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

[Gedas]

oh, one very important item I forgot to add......the termination at both 
ends of your jumpers will be ABSOLUTELY critical as to how well your 
overall shielding effectiveness will be. You have to make sure that the 
connectors you use are of good quality and are properly terminated. The 
best quality shielded cables will be rendered near useless when it comes 
to SE if the shields are not properly bonded to the outer shell of the 
connectors at both ends.

Gedas, W8BYA

Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

On 9/4/2019 3:31 PM, Gedas wrote:
> 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
> Light travels faster than sound....
> This is why some people appear bright until you hear them speak.
>
> 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
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk at contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>