Check this link out. It works flawlessly. audiosystemsgroup.com/*RFI*-Ham.pdf
On Thu, Oct 24, 2013 at 7:47 PM, Charlie Cunningham < charlie-cunning...@nc.rr.com> wrote: > That would work as well. I used something similar, but with less turns to > precede the 4:1 current balun feeding the drivers on my home brew 5-band > quad. > > Charlie, K4OTV > > -----Original Message----- > From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Jim > Bennett > Sent: Thursday, October 24, 2013 7:41 PM > To: g...@ka1j.com > Cc: topband@contesting.com > Subject: Re: Topband: Balun question > > I was just looking through the ARRL Antenna Book - if it's RG-8, then 8 > turns would work if wound on an 8 inch PVC tube. However, that size PVC may > be difficult to find, and certainly wouldn't be to spiffy hung way up the > air. But then again, you were thinking about 10 turns on a 12 inch diameter > form...? I assume you were going to place it at the apex of the Inverted > Vee, right? An alternative would be to get 5 mix 31 ferrite cores, 2.4 inch > OD and pass the coax through it six times. That ought to get about 5,000 > ohm > impedance at 3.5 MHz and would do the trick. I'm using exactly that on my > 80 > meter Inverted L and it does a fine job. Mouser has those cores for $6-$7 > each. > > Jim / W6JHB > > > On Thursday, Oct 24, 2013, at Thursday, 4:25 PM, Gary Smith wrote: > > > Though this reflector is for 160M I have an 80M question that might be > > best asked here. My father W1BML is on an 80 meter net nightly. > > His antenna in an inv-V with 40 & 80 elements though he never uses 40 > > any more. I needed to fell a couple of trees to remove branches that > > were touching his copperweld and the W2AU balun he had broke in two > > during the process. (Don't ask, your imagination is probably correct) > > :) And he would like it put back the way it was, with a balun. He's > > 96 so I try to keep him happy. > > > > I'm thinking 10 or so rolls of coax around 1' in diameter ought to be > > fine for a choke on 80. Any better suggestions? > > > > Thanks, > > > > Gary > > KA1J > > _________________ > > Topband Reflector > > _________________ > Topband Reflector > > _________________ > Topband Reflector > -- Randy Lake N1KWF 73 Gunn Rd. Keene,NH _________________ Topband Reflector