[time-nuts] T'bolt antenna lead-in running near HF RF transmitting coax

J. Forster jfor at quikus.com
Fri Jan 20 14:03:48 EST 2012


A few of the correct ferrite Common Mode Chokes on the lines would not
hurt. Also, use good quality coax, preferably with both a copper braid and
conductive foil to get near 100% shielding efficiency. Hardline is
probably better.

I'll ask about the best Common Mode Choke location. My hunch would be on
the outside, w/in a foot of the wall.



> Can I run the coax feed-in from a Symmetricom 58532A GPS antenna
> (feeding my T'Bolt) adjacent to coax which is carrying HF RF of 500
> watts?  I have a 1.5"  hole through an outside wall in my house
> through which my HF ham antenna coax passes (LMR400 coax).  Can I
> safely run the GPS antenna coax through the same hole which would put
> the coax parallel with and touching the other coax for about 8
> inches.  If not, how much separation would be advisable?  Many
> thanks.  Jim Robbins N1JR
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