[Elecraft] Coax and the walking VFO

Tue Nov 26 14:07:00 2002

There is a problem with using any foam-core coax in an applications
where it is bent, curved or stressed.That is "creep"of the center
conductor through the relatively soft foam dielectric toward the
shield. This not only causes a minor impedance bump but also can
greatly reduce the voltage rating of the coax at the bend. Solid
dielectric coax is usually preferred in any application where there
will be movement or mechanical stress that results in curvature of the
coax.

73/72, George
Amateur Radio W5YR -  the Yellow Rose of Texas
In the 57th year and it just keeps getting better!
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
K2 #489      Icom IC-765 #2349     Icom IC-756 PRO  #2121

----- Original Message -----
From: "Doug Faunt N6TQS +1-510-655-8604" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>; <[email protected]>
Sent: Monday, November 25, 2002 10:14 PM
Subject: Re: [Elecraft] Coax and the walking VFO

>    From: "David A. Belsley" <[email protected]>
>    Content-Disposition: inline
>    Date: Mon, 25 Nov 2002 23:02:51 -0500
>
>    Bruce:
>      Get yourself some 9913F7.  It's about the same size as RG-8U
but a lot
>    more flexible. And it is very, very low loss and will easily
handle 500w.
>    The 'F' in the name indicates 'flexible' and the 7 is the number
of
>    strands.  Be careful not to confuse it with 9913, which is solid
wire and
>    quite stiff.
>
> For what it's worth, the guys at RF Connection said that they're out
> of stock on that, and Belden isn't producing it currently.
> I just ordered some CXP1318FX from Cable Experts.  I'm hoping it
will
> turn out to be flexible and rugged, since it's got a high number of
> small strands for the center conductor, and a foam core instead of
> air.
>
> 73, doug
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