Bill,
According to "Reference Data for Radio Engineers",
RB-88 "is" a pulse type coaxial cable (as N5EM said). Under remarks, it is
listed as "Medium-size multishileded high-voltage cable. Z=48ohms"
The table lists four braids, a 19/.0117" tineed copper center conductor, a
dielectric nominal diameter of 0.288, a nominal overall diameter of 0.515,
a capacitance of 50 pF/ft, and a maximum operating voltage rating of 10,000
volts!
However the bad news is that the dielectric is shown as consisting of "Layer of conducting rubber plus two layers of synthetic rubber".
I suspect that the dielectric porperties of the cable are about the same as the
tires on your car! It doesn't sound like a great cable for VHF.
It would be interesting to try to measure the loss, though. You can do it
pretty easily with a small transmitter and a good rf power meter or by measuringthe SWR with the far end open-circuited.
Good luck and 72/73,
Joe E., N2CX
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