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Total 23 documents matching your query.

1. Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: Bob Tabke <bob@onehorsecreek.com>; Date: Mon, 15 Dec 2014 17:02:41 -0700; I'm new to 160 and am planning to add an 8-circle. I would like to buy commercial preamps and the controller. I would greatly appreciate any advice on the choice of preamp/controller vendor. I live i; /archives//html/Topband/2014-12/msg00258.html (7,941 bytes)
2. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 15 Dec 2014 22:23:55 -0500; - DXE wants a 320' diameter and Hi-Z wants 200' for optimum performance. It's hard to tell what DXE performance is because it does not disclose RDF, beam width or F/B. And neither vendor supplies EZN; /archives//html/Topband/2014-12/msg00264.html (10,054 bytes)
3. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Mon, 15 Dec 2014 20:09:12 -0800; The primary difference between DXE and Hi-Z 8 circle arrays is the fact that Hi-Z uses ALL 8 verticals actively at the same time where DXE uses only 4 at a direction. Using all 8 verticals allows the; /archives//html/Topband/2014-12/msg00265.html (10,311 bytes)
4. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 16 Dec 2014 07:51:45 -0500; Lee, We probably will just have to disagree about this. From my viewpoint, the behavior isn't too much different than a big yagi stack or other antennas we are used to. The size of the array generall; /archives//html/Topband/2014-12/msg00267.html (16,126 bytes)
5. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "Joel Harrison" <w5zn@w5zn.org>; Date: Tue, 16 Dec 2014 08:35:43 -0600; Greetings Bob & Reflector folks, Please allow me to provide a bit of my experience since I run both a broad side/end fire passive 8 vertical array (350 ft diameter) with a DXE controller AND a HiZ 8; /archives//html/Topband/2014-12/msg00268.html (12,188 bytes)
6. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "Joel Harrison" <w5zn@w5zn.org>; Date: Tue, 16 Dec 2014 08:42:12 -0600; Just to correct a typo, my HiZ 8 vertical array is spaced 200 ft, no 220 ft. www.w5zn.org _________________ Topband Reflector Archives - http://www.contesting.com/_topband; /archives//html/Topband/2014-12/msg00269.html (13,225 bytes)
7. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: Greg Zenger <n2gz@gregzenger.com>; Date: Tue, 16 Dec 2014 10:40:27 -0500; This thread comes at a good time for me, as I am planning an 8 circle array as we speak. My installation will be an 84' diameter circle as I intend to us it on both 160 and 80m. My installation will; /archives//html/Topband/2014-12/msg00270.html (14,323 bytes)
8. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 16 Dec 2014 09:27:29 -0800; On Tue,12/16/2014 6:35 AM, Joel Harrison wrote: Please allow me to provide a bit of my experience since I run both a broad side/end fire passive 8 vertical array (350 ft diameter) with a DXE controll; /archives//html/Topband/2014-12/msg00271.html (8,118 bytes)
9. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "JC" <n4is@comcast.net>; Date: Tue, 16 Dec 2014 13:01:34 -0500; Hi guys I would like to commented on the subject of RX comparison Tom when you introduced the RDF methodology to measure directivity, you really hit the nail in the head. I'm working on RX antennas o; /archives//html/Topband/2014-12/msg00272.html (18,643 bytes)
10. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Tue, 16 Dec 2014 10:52:57 -0800; Hi Guys, Excellent point Tom as we will have to disagree on this. I have built both types of arrays here and like the smaller circle with active elements. I believe it has a "cleaner" pattern. You ca; /archives//html/Topband/2014-12/msg00273.html (12,094 bytes)
11. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: bruce whitney via Topband <topband@contesting.com>; Date: Tue, 16 Dec 2014 13:15:53 -0800; Joel, This will be very interesting when you can report some comparative results on both these good receiving antennas. I am building - what I believe to be a somewhat novel antenna to try this seaso; /archives//html/Topband/2014-12/msg00274.html (15,927 bytes)
12. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Tue, 16 Dec 2014 20:50:33 -0500; A few comments based on my own experience with various receiving arrays: Circle diameter of the Hi-Z array: A circle diameter of 200 feet is specified for the Hi-Z 8-circle array on 160m. In fact, I; /archives//html/Topband/2014-12/msg00275.html (12,127 bytes)
13. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "Terry Posey" <tposey@nettally.com>; Date: Wed, 17 Dec 2014 10:57:09 -0500; Bravo, John! Well stated on all points. No disparaging comments noted. I especially appreciate your discussion of RDF and what it actually means in practice. As you commented, in practice, RDF is cal; /archives//html/Topband/2014-12/msg00276.html (12,894 bytes)
14. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Wed, 17 Dec 2014 11:42:20 -0800; Excellent discussion John and Terry. Interestingly enough if you take the 8 elements in a 200 foot circle you can optimize the peak RDF to nearly 15dB. M.T. Ma in his book outlines his math to optimi; /archives//html/Topband/2014-12/msg00277.html (15,411 bytes)
15. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Wed, 17 Dec 2014 12:18:58 -0800; All this discussion about RDF overlooks the issue of polarization. If you make an array of verticals with a certain RDF (assuming noise comes from all directions uniformly), the array will be better; /archives//html/Topband/2014-12/msg00278.html (9,523 bytes)
16. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Wed, 17 Dec 2014 20:58:55 -0500; Good points about polarization. If the signals and/or noise are polarized predominantly in one state, then RDF may not be a good predictor of SNR performance, particularly if the antenna receives pre; /archives//html/Topband/2014-12/msg00279.html (10,716 bytes)
17. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "JC" <n4is@comcast.net>; Date: Wed, 17 Dec 2014 23:11:10 -0500; Hi guys Polarization does play a lot on 160m for two reasons. I can say that because I am using my HWF (two horizontal flags end fire) since 2009. The first one is local man made noise that propagate; /archives//html/Topband/2014-12/msg00280.html (14,148 bytes)
18. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "JC" <n4is@comcast.net>; Date: Wed, 17 Dec 2014 23:43:45 -0500; I forgot to mention another very important development. My friend N8PR is experiencing with the WF in another level, Peter is using a rotator to turn the WF vertical to horizontal. He worked FT4TA on; /archives//html/Topband/2014-12/msg00281.html (20,384 bytes)
19. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: Don Moman VE6JY <ve6jy.1@gmail.com>; Date: Thu, 18 Dec 2014 04:53:02 +0000; Well I disagree that gain isn't important. Maybe you topbanders in the better areas of propagation can afford to throw away many db to get a better rdf, but that sure isn't the case up here in mid-no; /archives//html/Topband/2014-12/msg00282.html (17,052 bytes)
20. Re: Topband: 8 circle: DXE vs Hi-Z (score: 1): Author: "David Raymond" <daraymond@iowatelecom.net>; Date: Thu, 18 Dec 2014 00:00:56 -0600; My experience is similar to Don's outlined below. Both gain and noise figure are important in very low noise environments. In my own case, I have a noise floor from my TX array in the high -120s or -; /archives//html/Topband/2014-12/msg00283.html (12,685 bytes)

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