Comments on: My homebrew vertical multiband hf antenna http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna Blog and website of a Belgian ham radio operator who likes to build antennas and other projects. Fri, 09 Dec 2011 15:20:32 +0000 hourly 1 http://wordpress.org/?v=3.1.1 By: Neil McGrath http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna/comment-page-1#comment-361 Neil McGrath Sun, 01 May 2011 10:50:37 +0000 http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna#comment-361 I have now completed some modifications to my version of the multi-band vertical. The details can be found at www.g7aqk.co.uk. Neil G7AQK I have now completed some modifications to my version of the multi-band vertical. The details can be found at http://www.g7aqk.co.uk.

Neil
G7AQK

]]> By: Ken Carr / KB1AWV http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna/comment-page-1#comment-356 Ken Carr / KB1AWV Tue, 19 Apr 2011 15:05:03 +0000 http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna#comment-356 You have a very nice description of your experimental antennas. More people should share this way. Is the photograph of the fan dipole showing it in test position? I suspect it would work better if it was elevated at least 1/4 wave for the lowest band. -I don't experiment as much these days. I will be putting up a Gap Titan soon. I had one before and it worked well, especially with a small amplifier.- You have a very nice description of your experimental antennas. More people should share this way.
Is the photograph of the fan dipole showing it in test position? I suspect it would work better if it was elevated at least 1/4 wave for the lowest band.
-I don’t experiment as much these days. I will be putting up a Gap Titan soon. I had one before and it worked well, especially with a small amplifier.-

]]> By: Bob Henderson (GM4DTJ) http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna/comment-page-1#comment-107 Bob Henderson (GM4DTJ) Thu, 28 Oct 2010 18:54:22 +0000 http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna#comment-107 I have built and used for about 8 months now,a cobwebb to the original spec and I am delighted with it's performance now that the bands are opening up again. Bob. GM4DTJ I have built and used for about 8 months now,a cobwebb to the original spec and I am delighted with it’s performance
now that the bands are opening up again.

Bob. GM4DTJ

]]> By: Gordon http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna/comment-page-1#comment-40 Gordon Tue, 12 Aug 2008 11:01:56 +0000 http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna#comment-40 I made a similar vertical a few years ago using a fishing pole with wires held around it. It was mounted on the side of a house with elevated radials and it worked very well. It was only for three bands, 10m 15m 20m. Gordon GM4SVM I made a similar vertical a few years ago using a fishing pole with wires held around it. It was mounted on the side of a house with elevated radials and it worked very well. It was only for three bands, 10m 15m 20m.

Gordon

GM4SVM

]]> By: Sai http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna/comment-page-1#comment-38 Sai Fri, 01 Aug 2008 05:15:02 +0000 http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna#comment-38 Real good info on antenna my friend thanks for sharing. Hope to see u on air ...................73 de VU2SGW clear Real good info on antenna my friend thanks for sharing. Hope to see u on air ……………….73
de VU2SGW clear

]]> By: Neil G7AQK http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna/comment-page-1#comment-36 Neil G7AQK Fri, 20 Jun 2008 21:54:51 +0000 http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna#comment-36 I tuned up the antenna initially using just the counterpoise and it matched reasonably well. Attaching the earth improves things marginally but not much. I did find that trimming the length of the counterpoise for minimum SWR was much easier than adjusting the length of the radiator. The counterpoise wires run along the fence approx 150-300mm above the ground. The earth is connected to a 4 ft earth rod and the metal fence spikes supporting the boundary fence. I might try the two wire suggestion or even use two counterpoises of slightly different lengths. Neil I tuned up the antenna initially using just the counterpoise and it matched reasonably well. Attaching the earth improves things marginally but not much. I did find that trimming the length of the counterpoise for minimum SWR was much easier than adjusting the length of the radiator. The counterpoise wires run along the fence approx 150-300mm above the ground. The earth is connected to a 4 ft earth rod and the metal fence spikes supporting the boundary fence. I might try the two wire suggestion or even use two counterpoises of slightly different lengths.

Neil

]]> By: Joost http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna/comment-page-1#comment-35 Joost Fri, 20 Jun 2008 19:49:57 +0000 http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna#comment-35 Hi Neil, I just measured the bandwidth on 10 again. The 2:1 points are 28.603 and 29.607. My initial readings a year ago were more in the neighbourhood of 700 to 800 kHz (for what I can remember) . Strange effect :-) What about using 2 wires on 10 ? One tuned to 28.000 and the other to 29.500. I never tried it but who knows ? Or a alu tube instead of a wire ? I see that you have a ground stake, I don't have one on my roof, but it seems to be working. Hi Neil,

I just measured the bandwidth on 10 again. The 2:1 points are 28.603 and 29.607. My initial readings a year ago were more in the neighbourhood of 700 to 800 kHz (for what I can remember) . Strange effect :-)

What about using 2 wires on 10 ? One tuned to 28.000 and the other to 29.500. I never tried it but who knows ? Or a alu tube instead of a wire ?
I see that you have a ground stake, I don’t have one on my roof, but it seems to be working.

]]> By: Neil G7AQK http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna/comment-page-1#comment-34 Neil G7AQK Fri, 20 Jun 2008 19:30:24 +0000 http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna#comment-34 I have just found your site and was particularly interested in your multi-band vertical. I came up with a very similar solution about a year ago and the details can be found at http://g7aqk.uk.googlepages.com/Fantenna.pdf . I have improved the initial design by running a single 1/4 wave counterpoise horizontally for each band in addition to the earth connection. Bandwidth is OK for most of the bands but only covers about 500KHz of 10m. Neil I have just found your site and was particularly interested in your multi-band vertical. I came up with a very similar solution about a year ago and the details can be found at http://g7aqk.uk.googlepages.com/Fantenna.pdf . I have improved the initial design by running a single 1/4 wave counterpoise horizontally for each band in addition to the earth connection. Bandwidth is OK for most of the bands but only covers about 500KHz of 10m.

Neil

]]> By: Tony G0WFV http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna/comment-page-1#comment-33 Tony G0WFV Mon, 26 May 2008 12:29:38 +0000 http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna#comment-33 The current antenna system is deaf! I am unsure weather this is due to location or construction. As I can do little about the location, I can alter the construction so as to be sure I have kept to the original CobWebb spec as possible. The current antenna system is deaf! I am unsure weather this is due to location or construction. As I can do little about the location, I can alter the construction so as to be sure I have kept to the original CobWebb spec as possible.

]]> By: Mart http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna/comment-page-1#comment-30 Mart Sun, 18 May 2008 14:25:29 +0000 http://on3jt.byze.be/my-homebrew-vertical-multiband-hf-antenna#comment-30 Tony, do you want to use better cable because you want to use more power or it is better for reception also? Tony, do you want to use better cable because you want to use more power or it is better for reception also?

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