At one point I contemplated running Andrews "Heliax" for my GPS antenna. Part of the rationale was due to the data presented in page 2 of the following paper.
http://ivs.nict.go.jp/mirror/meetings/v2c_wm1/phase_stability.pdf I subsequently decided to stay with my existing run of plenum rated RG58. The bulk of my cable run is indoors where the temperature is fairly stable. Regards Mark Spencer > On Nov 21, 2016, at 12:59 PM, Scott Stobbe <scott.j.sto...@gmail.com> wrote: > > When I first took a look at some of the coax datasheets I couldn't find > anything. I was able to find the following paper "phase stability of > typical navy radio frequency coaxial cables" > http://www.dtic.mil/dtic/tr/fulltext/u2/628682.pdf I attached the table > from the last page. They estimate RG59 to have a tempCo of -330 PPM/degC > for electrical length. They also estimated RG-58 at -480 PPM/degC. > >> On Mon, Nov 21, 2016 at 2:44 PM, John Ackermann N8UR <j...@febo.com> wrote: >> >> I can't find the data right now, but will keep digging. There's also a >> short paper from the early 2000s from Haystack on their measurement of >> LMR400 in an environmental chamber. They came to the same conclusion, but >> I can't find that paper either. :- > > > John, many thanks for the Haystack tip! That is a wonderful paper, I > believe the one you are quoting is "Dispersion and temperature effects in > coax cables" http://www.haystack.mit.edu/tech/vlbi/mark5/mark5_memos/067.pdf > <PhaseTempCo_Coax.png> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.