Gaius wrote in
:

Lostgallifreyan wrote:

Thanks. That matches closely except the dielectric, which I think is
foam (is certainly foamy or foamish). Colour is same too, though closer
to white than yellow. As far as I know the impedance is purely based on
the scale and geometry of the cross-section, and if so, I guess the
central conductor of 2003 is also thicker. I think there were seven
strands of very thin copper. If you or anyone reading this really wants
to know I'll get a vernier gauge and find a bare cable end somewhere...
External diameter is approx 5mm on the 2002 type.

Do you know if it's only BT internal use? If I can buy it economically,
I'd consider it. I like working with it, when I'm in the mood for
picking apart cable braids.


You're right - my memory must be porous. 2002 has a FOAM dielectric.
Also, 2003 has a single strand inner conductor (spec must have changed -
used to be stranded). You can buy 2002 from RS - it's a BT spec, but
available for anyone. Have a look at :

http://uk.rs-online.com/web/search/s...method=getProd
uct&R=5203068

It's only £58 for 100m, and the loss is reasonable at 3.61dB/100m @
4MHz. (2003 cable is 2.33dB/100m @ 4MHz)


Nice. Given what RS are charging for RG59 with a double braid that appears
similar, it looks very good. I don't know enough to choose between them
though, especially given the huge variety of cables RS show for RG59 with
costs varying more than tenfold per metre. From what I've seen of it I'd go
for that BT cable at their price. (They add VAT though..) I guess BT's
economies of large scale help this stuff to be cheaper than it otherwise
would be.