JT> The following is from the back of an old DSE cattledog, though only
JT> part of  the list.  I've picked the two more common cable types.  Ask
JT> if there are other  cables types you're interested in, there are about
JT> 15 different types listed,  some 50 ohm, some 75 ohm, some 93 ohm.

JT> Attenuation in dB/100metres
JT> Type                50MHz  100MHz  200MHz  400MHz     Velocity factor
JT> RG-58C/U  50ohm     10.8   16.1    23.9    37.7       66%
JT> RG-213/U  50ohm      5.2   7.2     10.5    15.4       66%

 Losses are roughly half the 50 MHz figure at 10MHz, where they
level off to simply resistance losses.


Regards,
Bob


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