Off center fed dipoles, Windoms and end fed half waves are primarily low power if not QRP antennas where you can do poorly with any antenna. They are prone to arcing, heating and RF where you don't want it. You are better off with conventional low radiation resistance antennas if you plan to use 100 watts or higher. The search for an antenna that will make QRP sound like a kilowatt is futile. The only way to do that is to have excellent conditions and infinite patience which will make anything sort of work. Willis 'Cookie' Cooke, TDXS DX Chairman K5EWJ & Trustee N5BPS, USS Cavalla, USS Stewart
On Saturday, July 5, 2014 11:55 AM, Dave <d...@g0dja.co.uk> wrote: I tried a 40M OCFD for a while. I gave up on it and went back to a centre fed dipole instead. Even on 40M it didn't seem very good and I was plagued with RF getting into PCs and them shutting down or periferals stopping working. Plus, despite the hype, it didn't really seem to work well on other bands. The Antenna analyser was very dismissive, showing resonances outside of the Amateur bands and, on some that it was supposed to work on, no sign of any resonance at all. Dave (G0DJA) ----- Original Message ----- From: "Jim Brown" <j...@audiosystemsgroup.com> To: <elecraft@mailman.qth.net> Sent: Saturday, July 05, 2014 2:24 PM Subject: Re: [Elecraft] A Good Antenna Length? > On 7/5/2014 2:05 AM, David Cutter wrote: >> You might consider an off-centre-fed dipole with appropriate balun and >> choke. > > Not if you're going to run power. An off center fed antenna generates high > common mode voltage, which will fry even the best choke when running > power. I wouldn't consider such an antenna at greater than 100W. > > 73, Jim K9YC > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to d...@g0dja.co.uk ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to wrco...@yahoo.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
