On occasion I've run into RF in my KX3 when using a coax to feed random length antenna. The symptom was that the radio wouldn't transmit with anything other than trivial power, even though the tuner matched easily. A quick choke wound out of the coax helped a little, but the Elecraft BL2 stopped the problem.
Personally I don't worry too much about the match when the radio is close to the "antenna" if the tuner matches. - Brendon On Fri, Feb 10, 2017 at 7:56 AM, Don Wilhelm <donw...@embarqmail.com> wrote: > Brian, > > If your end fed antenna is actually a halfwave (which is what EFHW means), > the answer is no. > > The solution for portable work is to use a length that is not a halfwave - > 58 feet is known to work well for 40 thru 10 meters when used with a 13 > foot counterpoise. Double the lengths if you want 80 meters. > > With that antenna and counterpoise length, dispense with the balun for > portable operations, and use a BNC to Binding post adapter instead (no > coax). > > If you need to use a short length of coax, you can put the balun at the > end of the coax, and you can try both the 1:1 and 4:1 positions to see > which provides the better match. > > 73, > Don W3FPR > > > On 2/10/2017 10:36 AM, Brian Pietrzyk wrote: > >> Speaking of baluns or un-un's... I'm about to assemble a BL2 which is a >> 4:1. Will that be enough to bring an End Fed Half Wave (EFHW) within tuning >> range of my KX3 ATU? >> >> I'm going to be ve3bwp/hi9 QRP week after next and hoping to try a couple >> of different length end feds into one of the trees near the beach. I'll be >> trying Phone and psk31/JT65/CW an afternoon or two that week. Anyone >> interested in a sked email me direct. >> >> ______________________________________________________________ > 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 bren...@whateley.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
