And you now dear list users, i have a G5RV and i really love it it works allways, and give’s me good results :-))
Just have to say that. Regards William PE1BSB > On 05 Aug 2016, at 16:58, Phil Wheeler <w...@socal.rr.com> wrote: > > Alas, the poor G5RV. Now that its been flogged to death, maybe we need a new > target -- say the Windom? > > Phil W7OX > > On 8/4/16 10:22 PM, Wes Stewart wrote: >> The tuner loss also depends on how it is adjusted. For example the very >> popular high-pass Tee with three adjustable elements has an infinite number >> of possible combinations that will effect a match on the same load Z. One >> of them is the lowest loss solution, all of the others aren't. >> >> As I said earlier, in a letter to Dean Straw dated February 2, 1994 I >> offered an example where the SPC tuner, then current in the handbooks, could >> be used to match an impedance of 4.34 +j46 to 50 ohm. (I forget where this >> came from but it was a real possibility) I assumed Qc = 1000 and Ql = 300 >> (generous). I used Touchstone to calculate the minimum loss and maximum loss >> solutions The best case was 1.6 dB and the worst case was 7.8 dB. >> >> With lower Q components, Qc = 500, Ql =200, the losses were 2.4 to 9.5 dB! >> >> Wes N7WS >> >> >> On 8/4/2016 2:00 PM, Alan Bloom wrote: >>> > It's a pity that too many newcomers, as well as many oldsters, are >>> > enamored by this piece of wire. >>> >>> The G4RV is definitely a compromise antenna. However its advantage is that >>> is has low-enough SWR to be easily matched by most tuners on a number of >>> bands. >>> >>> > ... the horrific losses that could be incurred even >>> > with high quality tuners, >>> >>> It's true that tuner losses are the manufacturers' dirty little secret. >>> Loss is rarely specified, partly because it can be pretty bad, and partly >>> because it is hard to measure, but also because it is not constant - it >>> depends on the particular impedance being matched. >>> >>> One exception is the old Drake tuners. Their Pi-L topology makes the loss >>> almost independent of the load impedance. If you can get it to match, you >>> know that almost all the power is going into the feed line. For example, >>> the MN-2700 that I designed when I was at Drake was specified at 0.5 dB >>> maximum insertion loss and I did a lot of testing and tweaking to achieve >>> that on all bands. >>> >>> Alan N1AL > > ______________________________________________________________ > 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 pe1...@zendamateur.nl ______________________________________________________________ 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
