Dave, the typical spec sheet for VNA cables have a very restricted "lab temperature" range specified. For example 23C +/- 5C.
There's a very nice graph showing effect of flexure on phase stability in Fig 2 of this spec sheet: https://www.gore.com/sites/g/files/ypyipe116/files/2016-07/GMCA-0224-DAT-US-MAY16_e.pdf Funny how people always want to put the words "dielectric" and "constant" right next to each other but we know it isn't constant :-) Tim N3QE On Mon, Jan 23, 2017 at 8:26 AM, Dr. David Kirkby (Kirkby Microwave Ltd) < [email protected]> wrote: > On 13 January 2017 at 06:52, Ole Petter Ronningen <[email protected]> > wrote: > > > Hi, all > > > > The question of phase shifts in cables pops up every now and then on this > > list - I stumbled across a good table of measured phase shifts with > > temperature in different cable types in this paper: > > http://www.ira.inaf.it/eratec/gothenburg/presentations/ERATEC_2014_ > > PresentationWSchaefer.pdf > > that I though would be of interest to others. > > > > > I've like to know how VNA cables compare. They are expensive enough - a > couple of cables around 600 mm long (24") for my VNA are over $5000. They > are much larger diameter than normal cables, but much more flexible too. > The construction is obviously very different. Since mine are designed for > use to 26.5 GHz, the internal diameter of the outer conductor can be no > more than a couple of mm, yet the overall cable has a diameter of about 15 > mm. > > Dave > _______________________________________________ > 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.
