BBS: SWEDX Conference: SHORTWAVE Date: 7/26/1992 From: STEPHEN LEE ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Originally in: Area Ham, Msg#90, Feb-17-92 22:22:02 Originally From: Tad Cook Originally To: Marty Watt Subject: Re: 2m J-Pole Here it is: The following is a description of a J-Pole antenna made from 300 ohm TV twin-lead. Quite a few of the hams in the area have successfully built one more of these antennas. They have quite a few advantages which include improved performance for 2-meter HTs, portability, and last, but never least, they are inexpensive. | | do not short this end. | | | | | | | | | | 54" | | | | | | | | | 1/4" gap | | | | | | 16 3/4" coax ctr conductor=>* *<= coax shield | | 1 1/4" | | -*- solder the twin leads together at bottom 1. Start with 54 1/2" of TV twin lead (foam core does not work as well) 2. Strip 1/2" of insulation at bottom and solder wires together. 3. Measure 1 1/4" from soldered wires and strip insulation on both sides. This is the solder point for a coax feedline. 4. Measure 16 3/4" from bottom and cut out 1/4" notch on one side. 5. Feed with a length of RG58U coax. Tape coax at feedpoint to the twin lead for strength and weather protection. I have also attached an aligator clip to the plastic on the top of the antenna in order to conveniently hang it. I am successfully using one in my attic to avoid any CCNR problems. I have another that I can take with me camping, sailing, etc. This design has appeared on many BBSs and in club newsletters; the earliest reference that I know of is a Jan. 1984 D.A.R.C. antenna article by James Burks, KA5QYV. 73, Tad KT7H @ N7DUO.WA.USA ----------------------------------------------------------------------- Later, Stephen. * Origin: -[< The Spyder's Web >]- Nanaimo, B.C., Canada. (1:351/268)