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

J. Forster jfor at quikus.com
Fri Jan 20 14:27:22 EST 2012


I thought of that, but I know where Jim lives and copper pipes stiking
through a wall would gather condensation and ice on the inside because
it'd conduct the sub-freezing temps inside and maske a real mess. The
situation would be reversed in summer.

He could use PVC pipe wrapped with a layer of adhesive copper foil with
the seams soldered.

-John

============


> In the past when I had that problem I used copper pipes as feed through
> the
>  wall and bend the pipes with a pipe bender one on each side. Never had a
> problem, do not know if I would have other wise.
> Bert Kehren
>
>
> In a message dated 1/20/2012 1:46:32 P.M. Eastern Standard Time,
> mspencer12345 at yahoo.ca writes:
>
> I've run  my GPS antenna lead along with coax carrying 100 Watts on HF and
> 50 watts on  VHF / UHF with no known issues.
>
> I do have ferrite chokes on all my feed  lines.
>
> I also use the Symmetrciom 53532 antenna.
>
> --- On Fri,  1/20/12, James Robbins <jsrobbins at earthlink.net> wrote:
>
>>  From: James Robbins <jsrobbins at earthlink.net>
>> Subject:  [time-nuts] T'bolt antenna lead-in running near HF RF
> transmitting  coax
>> To: time-nuts at febo.com
>> Received: Friday, January 20,  2012, 1:41 PM
>> 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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