Think of light dispersing through a prism creating a spectrum. The amount of
bending (which is equivalent to the amount of slowing down of the light) is
very frequency
dependent there.
----- Original Message -----
From: "Hal Murray" <[email protected]>
To: <[email protected]>
Sent: Saturday, September 12, 2009 5:33 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?
Context is a memory from 20 years ago. I think it was a data sheet or app
note for clock recovery on a T1 line. Maybe it was just explaining the
specs
for a line amplifier. The idea was that the recovered clock would shift
depending on the frequency of the signal. The frequency depended on the
data
pattern so you could harass the clock recovery by picking nasty data
patterns.
I think I almost understood it back then when I had the info in front of
me.
I've tried to remember or reconstruct it a couple of times over the years,
but I've never been successful.
--
These are my opinions, not necessarily my employer's. I hate spam.
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