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

paul swed paulswedb at gmail.com
Fri Jan 20 14:41:32 EST 2012


The key as you have both mentioned is good coax.
LMR400 is not heliax but its actually pretty good.
Now if we were talking some company called RS.
I can assure him there would be trouble brewing.
Maybe not at first but my experiance is the plastisizer (Think thats what
they call it)
Leaches out of the foam and seriously degrades the shield in as little as 2
years.
Guess what stuff I have never ever purchased again.
Regards
Paul
WB8TSL

On Fri, Jan 20, 2012 at 2:27 PM, J. Forster <jfor at quikus.com> wrote:

> 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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