And full band coverage of 3.5 to 4.0 MHz with an SWR no greater than 2:1 except at the very high end of the band where it goes to 2.5 can easily be achieved, I have one. Take a look at the ARRL Handbook page 9-16 and you can see it. The "magic" is in the feedline - 1 wavelength of 50 ohm (RG-213) followed by 1/4 wavelength of 75 ohm RG-11. I hang mine as an inverted vee.
I would think the same principle could be extended to 160 meters if full band coverage there is desired. 73, Don W3FPR On 7/13/2011 1:28 PM, Dave Wright wrote: > 'Cookie' > > Noted...but I think full-band, no-tuner coverage of 40/20/15/10 isn't too > shabby. > > Dave > > On Wed, Jul 13, 2011 at 1:18 PM, WILLIS COOKE<[email protected]> wrote: > >> The request was in response to a statement that the KAT-500 was not >> required if an all band antenna was used. The challenge was to name an >> antenna that will give full coverage WITHOUT TUNER making the KAT-500 >> superfluous. Of course, full coverage of 20 is 14.0 to 14.35 and 80 and 160 >> are included. Alpha-Delta makes nice products, but achieving full coverage >> on 160, 80, 20 and 10 is elusive. Maybe you only work CW and don't care >> about the phone band or 10 meter FM, but if so, you don't require full >> coverage. Even 40 requires you to accept a pretty high SWR at the ends to >> cover the whole 40 meter band. LPs can be good for broad banding, but even >> the RCA LPs that I saw on Guam with the rotors that weighed about a ton only >> covered 7.0 MHz and up. >> >> Willis 'Cookie' Cooke >> K5EWJ& Trustee N5BPS, USS Cavalla, USS Stewart >> >> >> ------------------------------ >> *From:* Dave Wright<[email protected]> >> *To:* [email protected] >> *Sent:* Wed, July 13, 2011 11:43:49 AM >> *Subject:* Re: [Elecraft] KPA500 and KAT500 Ports >> >> I'll second that Alpha-Delta reference. Full band coverage on 40/20/15/10, >> plus about 100kHz on 75/80, partial-full coverage on 17m although it isn't >> cut for it, and some 6m as well. Full coverage 80m-6m with tuner...and >> even >> 160m, but the efficiency has to be terrible. >> >> And easily handles 500w+ >> >> 73 >> >> Dave >> >> On Wed, Jul 13, 2011 at 12:26 PM, Ken - K0PP<[email protected]> wrote: >> >>> Hi Cookie, >>> >>> My Alpha-Delta pretty much meets the no-tuner-needed >>> requirement. It's just a fan dipole with another name. (:-) >>> I'm aware of at least five of them in this sparsely ham >>> populated area. It -is- bandwidth limited on 80/75, but >>> mine's cut for 3550. >>> >>> My station is often used in major contests (KE7X) and >>> we put up the AD as a 2nd station antenna that doesn't >>> need any attention ... just switch to it and go. >>> >>> It's extremely well-made, but very heavy. It's at 65', >>> help up with 3/8" Dacron rope and heavy pulleys. >>> >>> 73! Ken - K0PP >>> >>> >>> ______________________________________________________________ >>> 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 >>> >> >> >> -- >> Dave >> K3DCW >> www.k3dcw.net >> >> "Real radio bounces off of the sky" >> ______________________________________________________________ >> 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 >> > > ______________________________________________________________ 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
