Eike Lantzsch, ZP6CGE wrote:
wrote:
I have been reading alot on different designs and have read
contradictory information on this. Does nayone here have an
opinion?


As I understand it, a J-pole is derived from nothing but an inverted
Zeppelin-antenna. That makes the feedpoint a balanced one and you
need a balun or at least a choke. But as a Zepp-antenna it does not
need any ground just like ordinary dipoles don't. But if you ground
a J-pole the ground needs to be exactly in the middle of the short
in the feed line. For practical reasons most J-poles are not
constructed this way.

Also, when building a j-pole, could I run the wire inside the
tube.
(Regular jacketed copper wire) to the bottom of the tube to a pl
connector? Or would this mess up the impedance?


What you are looking for is on YO5OFH, Csaba Gajdos web page he
http://www.qsl.net/yo5ofh/projects/a...ol_antenna.htm
but I didn't try the design myself yet. I might within short.

There is ample of information on J-poles he
http://www.cebik.com/jp1.html

Kind regards, Eike
So, does a j pole need to be insulated from the antenna mast?