I've seen data re delay vs temperature for high end 50 ohm cables. I've never seen it for 75 ohm CATV style cable.
Back when I was into time nuts pursuits this was one of the main reasons I was contemplating switching my GPS antenna feed line to hardline. I never made the change but still have the hardline. To this day I still use Teflon RG58 style cable (purchased surplus from Boeing decades ago) for my GPS antenna fee line to the splitter. I doubt I will ever change it out. Sent from my iPhone > On Dec 6, 2015, at 4:21 AM, Attila Kinali <[email protected]> wrote: > > On Sat, 5 Dec 2015 17:06:03 -0800 > Mark Spencer <[email protected]> wrote: > >> Over the years I've used a number of CATV style 75 ohm patch cords >> with F connectors, F female to female couplers and F to other connector >> adaptors to distribute gps signals from my GPS splitter to various >> receivers. I've never been able to notice any difference in reported >> signal strength vs using "brand name" 50 ohm coax with N connectors. > > Well, putting the numbers into a calculator gives: > VSWR: 1.5 > Load Return loss: -14dB > Load Mismatch Attenuation: -0.2dB > > I'd say that for a receiver, this is quite negligible. Heck, even 1dB > loss wouldn't hurt too much. I would suggest, that for all practical > purposes, the use of (good) satellite coax cable would be more than > good enough for most of us. The only thing i'm not sure about is how > the delay through the cable behaves over time (aging, temperature, humidity). > If anyone has some data on that, for different types of cables, I > would appreciate getting a copy :-) > > Attila Kinali > > -- > It is upon moral qualities that a society is ultimately founded. All > the prosperity and technological sophistication in the world is of no > use without that foundation. > -- Miss Matheson, The Diamond Age, Neil Stephenson > _______________________________________________ > 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. > _______________________________________________ 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.
