"Cecil Moore" wrote in message
...
Richard Harrison wrote:
In the usual h-f transmission line, Zo appears as an Ro.

RG-174 has about 6dB loss per 100ft on 12m. Its Z0 is equal
to Sqrt[(R+jXL)/(G+jXC)].

Does (R+jXL)/(G+jXC) really equal 2500 for RG-174 on 12m? The specs
say the Z0 of RG-174 is a nominal 50 ohms.

of course its not exactly 2500, otherwise there would be no loss. but its
close, maybe 2500+j10 or something like that. and even the resistive part
may not be exact, the nominal 50 ohms could be 45 to 55 depending on the
tolerances of the manufacturer.