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1. Re: Topband: EZNEC Shunt Feed Model Gain (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Tue, 18 Aug 2009 16:12:21 -0700 (PDT); Hi George I have been modeling a 3 el vertical yagi over the rice paddy ground we have here in HS land and after tweaking everything got around 9 dBi of forward gain. After modeling a gamma match for; /archives//html/Topband/2009-08/msg00078.html (8,604 bytes)
2. Topband: QRN angle (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Sat, 5 Sep 2009 00:15:37 -0700 (PDT); That's interesting info Dave. Doing antenna modeling I notice that some directional configurations have two vertical back lobes the relative gain of which can be varied. At my QTH the main thundersto; /archives//html/Topband/2009-09/msg00020.html (7,170 bytes)
3. Topband: electrically shortening a tall grounded tower (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Fri, 25 Sep 2009 20:50:17 -0700 (PDT); Hi Is there any effective way to electrically shorten a tall grounded tower to 1/4 wave? I tried modeling a 1/4 wave cage surrounding the tower but it still shows a lot of current in the protruding s; /archives//html/Topband/2009-09/msg00116.html (7,047 bytes)
4. Re: Topband: electrically shortening a tall grounded tower (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Fri, 25 Sep 2009 22:10:47 -0700 (PDT); EZNEC 5. Regardless of my inability to model I would be interested in any practical solutions that have already been tried and known to work. Thanks 73Bob What software are you using? Often modeling; /archives//html/Topband/2009-09/msg00118.html (9,561 bytes)
5. Re: Topband: Web SDR's and 'Cheating' (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Thu, 10 Feb 2011 19:21:26 -0800 (PST); Seems to me like just another step from DX "U work em" nets and packet cluster spots. Why do we need to have an "ethical position" on this? Unless this technic is used to gain an advantage in a cont; /archives//html/Topband/2011-02/msg00084.html (9,618 bytes)
6. Re: Topband: Web SDR's and 'Cheating' (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Fri, 11 Feb 2011 22:46:43 -0800 (PST); Hi Dave, I'm not asking you (as a group I am taking the your usage of "us" to mean) to believe anything. My personal opinion is that ethics, integrity and honor are individual rather than absolute va; /archives//html/Topband/2011-02/msg00121.html (11,520 bytes)
7. Topband: coax cable counterpoise (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Sat, 24 Sep 2011 18:32:43 -0700 (PDT); Hi when I lived in the Mojave desert I fed my 70' crank up tower as a folded monopole on 160m and used 8 radials made from electric 1/4 waves of old coax cable laying on top of the ground. The center; /archives//html/Topband/2011-09/msg00132.html (7,312 bytes)
8. Re: Topband: tower vertical (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Thu, 29 Sep 2011 04:04:42 -0700 (PDT); Hi John The concrete is not an insulator. Connect a wire to the top and run it down about 2-3 feet out from and parallel to the tower and feed it with an L network against ground radials at the base.; /archives//html/Topband/2011-09/msg00144.html (8,130 bytes)
9. Re: Topband: coax cable counterpoise (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Mon, 3 Oct 2011 00:52:12 -0700 (PDT); Hi Terry well you certainly put lots of effort into that study thanks! As I recall I got the idea from a mid 70's Ham Radio or 73 mag article. But that was long before modeling software was around! A; /archives//html/Topband/2011-10/msg00003.html (12,898 bytes)
10. Topband: PL 259 for RG6 (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Fri, 7 Oct 2011 21:28:59 -0700 (PDT); Hi I will be using Comcast RG6 for my 4 square feed lines and the controller uses UHF connectors. Would crimp-on PL259 plugs sized for RG59 cable be suitable or is there a better way to go? Thanks Bo; /archives//html/Topband/2011-10/msg00036.html (6,707 bytes)
11. Topband: shorted stubs (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Tue, 18 Oct 2011 22:16:20 -0700 (PDT); Hi I was going to shunt each vertical element of my 4 square to ground via a 1/4 wave shorted stub of Commscope RG6 in order to provide a low impedance path to ground for DC and even harmonics. This; /archives//html/Topband/2011-10/msg00153.html (6,681 bytes)
12. Topband: more on the counterpoise (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Sat, 26 Nov 2011 21:08:05 -0800 (PST); This 1983 QST has some good info - http://www.w1npp.org/events/2010/2010-FieldDay/Antennas/HF-Vertical/8302020-Ground-systesm.pdf _______________________________________________ UR RST IS ... ... ..9; /archives//html/Topband/2011-11/msg00263.html (6,650 bytes)
13. Re: Topband: Adding a Ground to Elevated Feed Vertical? (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Tue, 29 Nov 2011 17:12:38 -0800 (PST); Hi I would leave the radials isolated from earth and add as many more as possible even very short ones. For the DC ground use an RFchoke or better a 1/4 wave shorted stub. __________________________; /archives//html/Topband/2011-11/msg00282.html (8,543 bytes)
14. Topband: HS top band allocation (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Tue, 7 Feb 2012 16:47:38 -0800 (PST); Hi I have confirmed that the 160m allocation for Thailand is presently 1800-1825 kHz, CW only and 200W max power output. There is legislation in progress to expand the allocation to the entire 200kHz; /archives//html/Topband/2012-02/msg00059.html (6,536 bytes)
15. Topband: ground radials (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Fri, 10 Feb 2012 22:09:48 -0800 (PST); Hi this study might be of interest to those wishing to optimize their ground system for various constraints. http://www.ncjweb.com/k3lcmaxgainradials.pdf _____________________________________________; /archives//html/Topband/2012-02/msg00140.html (6,659 bytes)
16. Topband: Fw: Choke Construction Info Needed (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Thu, 26 Jul 2012 18:53:47 -0700 (PDT); Hi Phil I'm no expert but plan to use a quarter wave shorted stub of RG6 at the feed point of my verticals for static drain and harmonic reduction, along with a spark gap in the event of a close stri; /archives//html/Topband/2012-07/msg00357.html (8,603 bytes)
17. Topband: elevated counterpoise and lightning (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Sun, 29 Jul 2012 18:03:47 -0700 (PDT); Hi in this thread I mentioned using a 1/4 wave shorted stub at the feed points of our 4 square for static drain. Since we want to farm the paddy land we will use a non-resonant counterpoise of 48 rad; /archives//html/Topband/2012-07/msg00393.html (6,918 bytes)
18. Re: Topband: elevated counterpoise and lightning (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Mon, 30 Jul 2012 14:25:07 -0700 (PDT); Yes we will put 2 ground rods below each element and a spark gap but the only galvanic connection to earth for the stubs (and through them the elements themselves) will be back through the 1/4 wave f; /archives//html/Topband/2012-07/msg00407.html (9,258 bytes)
19. Topband: Fw: FCP model (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Wed, 1 Aug 2012 20:41:33 -0700 (PDT); Very interesting discussion. Can't we quantify our ground systems by placing RF ammeters at the feed point? It would seem to me that once the current in the ground wire - whether it be attached to a; /archives//html/Topband/2012-08/msg00029.html (11,906 bytes)
20. Topband: "return" current - what is it? (score: 1): Author: Bob Kupps <n6bk@yahoo.com>; Date: Thu, 2 Aug 2012 23:59:52 -0700 (PDT); Hi it was recently stated that the antenna and ground return current at the feed point terminals (where let's assume the TX is located) must always be equal. And this certainly makes sense to me if w; /archives//html/Topband/2012-08/msg00050.html (7,494 bytes)

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