[time-nuts] Measuring coax temperature coefficient with a TICC

Yes, for a variety of reasons, I would not expect the best results with coax on a spool. The coax that I tested was a loose coil of coax pre-fabbed with BNC connectors. It should not have any significant stresses on it than a laid out 100 foot run would. The main purpose of the experiment

Re: [time-nuts] Measuring coax temperature coefficient with a TICC

Hi One of the easiest ways to get a slow ramp it to toss the foam box full of cable out the back door. Assuming it stays in the shade, you can often get a pretty good 24 hour temperature cycle. You still need to monitor things to know what the ramp is. Generally it’s slow enough that you can

[time-nuts] Measuring coax temperature coefficient with a TICC

Although I didn't have a way to log the temperature, I did have a couple of thermocouples on the coil of coax. The coil was rather tightly wound... maybe 7" OD, 3"ID, and 3" tall. One thermocouple was on the outside and one buried in the center of the coil. They stayed within a couple of

Re: [time-nuts] Measuring coax temperature coefficient with a TICC

kb...@n1k.org said: > I’d want to be pretty sure what the center conductor was made out of. I’ve > seen some stuff in coax that “one would think” should not be there (copper > over steel …). Does that effect the propagation time? If I gave you a good scope picture of a pulse after

Re: [time-nuts] Measuring coax temperature coefficient with a TICC

MMmm interesting but what about skindepth ?? surely the "R" is not DC R so would it matter? RF currents travelling in the copper anyway. I suspect that a steel inner might increase the L/unit length?, maybe this is more significant or not as is sceened by copper?? Alan G3NYK - Original

Re: [time-nuts] Measuring coax temperature coefficient with a TICC

Hi > On Apr 19, 2017, at 2:57 PM, Hal Murray wrote: > > > kb...@n1k.org said: >> I’d want to be pretty sure what the center conductor was made out of. I’ve >> seen some stuff in coax that “one would think” should not be there (copper >> over steel …). > > Does that

Re: [time-nuts] Measuring coax temperature coefficient with a TICC

A table of a bunch of rg6 catv permutations, http://www.texcan.com/media/import/pdf/Electronic_Cable_RG6_RG59.pdf At least on this list if it has a solid copper core, it also has a copper braid shield. I'm sure there is many more permutations out there. On Wed, Apr 19, 2017 at 7:00 PM Will

Re: [time-nuts] Measuring coax temperature coefficient with a TICC

On 4/19/17 11:57 AM, Hal Murray wrote: kb...@n1k.org said: I’d want to be pretty sure what the center conductor was made out of. I’ve seen some stuff in coax that “one would think” should not be there (copper over steel …). Does that effect the propagation time? If I gave you a

Re: [time-nuts] Measuring coax temperature coefficient with a TICC

TV co-ax these days for satellite or UHF is almost all steel wire with copper plating. In fact the 'F' connector that is used is designed to use that stiff wire as the center pin of the connector! Will On 04/20/2017 06:57 AM, Hal Murray wrote: > kb...@n1k.org said: >> I’d want to be pretty

[time-nuts] Measuring coax temperature coefficient with a TICC

Particularly if the cable / wire was made in say the last 10 years. I've seen a LOT of magnetic supposedly 100% pure (oxygen free, of course) copper wire lately. Much of it branded by companies with a reputation to lose. It has gotten so bad, I now check the resistance of all the wire I

Re: [time-nuts] Measuring coax temperature coefficient with a TICC

On 15 April 2017 at 02:34, Mark Sims wrote: > I finally got around to using a TICC to measure the temperature > coefficient of 100 feet of generic RG-58 coax using a TICC. The TICC was > clocked by a HP 5071A 10 MHz output. The 1PPS output was connected to the > input of

Re: [time-nuts] Measuring coax temperature coefficient with a TICC

On 4/19/17 3:34 AM, Bob kb8tq wrote: Hi On Apr 18, 2017, at 8:33 PM, jimlux wrote: On 4/18/17 3:55 PM, Bob kb8tq wrote: Hi On something like a 500’ spool of coax, the question will always be “what temperature is it where in the spool”. A single sensor will only give

Re: [time-nuts] Measuring coax temperature coefficient with a TICC

Hi > On Apr 18, 2017, at 8:33 PM, jimlux wrote: > > On 4/18/17 3:55 PM, Bob kb8tq wrote: >> Hi >> >> On something like a 500’ spool of coax, the question will always be “what >> temperature is it where in the spool”. A single sensor will >> only give you precise

Re: [time-nuts] Measuring coax temperature coefficient with a TICC

most likely the cooper is much ticker than the penetration of the lowest frequency for which the cable is used, therefore the high frequency "does not" see the steel inside of the cooper, that steel could cause problem if the coax also used to carry some power -- DC or AC -- because at lower