"Walter Underwood wun...@wunderwood.org [KX3]" <kx3-nore...@yahoogroups.com> wrote:
> I got the whip for 17m. I figure there is not much difference between a coil > at the base of the whip and a coil inside the ATU. Neither one will radiate. > So get a whip for the highest band you want to use and let the ATU provide > loading for lower bands. That is not my experience. A high-Q loading coil, combined with the whip, is resonant near a given band and provides much lower loss than a whip of the same length with no coil, matched using the internal ATU. So while the ATU *can* match the whip on bands other than the design band, the farther you get from the design band, the greater the loss. That said, a 17-meter whip is a good choice if you want to occasionally use it on 20 and 15 meters and you're willing to accept the comopromise. I'll try to put some numbers this. I have whips for all three bands for comparison. When I operate mobile I use a 17-meter whip for this reason. A mobile whip with a larger tunable coil would work much better outside the design band, but my XYL (when she's riding in my CRV) prefers the svelte look of that skinny, single-band radiator :) Wayne N6KR > > > wunder > K6WRU > Walter Underwood > CM87wj > http://observer.wunderwood.org/ (my blog) ______________________________________________________________ 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
