[R-390] Remaking mini-BNC cable assembly

[Osamu Hazawa]

Hello to the list,

I'm going to remake so-called mini-BNC interconnect cable assemblies as they
are hardened and cracked.
As I could not find the impedance of the cable in The 21st Century
R-390A/URR
Reference (Y2K-R2) so far and the manual calls for RG-187 at "Table 5-4 -
Test
Cable Data", I assume the line impedance is 75 ohm.

Is it correct and is RG-187 the best alternative for the stock cable?

Osamu Hazawa