The video and website referenced should have some things pointed out. The video SWR values called out are those obtained through the tuner in the K-2. At times I have had the unused antenna accidentally selected and ran the tuner and got reasonably low swr matches. It found a match but a lot of power would have been dissipated in the tuner. The website for the 9:1 balun nicely does not claim the antenna described using 30 feet of wire as an end fed half wave but rather and end fed antenna On 40 meters that length is near a quarter wave and would need a ground system for good performance. On 20 meters it is near a half wave but not quite. That may be good, making it easier to match. Note a tuner is required
Using an antenna like this can make contacts. On most frequencies the swr in the coax from the balun to tuner will be high and thus loss could be high for long runs of lossy coax. For portable operation with a few feet of coax that should not be much of an issue. There is nothing magic about the configuration. It should work better than the greatly shortened wonder antennas. A say 25 foot wire connected to the output of a tuner would probably do as well eliminating the use of the balun A ground system as simple as a single radial will improve results in most cases. 73 - Mike WA8BXN -------Original Message------- From: Burke Jones Date: 5/8/2012 2:22:45 PM To: N1EU Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] Portable Antennas (Is there an "easy" button?) Forgot the link - sorry about that! http://www.earchi.org/92011endfedfiles/Endfed6_40.pdf On Tue, May 8, 2012 at 1:11 PM, Burke Jones <burkejo...@gmail.com> wrote: > Here is a good link for the EFHW which details the matching box that is > discussed in the video. I just ordered some supplies today to build one > (or two) of these. > > Burke Jones > N0HYD > KX1 > > > On Tue, May 8, 2012 at 12:06 PM, N1EU <n1eu.ba...@gmail.com> wrote: > >> I agree that the EFHW is a good performer and it's a main player in my >> portable arsenal. However, I give little to no credence in the >> "comparison" >> featured in that linked video. There's no evidence that they're remotely >> aware of the azimuthal pattern of the 135ft OCF on 15M. Hint, it's NOT >> broadside. >> >> 73, >> Barry N1EU >> >> >> >> Stan levandowski wrote >> > >> > Tom, it's by no means a perfect antenna but it *does* perform quite well >> > for me. >> > >> > >> >> After watching Stan Video last night I placed an order for a few >> >> T-106-2's to build the transformer...looks pretty straightforward and >> >> inexpensive. Tnx Stan >> > >> >> >> >> On 5/7/2012 1:43 PM, Jim Lowman wrote: >> >>> Enjoyed the video, Stan. I may look into one of these. >> >>> >> > >> >>>> >> >>>> See my "not perfect, but pretty darn good solution at" : >> >>>> http://www.youtube.com/watch?v=uWkpQ785Pjo >> >>>> >> >>>> >> >>>> 73, Stan WB2LQF >> > >> > >> >> >> -- >> View this message in context: >> http://elecraft.365791.n2.nabble com/Portable-Antennas-Is-there-an-easy-button-tp7533480p7539897.html >> Sent from the Elecraft mailing list archive at Nabble.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 >> > > ______________________________________________________________ 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 ______________________________________________________________ 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
