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#1
April 19th 04, 07:42 PM
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G5RV.... feed
Hi There,
I wonder if there is a better way to feed my 1/2 size G5RV...... At the moment I am using it portable with the apex at 30 feet and the ends sloping down to 3 feet above ground ............the DX location is around 250 mtrs ASL. It is fed by 300ohm ladder connected to 20 feet of 50 ohm coax. is this the best way to feed it I have heard that just using ladder line is better/more eficient... I would be gratefull for any plans or suggestions on how to feed this or plans of other more efficient/easy set ups for portable "WIRE" antenna set ups as I like to make my own antennas .... I would like to over come the qrp operating by hight and antenna eficiency... Thxs for any suggestions...... Tony M3TOE. |
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#2
April 19th 04, 07:57 PM
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On Mon, 19 Apr 2004 19:42:27 +0100, "TonyWard"
wrote: Hi There, I wonder if there is a better way to feed my 1/2 size G5RV...... At the moment I am using it portable with the apex at 30 feet and the ends sloping down to 3 feet above ground ............the DX location is around 250 mtrs ASL. It is fed by 300ohm ladder connected to 20 feet of 50 ohm coax. is this the best way to feed it I have heard that just using ladder line is better/more eficient... I would be gratefull for any plans or suggestions on how to feed this or plans of other more efficient/easy set ups for portable "WIRE" antenna set ups as I like to make my own antennas .... I would like to over come the qrp operating by hight and antenna eficiency... Thxs for any suggestions...... Tony M3TOE. I recently lengthened my 44-ft dipole to 51 feet, so it is a 1/2-size "g5rv". I feed it with 42 feet of 450-ohm line, because that is what it takes to get to my window. To transition to my tuner, I have a coax choke balun at the window. With the tuner, I can work all bands from 40 thru 10, except for 15 meters, where the swr is a little high. Whether this is better or worse than what you have, I couldn't say, but it does work. I suspect your antenna would work fine, fed entirely with 300-ohm line. Bob k5qwg |
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#3
April 19th 04, 08:05 PM
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Reg has a program called "Dipole 3" that will show you the relative
efficiencies of each set up. http://www.btinternet.com/~g4fgq.regp/ JD "TonyWard" wrote in message ... Hi There, I wonder if there is a better way to feed my 1/2 size G5RV...... At the moment I am using it portable with the apex at 30 feet and the ends sloping down to 3 feet above ground ............the DX location is around 250 mtrs ASL. It is fed by 300ohm ladder connected to 20 feet of 50 ohm coax. is this the best way to feed it I have heard that just using ladder line is better/more eficient... I would be gratefull for any plans or suggestions on how to feed this or plans of other more efficient/easy set ups for portable "WIRE" antenna set ups as I like to make my own antennas .... I would like to over come the qrp operating by hight and antenna eficiency... Thxs for any suggestions...... Tony M3TOE. |
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#4
April 20th 04, 12:49 AM
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There is no such thing as a half sized G5RV.
Dan/W4NTI "TonyWard" wrote in message ... Hi There, I wonder if there is a better way to feed my 1/2 size G5RV...... At the moment I am using it portable with the apex at 30 feet and the ends sloping down to 3 feet above ground ............the DX location is around 250 mtrs ASL. It is fed by 300ohm ladder connected to 20 feet of 50 ohm coax. is this the best way to feed it I have heard that just using ladder line is better/more eficient... I would be gratefull for any plans or suggestions on how to feed this or plans of other more efficient/easy set ups for portable "WIRE" antenna set ups as I like to make my own antennas .... I would like to over come the qrp operating by hight and antenna eficiency... Thxs for any suggestions...... Tony M3TOE. |
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#5
April 20th 04, 01:19 AM
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On Mon, 19 Apr 2004 23:49:08 GMT, "Dan/W4NTI" w4nti@get rid of this
mindspring.com wrote: There is no such thing as a half sized G5RV. Dan/W4NTI You haven't read Mr. Varney's article. He talks about not only a half-size, but a double size. Bob k5qwg |
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#6
April 20th 04, 03:06 AM
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Bob Miller wrote:
On Mon, 19 Apr 2004 23:49:08 GMT, "Dan/W4NTI" w4nti@get rid of this mindspring.com wrote: There is no such thing as a half sized G5RV. Dan/W4NTI You haven't read Mr. Varney's article. He talks about not only a half-size, but a double size. As does the G5RV Application Note from Antennas West. -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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#7
April 20th 04, 07:03 AM
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Tony,
What you heard about feeding a 'G5RV' more efficiently with some type of 'ladder' line is correct. 'More efficient' is relative though. Just for 'grins', the 'ASL' height is sort of meaningless for DX or local, makes little difference, in general. 'AGL' does make a difference, since it is one of the factors which will shape radiation pattern, impedance, etc. (If it's a choice between a (+) ASL and a (-) ASL, I think I'd take the (+) one.) 'Doc |
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#8
April 20th 04, 06:51 PM
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cheers for that link sir its very usefull.....
"KA9CAR" wrote in message ... Reg has a program called "Dipole 3" that will show you the relative efficiencies of each set up. http://www.btinternet.com/~g4fgq.regp/ JD "TonyWard" wrote in message ... Hi There, I wonder if there is a better way to feed my 1/2 size G5RV...... At the moment I am using it portable with the apex at 30 feet and the ends sloping down to 3 feet above ground ............the DX location is around 250 mtrs ASL. It is fed by 300ohm ladder connected to 20 feet of 50 ohm coax. is this the best way to feed it I have heard that just using ladder line is better/more eficient... I would be gratefull for any plans or suggestions on how to feed this or plans of other more efficient/easy set ups for portable "WIRE" antenna set ups as I like to make my own antennas .... I would like to over come the qrp operating by hight and antenna eficiency... Thxs for any suggestions...... Tony M3TOE. |
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