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Total 16 documents matching your query.

1. Topband: Broadband vertical (score: 1): Author: "Barrie Smith" <barrie@centric.net>; Date: Mon, 4 Apr 2005 20:24:05 -0600; Hello All: I'm moving ahead with my plans to shunt feed a tower, and have it functional by next fall. A question occurs about how much of the 160 meter band can be covered when shunt-feeding. While m; /archives//html/Topband/2005-04/msg00033.html (7,034 bytes)
2. Re: Topband: Broadband vertical (score: 1): Author: Earl W Cunningham <k6se@juno.com>; Date: Tue, 5 Apr 2005 07:27:21 -0700; "A question occurs about how much of the 160 meter band can be covered when shunt-feeding." == The bandwidth of a shunt-fed vertical is about the same as a series-fed vertical. The closer the shunt-f; /archives//html/Topband/2005-04/msg00038.html (7,464 bytes)
3. Re: Topband: Broadband vertical (score: 1): Author: "Herbert Schoenbohm" <herbs@vitelcom.net>; Date: Tue, 5 Apr 2005 12:35:10 -0300; shunt-feeding. Barry, I found here that the bandwidth of a CLC network on a shunt fed top loaded 75 foot tower was too restrictive. 10 to 20 KHz without retuning. When I went to a wire cage spaced 3; /archives//html/Topband/2005-04/msg00042.html (7,458 bytes)
4. Re: Topband: Broadband vertical (score: 1): Author: "Howard Klein" <howk2@hotmail.com>; Date: Tue, 05 Apr 2005 21:02:47 +0000; A question occurs about how much of the 160 meter band can be covered when shunt-feeding. Is it possible to design a matching unit (perhaps a bit complex) that will cover most of the band (possibly a; /archives//html/Topband/2005-04/msg00044.html (7,762 bytes)
5. Re: Topband: Broadband vertical (score: 1): Author: Steve Lawrence <SMLX@earthlink.net>; Date: Tue, 5 Apr 2005 14:10:51 -0700; Here's my experience: 54 ft freestanding 3-section shunt fed tower. 15 elements from 3 antennas stacked on the mast. More than half of the elements as-built are DC isolated from the booms/mast. 3/8 i; /archives//html/Topband/2005-04/msg00045.html (8,084 bytes)
6. Re: Topband: Broadband vertical (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 5 Apr 2005 23:51:47 -0400; can be covered a series-fed Actually not unless the shunt system is a VERY thick or wide conductor. A shunt fed vertical has an additional resonant circuit formed by the series capacitor and the rea; /archives//html/Topband/2005-04/msg00048.html (9,188 bytes)
7. Re: Topband: Broadband vertical (score: 1): Author: ersmar@comcast.net; Date: Wed, 06 Apr 2005 14:24:09 +0000; Gents: My shunt wire consists of two parallel #14 wires separated from each other by 18 inches and held off the tower face two feet. I use several T's constructed of 3/4 inch PVC tubing as the suppor; /archives//html/Topband/2005-04/msg00052.html (8,341 bytes)
8. Re: Topband: Broadband vertical (score: 1): Author: Earl W Cunningham <k6se@juno.com>; Date: Wed, 6 Apr 2005 12:49:54 -0700; "Actually not unless the shunt system is a VERY thick or wide conductor." -- As much as I respect Tom's opinions, I have to disagree here. I know Tom doesn't necessarily believe in all modeling resul; /archives//html/Topband/2005-04/msg00055.html (9,057 bytes)
9. Re: Topband: Broadband vertical (score: 1): Author: Earl W Cunningham <k6se@juno.com>; Date: Wed, 6 Apr 2005 12:28:35 -0700; "My shunt wire consists of two parallel #14 wires separated from each other by 18 inches and held off the tower face two feet. Perhaps this arrangement is what helps my shunt-fed tower exhibit such a; /archives//html/Topband/2005-04/msg00056.html (8,123 bytes)
10. Re: Topband: Broadband vertical (score: 1): Author: Earl W Cunningham <k6se@juno.com>; Date: Wed, 6 Apr 2005 13:45:24 -0700; In a previous e-mail, I stated that a Swedish ham's two-wire shunt feed system increased his BW from 100 kHz to 110 kHz. That was in error. I revisited those model files and here are the corrected va; /archives//html/Topband/2005-04/msg00057.html (8,524 bytes)
11. Re: Topband: Broadband vertical (score: 1): Author: Herb Schoenbohm <herbs@vitelcom.net>; Date: Wed, 06 Apr 2005 20:09:23 -0400; My change from a single wire to a three wire cage unipole certainly made my antenna bandwidth useable. I think several NAB tech papers on this suggest that the copper wire cage also increases the ove; /archives//html/Topband/2005-04/msg00058.html (9,384 bytes)
12. Topband: Broadband vertical (score: 1): Author: "Randy Oates" <w6oar@gte.net>; Date: Wed, 06 Apr 2005 21:25:38 -0700; I agree with Herb 1000 % I also switch to cage feed antennas here on the high Desert because the ground out here is very poor . My verticals are 70 foot top loaded ( t ) with 62 radial on each of the; /archives//html/Topband/2005-04/msg00059.html (8,272 bytes)
13. Re: Topband: Broadband vertical (score: 1): Author: "Alan Downing" <alan.downing@homecall.co.uk>; Date: Thu, 7 Apr 2005 13:25:31 +0100; Hello gents Just checked the tower. 140Ft shunt fed tower free standing. Shunt fitted at 30ft. tapping point suggested by Earl. single wire shunt. 1800 = 1- 1.2 1825 = 1 -1.2 1850 = 1 - 1.1 1875 = 1; /archives//html/Topband/2005-04/msg00062.html (8,367 bytes)
14. Re: Topband: Broadband vertical (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 7 Apr 2005 10:22:06 -0400; antennas here on the high Desert because the ground out here is very poor . Changing to multiple drops won't do a single thing to change ground losses. Nothing, nill, zip. It only affects the genera; /archives//html/Topband/2005-04/msg00073.html (8,389 bytes)
15. Topband: Broadband vertical (score: 1): Author: "Randy Oates" <w6oar@gte.net>; Date: Thu, 07 Apr 2005 20:21:49 -0700; First ! Thank you all for your comments ... Now to explain the basis of my antenna . My first antenna for 160 when I moved to the high Desert was the first tower you saw on my web site . It is 90 fee; /archives//html/Topband/2005-04/msg00089.html (10,595 bytes)
16. Re: Topband: Broadband vertical (score: 1): Author: "Donald Chester" <k4kyv@hotmail.com>; Date: Sun, 10 Apr 2005 18:17:29 +0000; I may have already described my vertical on this board, but here it is again. I use a base-insulated Rohn 25G tower, 127' tall, with 120 quarter-wave radials buried just beneath the sod. At the 119'; /archives//html/Topband/2005-04/msg00106.html (8,989 bytes)

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