: Re: [Antennas] J-Pole antennas
   >
   >
   >There have been a few times when I have questioned some of the articles
   >and postings by Tom W8JI, but after I spent more time considering what
   >he said, he has invariably turned out to be right.  I've caught
   >him in a
   >couple of typos, but he graciously corrected them after they were
   >pointed out.  He has a vast amount of experience with antennas, both
   >theoretical and in the real world.
   >
   >Perhaps Clete can explain the points where he disagrees with Tom's
   >analysis of J-poles at
   >
   >http://www.w8ji.com/end-fed_vertical_j-pole_and_horizontal_zepp.htm
   >
   >It all seems very logical and straightforward to me, and in agreement
   >with my models.
   >
   >73, Terry N6RY
   >
   >On 2009-11-27 10:20 AM, C.Whitaker wrote:
   >> de WB2CPN
   >> I looked at the link, and I've rarely seen anything
   >> so erroneous and just plain wrong.
   >> 73 Agn  Clete
   >>
   >>
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