As I recall, when I wound the tranformer for my 40' X 10' KAZ terminated loop, I wound it 3:13 T because I was trying to match from 50 ohms up to around 950 ohms. The core I used was binocular that I cobbled together by taping together two Fair-Rite tubular cores, side-by-side. I used wire-wrap wire. Worked really well, and surely helped me on 160 and 80m, but it was a great receive antenna for 40 and 30m as well.
73, Charlie, K4OTV -----Original Message----- From: Topband [mailto:[email protected]] On Behalf Of Mike Waters Sent: Saturday, August 24, 2013 6:00 PM To: topband Subject: Re: Topband: Two 2:1 transformers to choose from!! All those turns are better for what? For the winding that's connected to the coax (either 50 or 75 ohms), two turns is plenty. And good luck stuffing all that wire inside the holes in those binocular cores, especially if you use the recommended protective insulating liner. :-) 73, Mike www.w0btu.com On Sat, Aug 24, 2013 at 4:27 PM, Jim GM <[email protected]> wrote: > So the general concessions is that 7:5 turns was better. Do is 15:7 turns > or 21:10 turns better? Whats best for 160M ? > _________________ Topband Reflector _________________ Topband Reflector
