Hi Jim Not many folks have the space or ability to put up a full set of resonant dipoles. The MODERN off centre fed dipole is as good as you'll get any multiband antenna and for the most part will not need a separate antenna match box.
I suggest you measure the common mode current on a decent ocf dipole and see for yourself. Great progress has been made in the last few years and, yes I use your cookbook. David G3UNA > On 02 November 2021 at 19:09 Jim Brown <[email protected]> wrote: > > > On 11/2/2021 11:50 AM, CUTTER DAVID wrote: > > 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. > > I suspect you don't understand the physics of the problem. OCF antennas > are a yesterday's approach to multiband antennas. They are a recipe for > RX noise and RF in the shack. The concept was developed decades ago, > when there was far less noise than there is today. It's possible to fool > yourself that it's working fine, but you can't hear very well, so you > miss stations calling you. > > I run legal limit on FT8 for weak signal work on 6M and difficult paths > on 160M (EU from California) into resonant antennas that are choked and > fed with RG8 or RG11, and I regularly get signal reports 15-20 dB worse > than I give. Since signal reports on FT8 are signal to noise, that means > the other station can't hear. > > 73, Jim K9YC ______________________________________________________________ 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]
