Re: [time-nuts] Are cable delays frequency dependent?

2009-09-12 Thread Mike S
At 05:50 PM 9/12/2009, Bruce Griffiths wrote... Magnus Danielson wrote: > Bruce Griffiths wrote: >> Bruce Griffiths wrote: >>> Bruce Griffiths wrote: >>> Hal Murray wrote: We all get every message posted to the list. 5 levels of quoting is unnecessary.

Re: [time-nuts] Are cable delays frequency dependent?

2009-09-12 Thread Bruce Griffiths
Magnus Danielson wrote: > Bruce Griffiths wrote: >> Bruce Griffiths wrote: >>> Bruce Griffiths wrote: >>> Hal Murray wrote: > If so, what's the mechanism? > > I know that attenuation is frequency dependent due to skin effect > but I can't turn that into variable de

Re: [time-nuts] Are cable delays frequency dependent?

2009-09-12 Thread Magnus Danielson
Bruce Griffiths wrote: Bruce Griffiths wrote: Bruce Griffiths wrote: Hal Murray wrote: If so, what's the mechanism? I know that attenuation is frequency dependent due to skin effect but I can't turn that into variable delays. Is there a magic term I should google for and/or does

Re: [time-nuts] Are cable delays frequency dependent?

2009-09-12 Thread Bruce Griffiths
Bruce Griffiths wrote: > Bruce Griffiths wrote: > >> Hal Murray wrote: >> >> >>> If so, what's the mechanism? >>> >>> I know that attenuation is frequency dependent due to skin effect but I >>> can't >>> turn that into variable delays. Is there a magic term I should google for >>> an

Re: [time-nuts] Are cable delays frequency dependent?

2009-09-12 Thread Bruce Griffiths
Bruce Griffiths wrote: > Hal Murray wrote: > >> If so, what's the mechanism? >> >> I know that attenuation is frequency dependent due to skin effect but I >> can't >> turn that into variable delays. Is there a magic term I should google for >> and/or does anybody have a good URL? >> >> Conte

Re: [time-nuts] Are cable delays frequency dependent?

2009-09-12 Thread Bruce Griffiths
Hal Murray wrote: > If so, what's the mechanism? > > I know that attenuation is frequency dependent due to skin effect but I can't > turn that into variable delays. Is there a magic term I should google for > and/or does anybody have a good URL? > > Context is a memory from 20 years ago. I thin

Re: [time-nuts] Are cable delays frequency dependent?

2009-09-12 Thread Poul-Henning Kamp
In message <20090912163352.8a958b...@ip-64-139-1-69.sjc.megapath.net>, Hal Murr ay writes: >If so, what's the mechanism? There are several mechanisms. For microwave cables, I think the short and precise explanation is that materials act weird once you get into the details. >Context is a memory

Re: [time-nuts] Are cable delays frequency dependent?

2009-09-12 Thread Ian Sheffield
PM Subject: [time-nuts] Are cable delays frequency dependent? If so, what's the mechanism? I know that attenuation is frequency dependent due to skin effect but I can't turn that into variable delays. Is there a magic term I should google for and/or does anybody have a good URL? Cont

Re: [time-nuts] Are cable delays frequency dependent?

2009-09-12 Thread Bob Camp
Hi A lot depends on the structure of the cable it's self. For plastic dielectric cables the answer is normally "yes the delay is frequency dependent". One mechanism is simply that the velocity of propagation it's self is frequency dependent in the material used. Some of the mechanism's a

[time-nuts] Are cable delays frequency dependent?

2009-09-12 Thread Hal Murray
If so, what's the mechanism? I know that attenuation is frequency dependent due to skin effect but I can't turn that into variable delays. Is there a magic term I should google for and/or does anybody have a good URL? Context is a memory from 20 years ago. I think it was a data sheet or app