Perhaps you could clarify what you meant by a modern OCF. What’s changed from the traditional model? Thanks.
Dan Presley 503-701-3871 danpresley@me. com [email protected] > On Nov 2, 2021, at 12:20, CUTTER DAVID via Elecraft > <[email protected]> wrote: > > 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] ______________________________________________________________ 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]
