[R-390] cables

[Bob kb8tq]

Hi

Putting a couple turn “coil” in power cords or coax is a cheap
and simple way to make a common mode choke. The inductance
may not be large. It does not have to be super big. You want to 
knock down the current to something manageable. You don’t have
to eliminate it entirely. (Yes, Motorola paid for the collage course 
I learned that in ….).

Bob

> On Sep 21, 2017, at 9:25 PM, Glenn Little WB4UIV <glennmaillist at bellsouth.net> wrote:
> 
> Believe it or not, pun intended, Motorola would put knots in their power cords at communications sites.
> This was to provide an impedance to impulse (lightning).
> Not sure if it really worked, but, it was done at a lot of their sites.
> 
> 73
> Glenn
> WB4UIV
> 
> On 9/21/2017 10:36 AM, wb3fau55 at neo.rr.com wrote:
>> On the subject of "electricity flowing out",  if you put a knot in your power cord,  you will stop the flow of  electricity,  sort of like resistance or impedance.  wb3fau.
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> -- 
> -----------------------------------------------------------------------
> Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
> Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
> QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
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> of the Amateur that holds the license"
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