Hello, I wouldn't bother with a J-Pole type antenna for HF. The only one I made remotely close was a Slim Jim for 6m, with ladder line. It worked well. Making an UNUN for an end-fed is much simpler. All it takes is one toroid and one capacitor if you want it to be adjustable.
My favorite portable antenna now is a 9:1 EARCHI UNUN, a 19ft wire and a 6m fishing pole. It's not a half wave but it works well down to 40m. If I can find a tree then I throw a half wave wire and tune it with my Ilertenna end-fed tuner. There is only one "tie-up" point, very practical and gives me a low radiation take-off angle. Except for 80m I'm done with horizontal antennas, especially in the field. It's just too hard to get them high enough and the results are never as good as an EFHW. The only instance I would use a counterpoise wire with an EFHW is if my coax cable (RG-174) is shorter than 25ft. Otherwise it doesn't make any difference that I can tell. Gil. [email protected] wrote: > I know the J-pole is pretty effective for VHF and would think for HF > also? If the quarter wave matching stub were somewhat shorter, I was > thinking the difference could be made up by an inductor or coil at the > near end? A secondary link coil approximately equal to the impedance > of the coax feed line should effectively couple the RF to the stub and > EFHW wire? Some value of inductance coupling should be ideal for a > good match between coax line and the 1/4 wave matching stub. -- Development, Unix servers, Databases. PGP Key: http://keskydee.com/gil.asc If mail bounces try [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]
