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echo: ham_tech
to: ROB DENNIS
from: JEFF EDMONSON
date: 1997-07-08 13:54:00
subject: J-Pole antenna

 >  RD>> Guess now that summer is here everyone wants to play
 >  RD>> antennas and outdoors so no time for bbs-ing.
 >  JE> Antennas would be a good thing to post about, then 
 >  Definatley. With summer here and the new cycle slowly begining
 > to take off antennas for every band imaginable are going to be
 > going up all over the place.
 >  Give a few people some ideas and antennas sprout like flowers.
With such abnormal antenna weather*, it might be something to post along the 
lines of Antennas for HF, too.
Here's some antenna discussion fodder:
A typical dipole cut for the lowest frequency you plan on working
(ie: 80m)
|-----------------------| |------------------------|
                        | |
                        | |  <--Feedline
                        | |
                     ___|_|___
|-----------------------| |------------------------|
         |              | |                 |
                        | |   <--Feedline
                        | |
                     ___|_|___
Above, the same 80m dipole with 40m 'tassles' installed.
A 'tassle' is just a chunk of wire around 4 to 6" in length, soldered onto 
the existing dipole, at the distance from the feedpoint calculated for 40m, 
to allow for resonation at 40m.
The result is a dual-band HF antenna that will not only work on 75/80, but 
40/15m as well.  (15m being the third harmonic of 7MHz)
Don't see why this won't work for a 40/20m situation, either.
Pro's: a substantial savings on the amount of wire used for the dipole - only 
one coax run needed, if setup right no tuner/balun needed.
Am interested in hearing from anyone why they think this will/will not work.
   73 = Best Regards
   -Jeff KA5THB
   ka5thb@bigfoot.com
*abnormal antenna weather:
You ever notice that you'll have more trouble out of an antenna that went up 
without a hitch, than you will with one that was put up in a driving 
rain/snow with high wings? };->
--- FMail 1.02
---------------
* Origin: Electronic Avenue BBS 210-533-5668 San Antonio, TX (1:387/510)

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