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#1
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Metal Roof and Vertical Antenna
I posted this on the wrong newsgroup a few days ago and no one has answered,
so I'll try here. I have a Butternut Vertical (as a secondary antenna) and a regular radial system set up with it. I also have a metal roof on my house (here in the country in Western Washington). I have been wondering if I can use the metal roof as the radial system/ground plane for this antenna. Haven't tried it yet. Would this work or would it detune the antenna? What do you guys think? Rod KI7CQ |
#2
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On Fri, 23 Sep 2005 11:38:03 -0700, "Rod Maupin"
wrote: Would this work or would it detune the antenna? Hi Rod, It would be simpler to just do it and see what happens. The worst that comes of it is that the metal roof needs the sections electrically bonded together. Not so much as a "ground plane" as to reduce corroded connections (by bridging and shorting them) that act as semiconductors and thus give rise to spurious emissions. Any elevation removes your antenna from the deadly embrace of lossy ground. 73's Richard Clark, KB7QHC (also Western WA, Seattle) |
#3
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I think you are right, Richard. I'll just do it and see what happens. The
thing is the roof is a painted metal, so I'm curious if there is continuity between the sections. Thanks Richard. By the way, I live in Rainier, down by Olympia. Rod |
#4
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I have a Butternut Vertical (as a secondary antenna) and a regular radial
system set up with it. I also have a metal roof on my house (here in the country in Western Washington). I have been wondering if I can use the metal roof as the radial system/ground plane for this antenna. Haven't tried it yet. Would this work or would it detune the antenna? I did that once with a HF6V and a metal roof about 40' above ground. It seemed to work fairly well. The tuning on the Butternut is fairly touchy on several bands, so yes, you will probably need to retune it between roof mounting or ground mounting (I did). Tor N4OGW |
#5
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Thanks Tor. I have the same antenna, an HF6V. You're right. It is touchy
on some of the bands. Rod |
#6
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Rod Maupin wrote:
I think you are right, Richard. I'll just do it and see what happens. The thing is the roof is a painted metal, so I'm curious if there is continuity between the sections. Thanks Richard. By the way, I live in Rainier, down by Olympia. Rod Rod; Assume not and you will not make an Ass of you and me. Bond the individual segments and let us know how it works. Dave WD9BDZ |
#7
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Try an antenna tuner to balance it out.
gene "Rod Maupin" wrote in message ... Thanks Tor. I have the same antenna, an HF6V. You're right. It is touchy on some of the bands. Rod |
#8
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It will work, but you have to treat the roof as a psuedo
mobile setup, as it's not resonant. Well... Unless you get lucky. I'd just ohm out the roof and see if it's connected before I started trying to bond it together. The performance is semi iffy... In general, radials that are resonant would be better, but that assumes there are enough of them for a given height. It's quite possible some bands may be fairly poor, if the roof shows a high impedance. IE: much like trying to use 1/2 wave long radials elevated... MK |
#9
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I have a Fluidmotion BiggIR on a 3500 sq ft peaked aluminum roof.
Feedpoint impedance near 50 ohms at resonance can be achieved in such a configuration. 73 H. NQ5H wrote in message ups.com... It will work, but you have to treat the roof as a psuedo mobile setup, as it's not resonant. Well... Unless you get lucky. I'd just ohm out the roof and see if it's connected before I started trying to bond it together. The performance is semi iffy... In general, radials that are resonant would be better, but that assumes there are enough of them for a given height. It's quite possible some bands may be fairly poor, if the roof shows a high impedance. IE: much like trying to use 1/2 wave long radials elevated... MK |
#10
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In article ,
"Rod Maupin" wrote: I posted this on the wrong newsgroup a few days ago and no one has answered, so I'll try here. I have a Butternut Vertical (as a secondary antenna) and a regular radial system set up with it. I also have a metal roof on my house (here in the country in Western Washington). I have been wondering if I can use the metal roof as the radial system/ground plane for this antenna. Haven't tried it yet. Would this work or would it detune the antenna? What do you guys think? Rod KI7CQ Rod, Several years ago I tried a 14AVQ vert next to the house with a big jumper to the tin roof. Boy was that a mistake! It did not work at all. I gave up on the vert and installed a tower and beam. FYI, the best improvement ever made to the beam was when we replaced the tin roof with normal singles. It was like getting a new antenna too. Good luck with the tin roof. BTW, it did work pretty good with a mag mount VHF/UHF antenna. HiHi Dick AA5VU |
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