Gaius wrote in
:

Lostgallifreyan wrote:

Conversely, I found some nice coax in a skip once that had two heavy
braids amounting to almost complete coverage around a single fine
stranded core. (Found outside a telephone exchange, but I don't know
what frequency they were intended for, though I used some for an
outdoor VHF receiving quarter wave dipole with good results, and I
suspect it will do for a SW longwire once I get a matching transformer
for it).

If it was a UK (BT) telephone exchange, then it probably was "Cable
coaxial 2003".
Used for critical video and general HF use. I don't know what it's
officially spec'd to, but it would work well up to several hundred MHz.
Characteristic impedance of 75ohms, and easily capable of 100W into a
decent match.



Sounds like the same stuff, though I have 2002 on mine (which in absence of
other markings was cryptic enough that I was unsure of it, though I think it
might have been earlier than 2002 when I found it. I thought it might be
75 ohm but I had no idea it might efficiently carry high power. But I knew it
was well over-spec'd for the uses I put it to. I was lucky to find it. The
staff there were happy enough for me to raid the skip, too... Should try it
again sometime. That stuff seems to last forever even outside in strong daily
temperature changes and direct sunlight.