kc4atu at hotmail.com
Sun Feb 1 11:15:08 EST 2009
You are part right, the G5RV was designed because G5RV was looking for a 20m wire antenna which would give him some gain in the directions he wanted and it would work without a tunner and fit in his garden. The fact that it works on 80 and 40 are a plus, but 20m was
what it was designed fore and where it works best.
73, Bill KC4ATU
> From: Rsoifer at aol.com> Date: Sun, 1 Feb 2009 09:09:18 -0500> To: tentec at contesting.com> Subject: Re: [TenTec] G5RV> > Bob,> > You're right that it would no longer be a G5RV. As you know, the G5RV was > originally designed to present a reasonably low impedance on the 80, 40 and 20 > meter bands. That's all. It worked satisfactorily enough for the > vacuum-tube transmitters of that era..> > By moving to a fully balanced-fed antenna with a tuner, we enable it to > provide a 50-ohm load to match today's fussy solid-state rigs, and add bands such > as 30, 17, 15, etc., for which the G5RV was never designed.> > Yes, a resonant dipole would produce a more predictable radiation pattern, > but if the tuner is a low-loss design, the radiation efficiency of the > 102-foot wire would be so close to it as to be indistinguishable in practice. When > I replaced my New Jersey G5RV with a full-size. balanced-fed 80-meter dipole, > I could see the improvement on 80 but the performance on the higher bands > was virtually the same.> > 73,> > Ray W2RS> > > > In a message dated 2/1/2009 4:09:51 A.M. GMT Standard Time, > RMcGraw at Blomand.net writes:> > Then it's no longer a G5RV. It is then a chunk of wire with a balanced feed > > attached to a tuner which matches the transmitter to the load. Those work > quite well but not as well as a 1/2 wave at the lowest intended frequency > and those other higher frequencies harmonically related.> > 73> Bob, K4TAX> > > ----- Original Message ----- > From: <Rsoifer at aol.com>> To: <tentec at contesting.com>> Sent: Saturday, January 31, 2009 5:31 PM> Subject: Re: [TenTec] G5RV> > > >I don't consider myself an expert, but in my considerable experience with> > G5RVs and similar antennas, any G5RV can be improved by putting an antenna > > tuner> > between the coax and the balanced feedline. If that is done, the balanced> > feeder can be virtually any length at any frequency above 3.5 MHz.> >> > 73 Ray W2RS> >> >> > In a message dated 1/31/2009 8:47:18 P.M. GMT Standard Time,> > mathenyr at marietta.edu writes:> >> > The G5RV has been well reviewed by several experts. The best review I> > know of is by VE2CV and VE3KLO, in the ARRL Antenna Compendium Vol. 4.> >> > The long and the short of it is this: A G5RV is a 100 foot long piece of> > wire. The best way to feed that on multiple amateur bands would be with a> > multi-band matching network a selected point on the wire. Then the> > feedline (whatever type) would be in a matched condition and losses would> > be least. An automatic antenna tuner would be ideal for such purpose,> > mounted at wherever the feedpoint is to be located. If you can't put the> > tuner up there, well-made openwire line will come close in performance,> > with a proper tuner in the shack. You may have to trim the open-wire> > length to get an easy tune on all bands. But the antenna is a 100 foot> > piece of wire--with all the traits of any 100 foot piece of wire!> >> > Adding baluns, stubs, coax, etc. as is often shown will only add loss> > to the system. That loss is what improves the match on some bands!> >> > Pattern wise, that feedpoint mentioned above should be at the center if> > you want best results at 20 meters and below. If the higher bands are> > your favorite, then there may well be a better spot...perhaps at an end.> > But that will create other problems, and probably losses.> >> > The marvelious thing, however, is this: Despite all that one can> > find wrong with this "100 feet of wire" there are a gizilion and a half > > of> > these things out there making QSO's at this very second. It doesn't take> > a great antenna to make a lot of contacts.> >> > Ralph Matheny> > K8RYU> > 207 Gibbons Place> > Marietta Ohio 45750> > mathenyr at marietta.edu> >> >> >> >> >> >> >> >> > _______________________________________________> > TenTec mailing list> > TenTec at contesting.com> > http://lists.contesting.com/mailman/listinfo/tentec> >> >> > **************From Wall Street to Main Street and everywhere in between, > > stay> > up-to-date with the latest news. > > (http://aol.com?ncid=emlcntaolcom00000023)> > _______________________________________________> > TenTec mailing list> > TenTec at contesting.com> > http://lists.contesting.com/mailman/listinfo/tentec> > > > > _______________________________________________> TenTec mailing list> TenTec at contesting.com> http://lists.contesting.com/mailman/listinfo/tentec> > > **************From Wall Street to Main Street and everywhere in between, stay > up-to-date with the latest news. (http://aol.com?ncid=emlcntaolcom00000023)> _______________________________________________> TenTec mailing list> TenTec at contesting.com> http://lists.contesting.com/mailman/listinfo/tentec
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