Jim…… First….. what length is your OCFD ? 2nd…… What Height above ground ? 3rd…… What Feed line are you using ? 4th …… What Band do you Operate on Most ? I can Model the Antenna and give you the results .
Ray WA6VAB K3 From: CUTTER DAVID via Elecraft Sent: Tuesday, November 2, 2021 11:50 AM To: [email protected]; [email protected] Subject: Re: [Elecraft] Problem Tuning K3 Jim Don't stay stuck in the past: not all ocf dipoles are created equal. With properly designed transformers and chokes, the common mode current can be tamed to perfectly decent levels. David G3UNA > On 02 November 2021 at 18:25 Jim Brown <[email protected]> wrote: > > > On 11/2/2021 6:15 AM, Bill via Elecraft wrote: > > I assume your using a balun with your > > OFC antenna. I had a similar problem with my OCF that turned out to be the > > balun. It was fine under low power but would not tune under high power. > > NO! The problem was that by their nature, OCF antennas are BADLY > unbalanced, placing very high stress on a common mode choke, so are > likely to fry ANY common mode choke that does anything useful. > > Study k9yc.com/RFI-Ham.pdf > > AND -- erase the word "balun" from your vocabulary. It is used to > describe almost a dozen very different things, obscuring understanding > of how things work. > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
