I did some careful measurements of CAT5 cable a few years ago using a 4 port network analyzer (NOT a 2 port VNA with baluns). On my random sample, the characteristic impedance was within 5% of 100 ohms. The cable is fairly lossy, which is no surprise given the tiny wires. There doesn't seem to be any compelling reason to use it in place of RG-6.
Rick N6RK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
