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...ct&R=520306 8

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