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To: <towertalk@contesting.com>
Date: Tue, 23 Dec 1997 17:02:36 -0500 (EST)
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To: K7LXC <K7LXC@AOL.com>
From: Mark Sihlanick <n2qt@pipeline.com>
Subject: Re: [TowerTalk] Stranded vs solid wire
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I think the main basis of these claims are based on high power multicarrier
operation, like you would have with several cellular transmitters feeding a
single antenna through a combiner. At these levels, connectors and cable
can create intermod. For normal amateur use, especially at hf, where only
one high level signal is on a cable this effect should be negilible.
Receive wise the levels seen just wont be high enough to cause much effect.
At 04:25 PM 12/23/97 EST, you wrote:
>In a message dated 97-12-23 16:12:37 EST, n6ig@netcom.com writes:
>
>> Andrew, the maker of Heliax and Superflex transmission lines, has a
>> series of "technical documents" that claim to demonstrate the
>> superiority of solid center conductor transmission line versus
>> stranded. This also "demonstrates" the superiority of solid shields
>> versus braided shields. Their dissertations are based on the "facts"
>> that stranded and/or braided cables have many, many more wire-to-wire
>> junctions in which intermodulation could be created IF such a junction
>> were to corrode. If you used a solid shield or center conductor, such
>> junctions would be eliminated. They have all sorts of laboratory data to
>> emphasize that.
>
>Hi, Jim --
>
> Interesting. Could you pass along the info to obtain these app notes?
>
> I would tend to give a fair amount of credence to the Andrew data.
First,
>they have the lab equipment to REALLY test this stuff. Second, they operate
at
>frequencies where these effects (and probably others) can become significant.
>These frequencies are from 9 gHz. up to 13 gH.!
>
> I think that this data comes from engineering and not marketing.
>
>73, Steve K7LXC
>
>--
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