I built it in one evening using two pieces of scrap 1x3 lumber for spreaders. I pounded in four large wire staples to hold the wire to the spreaders and threaded both loops through them. The five wire and one wire pickup loop are not separated. I used a variable cap of roughly 150-200PF to resonate the 5 wire loop. I fed the pickup loop directly with RG-58 coax. No matching transformer. The loop is roughly 32 inches square. I tune the cap for maximum noise for the desired frequency. The loop is tunable from about 1600 - 1850 KHZ.
I modeled my loop after the following designs for unshielded loops. http://www.i1wqrlinkradio.com/antype/ch9/chiave1183.htm http://members.verizon.net/~vze24qhw/loop.html On Tue, 2012-04-10 at 08:49 -0400, joe wrote: > I am experimenting with a small one meter square loop. It is 5 turns of > #14 wire with a one turn pickup loop. Feeding the pickup loop directly > with 50 ohm coax. Using air variable cap to resonate the 5 turn loop. > I have it setup in my basement on a tripod with small TV rotator and it > works amazingly well. I can null stations about 3-4 S units with it and > it is about 4 S units (24 DB) quieter than my inverted L. I also have a > short 140 foot BOG and the loop performs nearly the same with the added > ability null out noise sources. I plan to move it outside and take some > more measurements. I'm pretty impressed so far. -Joe KB3KJS > > > > > On Mon, 2012-04-09 at 17:17 -0700, Jim WA9YSD wrote: > > How well does this antenna perform in a City environment like mine on top > > of a 50 foot tower? > > > > Stay on course, fight a good fight, and keep the faith. Jim K9TF/WA9YSD > > _______________________________________________ > > UR RST IS ... ... ..9 QSB QSB - hw? BK > > > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
