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W6KWF > TECH 09.09.90 21:00l 46 Lines 1657 Bytes #999 (0) @ WW
BID : 86292_W1XSC
Read: GUEST
Subj: J Pole Antenna from 300 ohm ladder
Path: IW8PGT<LU4ECL<VK2RZ<N6PNK<VE3CGR<PI8ZTM<CX2SA<N6RME<W1XSC
Sent: 260909/1615z @:W1XSC.#NCA.CA.USA.NOAM [Santa Clara Co] #:86294 $:86292_W1
=== 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
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attach shield==>! !<==attach coax center conductor____
! ! ! 16 3/4 inches !
! !_____! ! 1 1/4 in.[adj. this length
___!___ !___! __________!____________________!_ for min. SWR]
^
<Solder the twin leads together here>
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.
Kenneth, W6KWF @ W1XSC.#NCA.CA.USA.NOAM
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