most likely the cooper is much ticker than the penetration of the lowest
frequency for which the cable is used, therefore the high frequency
"does not" see the steel inside of the cooper, that steel could cause
problem if the coax also used to carry some power -- DC or AC -- because
at lower frequency or DC the cable's current carried mostly in the
cooper, and while the cooper constitute just a small fraction of the
center wire cross section, a cable with "steel core" could carry much
less current, than a cable with full cooper. But the steel core cable
has one advantage it is usually stronger than a full cooper cable and
therefore it is usable for outside installation with larger support
distance.
73
KJ6UHN, [a former engineer of a cable manufacturer ]
Alex
On 4/19/2017 11:57 AM, Hal Murray wrote:
[email protected] said:
I’d want to be pretty sure what the center conductor was made out of. I’ve
seen some stuff in coax that “one would think� should not be there (copper
over steel …).
Does that effect the propagation time?
If I gave you a good scope picture of a pulse after going through chunk of
coax, could you figure out the ratio of copper to steel? Would you need to
know the length or could you figure that out too?
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