[PCR-1000] ZAPTRAP

[Ian Stewart]

A coil is a good idea, the problem is that the voltages being protected from
are changing extremely rapidly, in the order of nanoseconds to microseconds,
so the coil inductance would have to be extremely small. This would best be
realised by a copper strap. Not useful at all. If the inductance was too
high, it would exacerbate the condition trying to be protetcted against,
rather than protect.

Ian Stewart
ZL2TMQ


----- Original Message -----
From: "Tim Tapio" <tim@timtapio.com>
To: <pcr-1000@mailman.qth.net>
Sent: Monday, August 18, 2003 2:31 AM
Subject: RE: [PCR-1000] ZAPTRAP


> Hey folks,
>
> Happened to open an antenna book the other night....we're kinda goofy
> thinking of diodes, etc.  Better way is to use a coil.  It would represent
a
> high impedance to the rf signal yet be a direct ground for DC.  You'd have
> to figure out the reactance of the coil for the frequencies you're looking
> at to make sure if was a high enough impedance to block your rf...or you
> could do the scientific method of "try it and see".  Not sure if Radio
Shack
> still has any coils or not....they're pickings have been slimmer and
slimmer
> over the years....
>
> 73 de Tim
>