Hi Jim, granted the loss is lower at HF but additional loss is still
additional loss that could be avoided. I would not suggest replacing an
existing
run of 8214 used on 80 meters. The time for that decision is when the
cable is purchased if one wants to get full value from the product.
I saw that Belden 8267 (RG213) has a non contaminating PVC jacket and that
would represent good value especially for the lower bands where the loss is
already low.
I personally would choose Davis RF Buryflex over any of the Belden cables.
The quality and low loss has been proven and without the need to fund an
international marketing organization, the cost is substantially lower. I do
sell some Belden cable for those who insist on the brand.
73,
Gerald K5GW
In a message dated 6/11/2015 7:18:41 P.M. Central Daylight Time,
jim@audiosystemsgroup.com writes:
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@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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