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1. Topband: Re: INV L Recptn. (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Sat, 9 Nov 2002 15:46:52 -0600; Asked, "Do I have to orient the horizontal section of my inverted L into another direction to copy EUROPE or AFRICA signals?" An INV L has directivity in the direction opposite the horizontal section; /archives//html/Topband/2002-11/msg00033.html (6,602 bytes)
2. Topband: Re: Short Monopoles (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Mon, 11 Nov 2002 08:37:59 -0600; Asked, "I need information (pref. www links or other sources) describing short monopoles using multiple wires connected to it's top and fed in phase for increase in radiation resistance. (Used in LF/; /archives//html/Topband/2002-11/msg00047.html (6,588 bytes)
3. Topband: Re: N4XX coaxial inv L (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Tue, 12 Nov 2002 17:36:08 -0500; What is supposed to be the advantage of this antenna over a wire version? TNX, Roy K6XK; /archives//html/Topband/2002-11/msg00060.html (6,200 bytes)
4. Topband: Re: QRNN on 160 (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Mon, 20 May 2002 11:55:34 -0500; About: "I am now in my second year of trying to get the local power company to make it somewhat less noisy here." ...(etc.) The best approach I ever found was to get past the blonde screener (if she; /archives//html/Topband/2002-05/msg00140.html (6,925 bytes)
5. Topband: Re: Top fed vert (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Wed, 1 Aug 2001 07:43:30 -0500; Concerning, "It would also mean that I should not be=20 able to force a current point aloft...(etc.)" Can you 'force a current point' at the open end of an antenna element? 73, Roy K6XK/0 -- FAQ on W; /archives//html/Topband/2001-08/msg00002.html (6,557 bytes)
6. Topband: Re: Top fed vertical (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Tue, 31 Jul 2001 08:31:39 -0500; About, "I like top feeding because the current is higher above ground. This gives a better shot over high, thick trees...etc." The current distribution in a given antenna element is independent upon; /archives//html/Topband/2001-07/msg00083.html (6,792 bytes)
7. Topband: Re: INV L matching (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Mon, 29 Jan 2001 11:36:06 -0600; W4NF: First, it's 25 ohms. And a simple shunt fed inductor at the feedpoint is very simple, easy and cheap to construct and adjust there. Also known as a Z match, it connects across the feedpoint wit; /archives//html/Topband/2001-01/msg00255.html (7,087 bytes)
8. Topband: Re: Balloon Sources (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Sun, 31 Dec 2000 08:08:35 -0600; How about using a cluster of very large sized yard leaf bags? Cheap/disposable/light weight/low pressure (for max lift). Just seal them with household plastic tape. Yes, ugly. K6XK -- FAQ on WWW: htt; /archives//html/Topband/2000-12/msg00197.html (6,691 bytes)
9. Topband: Re: radial wire material (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Fri, 11 Aug 2000 09:55:40 -0500; I have seen buried aluminum turn into white powder fairly rapidly when buried. 73, Roy K6XK -- FAQ on WWW: http://www.contesting.com/FAQ/topband Submissions: topband@contesting.com Administrative re; /archives//html/Topband/2000-08/msg00036.html (6,553 bytes)
10. Topband: Re: Short Vert (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Wed, 1 Dec 1999 14:18:48 -0600; "I believe he claims around 94 or 97 percent efficiency." Quoting N5NUG's recent post: "radiation resistance is 9 -10 ohms at best" This means that in order to achieve even 50% efficiency in the grou; /archives//html/Topband/1999-12/msg00019.html (6,895 bytes)
11. Topband: Re: Folded Unipole vs Series Fed Vertical (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Wed, 15 Dec 1999 08:46:59 -0600; One semi redeeming feature is that a shorter than quarter wave version can be resonated conveniently and efficiently with a simple series cap at the feedpoint. 73, Roy K6XK -- FAQ on WWW: http://www.; /archives//html/Topband/1999-12/msg00131.html (6,814 bytes)
12. Topband: Re: Folded Unipole vs Series Fed Antenna (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Wed, 15 Dec 1999 16:07:32 -0600; Hi Gary, No, that is one of the neat things about a folded unipole, the sine of the reactance is reversed from that of a series fed antenna element. The short folded unipole can be viewed as being a; /archives//html/Topband/1999-12/msg00142.html (7,596 bytes)
13. Topband: Re: Folded Unipole vs Series Fed Antenna (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Thu, 16 Dec 1999 08:57:34 -0600; "A shortened hairpin monopole is never as efficient as a reasonably well constructed top-hat loaded antenna of the same height..." Of course, you can have the best of both worlds: a shortened hairpin; /archives//html/Topband/1999-12/msg00160.html (7,506 bytes)
14. Topband: Re: TopBand GAP (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Sat, 18 Dec 1999 11:17:43 -0600; "I'll take a 3/8 wave Inv-L." A 3/8 compared to a 1/4 wave INV L only pushes the current portion up farther into the undesireable horizontal part of the element. (Unless you have it very high wavelen; /archives//html/Topband/1999-12/msg00192.html (6,600 bytes)
15. Topband: Re: Short Vertical... (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Mon, 29 Nov 1999 17:42:18 -0600; Re: "I need some info...ideas...for a short vertically polarized antenna. Vertical height limitation of 45'" I find a short, folded unipole (also called a hairpin) works well. It has NO loading coil,; /archives//html/Topband/1999-11/msg00205.html (7,469 bytes)
16. Topband: Re: Multi-Band INV L (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Mon, 29 Nov 1999 18:15:58 -0600; "Long ago I picked up a (hefty) 80-meter trap, intended for a 160/80 meter dipole. I'm thinking of inserting it in the horizontal wire with some appropriate trimming to provide coverage on both bands; /archives//html/Topband/1999-11/msg00206.html (6,768 bytes)
17. Topband: Re: Short Vert--Tom R... (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Tue, 30 Nov 1999 14:20:03 -0600; Tom, regarding, "The "radiation resistance improvement" of a folded element is a myth that unfortunately even appears in some west coast handbooks" Yes, yes, I know that very well--I have posted stat; /archives//html/Topband/1999-11/msg00215.html (7,098 bytes)
18. Topband: Re: Short Vertical... (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Tue, 30 Nov 1999 16:50:06 -0600; "You are correct about top loading a folded unipole. The Uni-Hat CTSVR uses a large top hat for loading a folded unipole. The skirt system is also used to match the feed line to the antenna using thr; /archives//html/Topband/1999-11/msg00217.html (8,649 bytes)
19. Topband: Re: INV L (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Sat, 2 Oct 1999 16:08:38 -0500; "What will be the best length for an Inverted L antenna;" I think a resonant quarter wave is best, because it has the most high-current portion of the element in the vertical plane. It's easy to matc; /archives//html/Topband/1999-10/msg00015.html (6,754 bytes)
20. Topband: Re: ON4UN Antenna (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Fri, 15 Oct 1999 14:37:20 -0500; How about using an Amidon T-400-A powdered iron toroid core up there to shrink the physical size and wire length? 73, Roy K6XK -- FAQ on WWW: http://www.contesting.com/topband.html Submissions: topba; /archives//html/Topband/1999-10/msg00095.html (7,116 bytes)

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