That is what I thought. Thanks for confirming that there is no change. Nizar
> On Jan 19, 2020, at 6:52 AM, Rick Hiller <[email protected]> wrote: > > > Modeled 80 meter 1 and 2 wire with .1 foot spacing #14 copper at 60 feet. > Open ends and shorted ends. > No, it does not. Minimal change in resonant freq, feed Z and gain. > RH > >> On Sun, Jan 19, 2020 at 3:05 AM Nizar Mullani <[email protected]> wrote: >> Rick, >> >> Chris bright up an interesting point regarding what may be different in the >> antenna if the ends of the wires are connected or not. He says (my >> understanding) that a Cage antenna has the distal ends connected together. >> If not, it is not a Cage antenna. >> >> My question is, if I had a two wires dipole, exactly same length and close >> together, does the antenna behave differently if the ends are connected or >> not? >> >> Nizar K0NM. >> >>>> On Jan 18, 2020, at 8:10 PM, orin snook via BVARC <[email protected]> wrote: >>>> >>> >>> Well Done Rick! Much appreciated! >>> >>> 73, >>> KB5F/mm >>> From: BVARC <[email protected]> on behalf of Rick Hiller via BVARC >>> <[email protected]> >>> Sent: Saturday, January 18, 2020 8:05 PM >>> To: BRAZOS VALLEY AMATEUR RADIO CLUB <[email protected]> >>> Cc: Rick Hiller <[email protected]> >>> Subject: [BVARC] Conclusions of the antenna technical question. >>> >>> The antenna is a "horse fence" antenna. Google it. 15+ strands of #30 >>> stainless wire, separated from each other and woven into a 1.5" wide strip >>> of plastic webbing....like a folding beach chair web. >>> >>> So I was looking for the magic that was claimed. After all y'alls >>> comments, one on one discussions and revisiting the web sites marketing >>> material and youtube videos, I certainly did not find it.. >>> >>> In the end, the multiple wires provide only a wider useable bandwidth on 80 >>> meters. Other bands too but 80 is the bandwidth eater. No other normal >>> antenna attributes are affected. The you tube video shows the antenna as >>> a mutiple band 80, 40, 20, 10 antenna and after listening to the video a >>> few times it is only by the use of an in shack ATU (tuner) that you get >>> "flat" SWR on 40 and 20. (That is another sore subject with me, but later). >>> >>> 80 meters, the fundamental band of resonance, requires no matching network, >>> just like a normal, single wire 1/2 wl dipole. The useable 3:1 SWR >>> bandwidth on 80 is pretty good at about 200 KHz...maybe a bit more >>> depending on how high you put it up. A single wire dipole bandwidth is >>> around 50 to 75 KHz 3:1 swr if you're lucky. >>> >>> So, in NEC modeling this antenna I did a bandwidth comparative model for a >>> single wire and found that a single, copper wire antenna had to have a wire >>> diameter of about 4 inches to have the similar bandwidth result. Of >>> course, there is no wire 4" in diameter available at Home Depot, so a >>> multi-wire "Cage" dipole, as a few had mentioned, is the way to go for >>> equivalence. >>> >>> I guess the benefit of the Horse Feather antenna is that it is a single >>> 1.5" wide material that is easily deployed. No putzing around with 15 >>> individual wires, just one interwoven web deployment on each side of the >>> dipole. >>> >>> If this is something you think you can use......go to >>>> http://kf4bwg.com/ Horse Fence Antenna >>>> >>>> or if you wish to build it yourself....material etc. can be had at >>>> >>>> https://www.statelinetack.com/item/safe-fence-1-1-2in-wide-poly-tape-200-ft/SLT700567/ >>>> Fencing material. They also have the end, wire connection clamps >>> >>> I appreciate all that chimed in to set me straight. Kurt Sterba in World >>> Radio Magazine years ago used to write a column debunking the claims of the >>> fly by night antenna manufacturers. I wish he were still around so he >>> could comment on this horse feather antenna. Also, e-ham has a few >>> differing reviews posted. >>> >>> TNX ES 73.....Rick -- W5RH >>> >>> Rick Hiller >>> e-mail: [email protected] >>> >>> ________________________________________________ >>> Brazos Valley Amateur Radio Club >>> Get on the air - 146.94 Repeater >>> Volunteer now for the Houston Hamfest >>> >>> BVARC mailing list >>> [email protected] >>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > > > -- > Rick Hiller > e-mail: [email protected] > Cell: 832-474-3713 > Physical: 9031 Troulon Drive > Houston, TX 77036
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