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[TowerTalk] Full wave loop on 80m : Impedance 50 or 75 Ohms??

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Subject: [TowerTalk] Full wave loop on 80m : Impedance 50 or 75 Ohms??
From: (Lee Noonan)
Date: Mon Jan 27 22:18:18 2003
I have been using Full wave loops on 80m since 1987 and have always used 75 Ohm 
coaxial cable as feedline without a Balun.  I know of other hams that use a 
Balun on a full wave loop. My Loop is Rectangular in Shape and fed in the 
center of one of the shorter sides. The Antenna is terminated with a gap of 
around 3 inches between the ends.
This was how it was described , for a German Quad antenna which is a Full wave 
loop in a Diamond shape terminated at one of the sharp pointed ends..The German 
Quad was Quoted with an Impedance of roughly halfway between 50 & 70 Ohms 
Impedance.. My Quad antenna is 33 feet high at all 4 points.  Any Comments on 
what impedance this Antenna May be at the feed point and how to feed it with 
Coaxial cable... I am about to run ALL new cables thru the roof of My House and 
I'm wondering whether to use 50 or 75 Ohm Cable...
Lee Noonan  VK2LEE
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