[TowerTalk] Preferred type of coax to be used for jumpers in a multi-operator room ?

[Gedas]

It will depend on who makes the cables you are comparing. If both are 
M17 rated then both should be double shielded and use silver coated 
copper conductors which is good but some manufactures may use 95% braid 
coverage while some may use less. Some may use 95% for both shields 
others may use 95% for the outer and less for the inner. Also the angle 
of the weave also affects the shielding effectiveness. This SE will also 
vary with frequency. But in general, esp for HF use, you will find both 
to have similar shielding performance as long as you stick to a known 
trusted & respected name brand. Also keep in mind the dielectrics are 
totally different between the two.

Gedas, W8BYA

Gallery at http://w8bya.com
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On 9/4/2019 2:54 PM, Stig Lindblom wrote:
> Gents;
>
> We are rebuilding a contest station operating room (HS0ZAR at HS0ZGD) and
> need to do a lot
> of new jumpers.
>
> Ref. advise below from K9YC (tnx) we will use RG400 (or similar) for
> short jumpers.
>
> Considering to use RG214 (double shield) for longer jumpers, and for
> coax-stubs as well.
>
> How is the measured, or experienced, shielding of RG214 compared to the
> RG400 ?
>
> 73 de Stig
>
> LA7JO _ HS0ZGD
>
> On 8/6/2019 6:50 AM, Gedas wrote:
>
> And. the conductors are Silver plated, copper clad steel.
>
> ------------------
>
> Clarification for other readers. The center of RG142 is silver coated
> copper coated steel, the center of RG400 is stranded silver-coated
> copper. Both have double silver-coated copper braid shields.
>
> Loss is about the same as RG58 -- in other words, fairly high. The
> principal virtue of these cables is their superior SHIELDING, which is a
> LOT better than most braided coax.  You only want to use this stuff for
> short jumpers.
>
> I've been happy with at least two purchases of Harbour Industries RG400
> that I've found on ebay from a US vendor.  Harbour Industries is based
> in VT, and has a presence across the border in QC. NA6O was happy with
> the RG400 he bought from China.
>
> 73, Jim K9YC
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