For precision timing measurements, I would think that there would be concern about the double reflections of a badly mismatched low loss transmission line (such as using 75 ohm line in a 50 ohm environment). The re-reflected signal will act similar to multipath (as a delayed aggressor) on all satellite signals equally. The impedance mismatch delayed reflection aggressor could aggravate timing errors due to changes in temperature or stress in the cable. Whether this is important for you depends on how time-nutty you want to get.
See these papers: Effects of Antenna Cables on GPS Timing Receivers: http://tf.boulder.nist.gov/general/pdf/1384.pdf Absolute Calibration of a Geodetic Time Transfer System: http://xenon.colorado.edu/paperIrevise2.pdf -- Bill Byrom N5BB _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
