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guys, but since the wires are in the NEAR field of the antenna elements, and not equally excited across their entire length, the ARRL formulas DO NOT APPLY. ANY length except very SHORT lengths (considerably shorter than a 1/2 wave at the HIGHEST frequency in use) WILL carry significant current and screw up the pattern, if not the feed impedances. For all practical purposes those lengths are an old wives tale. For tribanders, the longest length to use before breaking up is eleven feet. Even then there is some effect on 10. 73 ----- Original Message ----- From: "Harris Leck" <leckfam@attglobal.net> To: "Guy Olinger, K2AV" <k2av@contesting.com>; "Sylvan Katz" <jskatz@sk.sympatico.ca>; <Force12Talk@qth.com> Sent: Wednesday, July 24, 2002 10:04 AM Subject: RE: [Force 12 Talk] C31XR & guy wire detuning > Long before synthetic guys were developed, we all used EHS or other metallic > supports. I have relied with satisfaction on the ARRL handbook or Antenna > Handbook chart that shows acceptable guy wire lengths. It is a fair bit of > work by the time all the insulators are installed but it does work and it is > less expensive. > Cheers. > Harris VK6AV VE6DK > Perth > > > -----Original Message----- > From: Guy Olinger, K2AV [mailto:k2av@contesting.com] > Sent: Wednesday, July 24, 2002 9:48 PM > To: Sylvan Katz; Force12Talk@qth.com > Subject: Re: [Force 12 Talk] C31XR & guy wire detuning > > > Sylvan, in your post YOU said SHIPPING was the reason, not cost: > > "ps - please do not recommend the use of Phyllistran -- it is too > costly to have it shipped here :)" > > Obviously if COST is an issue and you have local cheep sources for > insulators and grips, and you don't mind how it looks, go for it. > > ps, nobody in Canada sells Philly? > > ----- Original Message ----- > From: "Sylvan Katz" <jskatz@sk.sympatico.ca> > To: "Guy Olinger, K2AV" <k2av@contesting.com>; <Force12Talk@qth.com> > Sent: Wednesday, July 24, 2002 8:43 AM > Subject: Re: [Force 12 Talk] C31XR & guy wire detuning > > > > >And you're going to tell me it's cheaper to ship nine insulators > and > > >18 big grips than 100' of Philly (weighs the same as rope) and six > > >Philly grips? Or maybe you got the insulators and the grips laying > > >around. > > > > Hmmm - now let me see if this makes sense? > > > > Assume a 100 ft guy > > > > Case 1 > > > > Phyllistran from Burghardt http://www.burghardt-amateur.com/ > > > > HPTG 4000I Phillystran 0.85/ft * 100 = $85.00 (US) > > (Texas Towers is $0.89 foot) > > Phillystran 3/8" GRIP WITH THIMBLE 2100I 2 x $6.49 (US) = $13.00 > > (Texas Towers 8.50 each) > > > > Total $170 Canadian including Federal tax and NOT including shipping > and > > handling > > (exchange rate $1 US = $1.63 Canadian and Federal Tax = 7%) > > > > Case 2 > > > > 3/16" EHS from Princess Auto http://www.princessauto.com/ > > 100 ft 3/16 EHS - $20 Can > > 2 Thimble - $.60 Can > > 3 Grips /$1.20 x 18 = 21.00 > > 9 Ceramic egg type power line insulators $3 each from the scrap yard > = $27 > > > > Total Cost $78 Canadian including 15% Federal & Provincial sales > tax and > > no shipping required > > > > Phyllistran/EHS = $170 / $78 or Phyllistran is about 2 times the > cost NOT > > including shipping. > > > > I guess it is best to check the fact! > > > > .. sylvan > > > > Ô¿Ô¬ > > ---------------- > > Sylvan Katz, VE5ZX > > Saskatoon, SK > > "A Novel Perspective of Amateur Radio Contesting" at > > http://www.dynamicforesight.com/~ve5zx > > > > > > > > > > > > > -------------------------------------------- > Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. > Force12 Web Site: http://www.force12inc.com > > To Submit Message to the List: Force12Talk@qth.com > To unsubscribe and view the Message Archive: see http://qth.com/force12/list > For problems with the list: contact n4zr@qth.com > > -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact n4zr@qth.com |