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echo: ham_tech
to: ALL
from: JEFF EDMONSON
date: 1997-07-02 20:27:00
subject: J-Pole antenna

Summer Dulldrums are here - people are off on vacation, and I've got some 
text files.  I'll start slowly, to see what kind of response we get.
         === 2 Meter J - Pole made from 300 ohm twin lead ===
  (Taken from Jan. 1984 D.A.R.C. antenna article by James Burks, KA5QYV)l
     _______     _____  <== DON'T SHORT THIS END
        |       |     |
        |       |     |
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        |       |     |
        |       |     |
        |       |     |
        |       |     |
        |       |     |
        |       |     |
        |       |     |
        |       |     |
      54 in.    |     |
        |       |    _| __________
        |       |   |_  __________}1/4 inch gap
        |       |     |           |
        |       |     |           |
        |       |     |           |
        |       |     |           |
        |       |     |           |
 attach shield==>|   |<==attach coax center conductor____
        |       |     |      16 3/4 inches             |
        |       |_____|           |                 1 1/4 in.[adj. this 
ength
     ___|___     |___|  __________|____________________|_       for min. SWR]
                   ^
   
1.  Start with 54 1/2" of good quality TV lead.
2.  Strip 1/2" of insulation and solder wires together.
3.  Measure 1 1/4" from bottom and strip insulation.
    This is solder point for coax feedline. (center on short side)
4.  Measure 16 3/4" from bottom and cut out 1/4" notch.
    This tunes antenna to middle of 2 meter band.
5.  Feed with a length of RG58U coax.  Tape coax at
    feedpoint to the twin lead.
6.  Antenna may be sleeved inside 1/2" PVC for outside
    mounting or thumbtacked to an inside wall.
73 = Best Regards
-Jeff KA5THB
Co-Moderator HAM_TECH
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