>
>
> Yes, but why would anyone rely on soldered connections (as for the coax
> shield to braided ground cable)?
Under the proper conditions I would.
> Solder would definitely have the
> highest resistance per unit volume in the whole chain, and it melts when
> it gets hot. I would think such a connection would be more like a fuse
> that blows before the surge has progressed very far.
>
It maybe the weakest link and it may not, but that does not necessiarily
make it a problem, particularly in this case.
The area of contact is quite large giving it more than the current carrying
capability of the shield on one cable. So even if the material (solder) is
of a higher resistance than the braid, if the area is large enough (and it
appears to be) then the resistance of the connection is going to be equal to
or even less than the braid. A large contact area with copper on each side
makes for one whale of a good heat sink. It also comes off at a very
shallow angle which is recommended. There are also a whole slew of these
connections in parallel reducing the resistance even farther.
Given the large cross sectional area of the solder connections compared to
the cross sectional area of the coax (which is quite small), I'd bet they
wouldn't fail any sooner than the braid itself from a lighting strike.
Also as this is a safety issue (911 call center in the heart of lightning
alley) this installation would have had to meet code, so I'd bet it's well
done.
Roger (K8RI)
> 73,
> Dave AB7E
>
>
> jacobsen_5@msn.com wrote:
>> Martin wrote:
>> "More copper (and more surface area) for lightning protection are always
>> better, like 4/0. I ran across an interesting commercial installation
>> here: http://tinyurl.com/2v5sea<http://tinyurl.com/2v5sea> .
>>
>> 73 Martin AA6E"
>>
>> Now THAT was interesting reading!!!!!!!!!!!!!!!!!
>>
>> 73
>> K9WN Jake
>> _______________________________________________
>>
>>
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