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101. R: Topband: Re: ON4UN Antenna (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sat, 16 Oct 1999 15:07:01 +0200; Nothing prohibits an iron powdered toroidal core to be used, but like in many other applications the circuit Q is what counts and a coil wound over an iron powdered core probably far exceed requireme; /archives//html/Topband/1999-10/msg00097.html (7,117 bytes)
102. R: Topband: losses on beverages (score: 1): Author: Maurizio Panicara" <i4jmy@iol.it (Maurizio Panicara); Date: Sun, 17 Oct 1999 11:08:54 +0200; I'm not so much convinced of this testing method, comparing procedure and final conclusions. SWR changes replacing coil the tranformer core material only show that one of the 2 wasn't done correctly.; /archives//html/Topband/1999-10/msg00104.html (7,544 bytes)
103. R: Topband: losses on beverages (score: 1): Author: Maurizio Panicara" <i4jmy@iol.it (Maurizio Panicara); Date: Sun, 17 Oct 1999 11:09:05 +0200; The single wire beverage is terminated at the transformer edge and the load is the receiver through the coaxial line and the unbalanced step up transformer. The 2 wire beverage were one end is open a; /archives//html/Topband/1999-10/msg00105.html (7,476 bytes)
104. R: Topband: Beverage Improvements? (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Wed, 20 Oct 1999 19:58:26 +0200; Unless ground is so poor to override the terminating resistor amount the effect of improving ground at terminated end is minimal. A better, confortable and cheaper result could be find trying differe; /archives//html/Topband/1999-10/msg00128.html (6,853 bytes)
105. R: Topband: Beverage Questions (score: 1): Author: Maurizio Panicara" <i4jmy@iol.it (Maurizio Panicara); Date: Sun, 5 Sep 1999 19:21:01 +0200; You can consistently vary the direction but the final resultant will be the average orientation of the wire. Once I used a curved beverage similar to an arc of circle (some 15 degrees) and it really; /archives//html/Topband/1999-09/msg00012.html (7,193 bytes)
106. R: Topband: Beverage help please and VK6 DX. (score: 1): Author: Maurizio Panicara" <i4jmy@iol.it (Maurizio Panicara); Date: Tue, 14 Sep 1999 08:37:31 +0200; A wire, as small as you like, works. Since small wires breaks, and they do it in the worst moment, you could limit the small wire to a section of the Beverage and not to it's full length. Upon the im; /archives//html/Topband/1999-09/msg00064.html (7,180 bytes)
107. R: Topband: 1/2 Wave L Antenna (score: 1): Author: Maurizio Panicara" <i4jmy@iol.it (Maurizio Panicara); Date: Thu, 5 Aug 1999 21:33:32 +0200; Thom, did you measure the feed point impedance ? I doubt this antenna is electrically an half wave one, it's probably a sort of quarter wave vertical radiator with a top loading (the sloping wire). T; /archives//html/Topband/1999-08/msg00013.html (7,395 bytes)
108. Topband: R: (score: 1): Author: Maurizio Panicara" <i4jmy@iol.it (Maurizio Panicara); Date: Fri, 23 Apr 1999 12:52:31 +0200; About line: First of all, a low loss TV coax cable is not necessarily better (or is only marginally better) than an RG58. This happens because at low frequencies the losses are mainly due to conducto; /archives//html/Topband/1999-04/msg00092.html (8,236 bytes)
109. R: Topband: Re: Phased Beverages (score: 1): Author: Maurizio Panicara" <i4jmy@iol.it (Maurizio Panicara); Date: Sat, 24 Apr 1999 22:37:34 +0200; In many years of RF transformers design and testing, it never occurred to me a single combiner, or impedance transformer, performing like it should out of the range of few octaves. With some (heavy); /archives//html/Topband/1999-04/msg00099.html (7,380 bytes)
110. Re:Topband: Assistance Needed (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>; Date: Fri, 24 Oct 2003 17:30:55 +0200; Hi Dave, my opinions filled beween lines. Ø 1. Full-Wave vertical loop - what should be the configuration? Probably the easiest (because of the single support) is a vertical triangle, feeded a; /archives//html/Topband/2003-10/msg00144.html (7,878 bytes)
111. Re:Topband: Radiation from Ends of Beverage (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>; Date: Thu, 18 Dec 2003 10:08:25 +0100; -- Initial Header -- To : "Tom Rauch" w8ji@contesting.com,"Topband Reflector" topband@contesting.com Cc : Date : Wed, 17 Dec 2003 16:02:29 +1000 Subject : Topband: Radiation from Ends of Beverage Hi; /archives//html/Topband/2003-12/msg00139.html (8,345 bytes)
112. Re:Topband: Non-inductive resistors (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>; Date: Thu, 18 Dec 2003 22:16:33 +0100; Anything has inducvtance/reactance, and a small inductive reactance is not affecting the beverage at all. Standard film resistors, few turns of resistive metal film compound laying on a very small di; /archives//html/Topband/2003-12/msg00145.html (8,302 bytes)
113. Re:Topband: Stew Perry contest ideas (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>; Date: Mon, 22 Dec 2003 13:38:55 +0100; I never operated 160m from west coast, but I think sunrise-sunset hours are quite important ones if the setup is enough for extra domestic traffic. Beeing the Stew Perry a QRB contest, I'd prefer not; /archives//html/Topband/2003-12/msg00181.html (7,446 bytes)
114. Re: Topband: 160 Meter BALUNS (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>; Date: Tue, 23 Dec 2003 09:51:50 +0100; RG8X is a fancy name chosen for commercial reasons and is not an official code for a qualified cable like other RGs. All foam cables without a rigid shield and a rigid jacket are infact very question; /archives//html/Topband/2003-12/msg00189.html (9,214 bytes)
115. Re: Topband: 160 Meter BALUNS (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>; Date: Tue, 23 Dec 2003 15:59:58 +0100; Everyone has his own experiences, mine are different. Stated it, polyethylene is a thermoplastic material, foam PE also a good thermal insulator. High density compact polyethylene softens around 248&; /archives//html/Topband/2003-12/msg00197.html (8,264 bytes)
116. Re: Topband: 160 Meter BALUNS (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>(by way of Bill Tippett<btippett@alum.mit.edu>); Date: Wed, 24 Dec 2003 06:34:53 -0500; Thanks to Bill post it occurred to me that's worth to point out that power rating of classical balun decreases dramatically in case of high SWR. I've seen a number of commercial ferrite, nominally 2K; /archives//html/Topband/2003-12/msg00205.html (8,749 bytes)
117. Re:Topband: beverage impedance (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>; Date: Wed, 24 Dec 2003 16:19:08 +0100; The SWR flatness is not a bad choice. Most practical method is to chose a termination in such a way the impedance fluctuation (SWR) with frequency is minimal. For other purposes than measuring a bev; /archives//html/Topband/2003-12/msg00209.html (7,831 bytes)
118. Re:Topband: Two Wire Beverage Question (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>; Date: Thu, 25 Dec 2003 20:54:36 +0100; No Tracey, one wire above the other works fine. Theorically it might work better if you cross the wires repatedly (the latter valid also for horizontal placement of wires). 73 & Merry Christmas _____; /archives//html/Topband/2003-12/msg00216.html (7,378 bytes)
119. Re:Topband: TOPBAND : Antenna reception 160/80 ? (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>; Date: Fri, 26 Dec 2003 00:03:58 +0100; Didier, a one WL beverage is not a bad antenna at all, moreover You might try phasing two of them for 80m. About 160m, I'd suggest a 4 square receiving array. If You understand italian language take; /archives//html/Topband/2003-12/msg00218.html (7,823 bytes)
120. Re:Fw: Topband: DX window? (score: 1): Author: "i4jmy@iol.it" <i4jmy@iol.it>; Date: Sun, 28 Dec 2003 18:40:35 +0100; Be realistic Josep, contest rules are issued by the contest organizer/s but sooner or later they turn to express the will of entrants, i mean the majority of them, unless already they do. Those ?rule; /archives//html/Topband/2003-12/msg00238.html (9,733 bytes)

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