[Lowfer] WC2XSR/13 Web Page Update for 7/28

[Ralph Hartwell]

> This gets me thinking about how a TX loop responds to lightening. (Get
ready
> for another advertisement for loop antennas) Looks like a loop does
not have
> the 'continuing arc' problem because the RF across the lighting
arrestor is
> ~10 times less for the same power as a vertical. I can also see that
the

Correct!  Suppression of lightning induced voltages generated across the
loop should be easy.  It's the problem of suppressing the loop-to-ground
nasties that's harder.  If the loop had a "ground" point it would be
easy to simply earth ground the loop conductor at that point.  Then you
should be safe from just about everything but a direct strike.

> most lightening proof coupling to a loop is the transformer, rather
than the
> capacitor 'L' network. However, because the ferrite core is somewhat
> conductive, the spacing between core and secondary winding had better
be
> greater than the spark gap distance.

I'd think about a well-grounded capacity shield between windings as well
as using high voltage insulation on the coil windings.  In any event,
except for a very close lightning hit, the loop should be about 100
times easier to tame than my vertical lightning rod.  A direct hit, of
course, would nail stuff pretty well, no matter what type antenna is
used.

73,

Ralph   W5JGV / WC2XSR / 13

http://home.att.net/~shmrg

http://home.att.net/~ralph.hartwell