[TowerTalk] Rotor loop coax choices ?

[Jim Brown]

Right. I'm looking at the thick Belden catalog.  9251 is the only one 
that is listed as non-contaminating.

That said, how much of a problem is that at HF? I wouldn't think much. 
At UHF, yes.

73, Jim K9YC

On Thu,6/11/2015 1:54 PM, TexasRF--- via TowerTalk wrote:
> Hi Jim, it is not widely known but Belden 8214 does not have a
> non-contaminating jacket.  I just confirmed it on the 8214 data sheet on  their website
> to make sure I remembered it correctly.
>   
> Too bad as it is a very nice coax otherwise.
>   
> 73,
> Gerald K5GW
>   
>   
>   
> In a message dated 6/11/2015 3:37:18 P.M. Central Daylight Time,
> jim at audiosystemsgroup.com writes:
>
> On  Thu,6/11/2015 1:16 PM, Mark Spencer wrote:
>> I have nagging doubts about  using cables with a solid foil shield for a
> rotor loop.
>
> I would share  your concern.
>
>> I do like the idea of double shielded cables so  RG213, RG 8 etc are off
> the table for now.
>
> I wouldn't worry about  "double-shielding," but rather the quality of the
> shield. Look through the  Belden catalog for an RG8 or RG213 with a
> robust copper braid shield and  stranded center. Look at 8237, 8268,
> 8214. or 9251. All are 97% shield  coverage. Check out vendors like
> Markertek. 9251 has non-contaminating  jacket.  8214 is #11 center; the
> others are #13.
>
> You don't  need a lot of coax for the rotor loop, so cost is hardly a
> factor -- I'd  be more concerned about finding someone to sell you short
> lengths.  :)
>
> 73, Jim  K9YC
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