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1. Topband: two wires Beverage (score: 1): Author: "Ryszard Tymkiewicz" <rtym@ippt.gov.pl>; Date: Tue, 27 Jul 2004 07:33:53 +0200; A few days ago I saw a discussion here about switchable-direction beverages. Andrei RA6LBS described his antenna made from twin-lead twisted wires which were used in military telephone systems.The si; /archives//html/Topband/2004-07/msg00062.html (6,968 bytes)
2. Re: Topband: two wires Beverage (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 27 Jul 2004 09:49:12 -0500; When you're thinking about the impedance, remember that this is the impedance of that line when used as a twisted pair transmission line. That will NOT be the impedance of a Beverage antenna that you; /archives//html/Topband/2004-07/msg00063.html (8,012 bytes)
3. Re: Topband: two wires Beverage (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 27 Jul 2004 13:54:33 -0400; With a twisted wire, the user would have to be concerned with loss in the line and performance changes between wet and dry weather including impedance changes. I don't know if this line has conductor; /archives//html/Topband/2004-07/msg00066.html (8,092 bytes)
4. RE: Topband: two wires Beverage (score: 1): Author: "Ragnar Otterstad" <otterstad@enter.vg>; Date: Tue, 27 Jul 2004 20:57:55 +0200; When you're thinking about the impedance, remember that this is the impedance of that line when used as a twisted pair transmission line. That will NOT be the impedance of a Beverage antenna that yo; /archives//html/Topband/2004-07/msg00067.html (7,906 bytes)
5. Re: Topband: two wires Beverage (score: 1): Author: "Jacques RAMBAUD" <f6bki@wanadoo.fr>; Date: Tue, 27 Jul 2004 19:39:22 -0000; Rys want to use this twested military telephone line for a two wire beverage , I agree Jim, on one direction the impedance between the two wires and the ground will be more or less the same as with a; /archives//html/Topband/2004-07/msg00068.html (9,644 bytes)
6. RE: Topband: two wires Beverage (score: 1): Author: "Joe Subich, K4IK" <k4ik@subich.com>; Date: Tue, 27 Jul 2004 18:40:52 -0400; Jacques, Other than the possible impedance change with weather that W8JI warns about, you should not have any problem using the 150 Ohm line for a reversible beverage as long as you adjust the transf; /archives//html/Topband/2004-07/msg00071.html (8,487 bytes)
7. Re: Topband: two wires Beverage (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 27 Jul 2004 21:51:16 -0400; W8JI Ohm I might worry a little about loss when dry also. I'm not sure how this line behaves as a transmission line at radio frequencies. Maybe someone has measured some? I know rubber telephone par; /archives//html/Topband/2004-07/msg00072.html (8,612 bytes)
8. RE: Topband: two wires Beverage (score: 1): Author: "Ryszard Tymkiewicz" <rtym@ippt.gov.pl>; Date: Wed, 28 Jul 2004 08:08:16 +0200; First of all I would like to thank very much for all e-mails and advices. A few were trying such beverages and they were satisfied with them. Tom...wires I have got are with very thick jacket and I h; /archives//html/Topband/2004-07/msg00074.html (8,347 bytes)
9. Re: Topband: two wires Beverage (score: 1): Author: "Donald Chester" <k4kyv@hotmail.com>; Date: Wed, 28 Jul 2004 15:01:20 +0000; I might worry a little about loss when dry also. I'm not sure how this line behaves as a transmission line at radio frequencies. Before WW2 and the advent of coax cable, many hams used "twisted pair"; /archives//html/Topband/2004-07/msg00076.html (9,028 bytes)
10. Re: Topband: two wires Beverage (score: 1): Author: "Jacques RAMBAUD" <f6bki@wanadoo.fr>; Date: Wed, 28 Jul 2004 21:29:02 -0000; You are right Tom, I measured the losses of the 150 Ohms twisted military telephone line: I made two transformers 50 to 150 ohms tested them in serie , had about 0.4 dB losses from 1 to 30 MHz, then; /archives//html/Topband/2004-07/msg00078.html (10,487 bytes)
11. Re: Topband: two wires Beverage (score: 1): Author: dj2ya@t-online.de (Ulrich Weiss); Date: Wed, 28 Jul 2004 23:54:48 +0200; hi Rys, I have been using exactly that kind of twisted wire for most of my (unidirectional) contest beverages in the past, because of its excellent strength (and its low price)... as untwisting comes; /archives//html/Topband/2004-07/msg00079.html (12,728 bytes)
12. Re: Topband: two wires Beverage (score: 1): Author: "Ryszard Tymkiewicz" <rtym@ippt.gov.pl>; Date: Thu, 29 Jul 2004 07:53:35 +0200; Hmm...it seems Tom has been right /again/ and I wanted to have good solution in too easy way. Thanks Jacques and Ulli for measurements..the values of looses are so high that probably will " bury my i; /archives//html/Topband/2004-07/msg00083.html (8,218 bytes)
13. Re: Topband: two wires Beverage (score: 1): Author: dj2ya@t-online.de (Ulrich Weiss); Date: Thu, 29 Jul 2004 11:24:21 +0200; hello Jacques, we did the same tests at the same time with quite similar results... I did not use transformers but measured at half-wavelengths... your slightly better figures may be due to the fact; /archives//html/Topband/2004-07/msg00084.html (8,953 bytes)
14. Re: Topband: two wires Beverage (score: 1): Author: Roger D Johnson <n1rj@adelphia.net>; Date: Thu, 29 Jul 2004 15:38:07 -0400; Ryszard Tymkiewicz wrote: Hmm...it seems Tom has been right /again/ and I wanted to have good solution in too easy way. Thanks Jacques and Ulli for measurements..the values of looses are so high that; /archives//html/Topband/2004-07/msg00089.html (9,581 bytes)
15. RE: Topband: two wires Beverage (score: 1): Author: "Iowaguy" <earlham@radiks.net>; Date: Sun, 1 Aug 2004 20:33:09 -0500; Untwisting the military telephone wire can be a real chore, but it can be done with patience. I have untwisted lengths of 880' by chucking the wire into a cordless drill. It takes one person on each; /archives//html/Topband/2004-08/msg00000.html (11,807 bytes)

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