Actually, Polyphaser recommended against putting loops in the coax line. The
thought was that a loop would greatly increase the field and act as an
antenna that would increase the chances of induced current into other
conductors.
It is also recommended not to parallel any lines from one side of the
protector/ground point with lines on the other side such as lines going into
the house from the protection/ground panel.
73
Gary K4FMX
> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of Wes Attaway (N5WA)
> Sent: Thursday, May 27, 2010 9:58 AM
> To: n4zr@contesting.com; TowerTalk@contesting.com
> Subject: Re: [TowerTalk] Lightning suppression through coax loops
>
> I believe I remember that the old Polyphaser manual had some info about
> coax
> loops and bends. The idea is simple, and makes sense, because the
> grounding
> at the tower and at the entrance to your house, etc., is creating a
> voltage/current divider that will, ideally, shunt most of the energy to
> ground before it gets to your house.
>
> The Polyphaser manual explained that loops and bends in coax runs toward
> the
> point of entrance add inductance to that path and cause it to be
> incrementally less attractive for the lightning energy.
>
> I see no reason to doubt this because it is simply a practical application
> of Ohm's Law.
>
>
> ------------------ Wes Attaway (N5WA) ------------------
> 1138 Waters Edge Circle - Shreveport, LA 71106
> 318-797-4972 (office) - 318-393-3289 (cell)
> Computer Consulting and Forensics
> -------------- EnCase Certified Examiner ---------------
>
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Pete Smith
> Sent: Thursday, May 27, 2010 7:10 AM
> To: TowerTalk@contesting.com
> Subject: [TowerTalk] Lightning suppression through coax loops
>
>
>
> 73, Pete N4ZR
>
> The World Contest Station Database, updated daily at
> www.conteststations.com
> The Reverse Beacon Network at http://reversebeacon.net, blog at
> reversebeacon.blogspot.com
> I bought an Ameritron RCS-10 antenna switch at Dayton, and in reading
> the manual (please, no giggling) I note that it calls for a two-turn
> loop in each antenna coax line just before entering the relay box.
> These are described as "drip and lightning retarding loops." The manual
> is quite prescriptive (for example, "keep coils spaced from each other
> by vertical or horizontal separation of 2" minimum"), and I get the
> "drip" part, but I wonder what the real, practical effect of these loops
> would be. Is there enough inductance to offer any practical blocking
> effect for induced voltages resulting from a nearby strike?
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