display in my
junkbox has special characters like square root, Hz, and muV and mV
on it! Yet again, mid-20th century technology beats out modern LCD panels!
(Sorry for the glee, but I hate LCD panels on everything.)
Tim.
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for
much larger scale jitter measurements).
Tim.
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be to contribute an
improvement (preferably with schematic) rather than a lengthy
textual or mathematical criticism.
Tim.
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[EMAIL PROTECTED] (Tim Shoppa) wrote:
Having seen some bad vibes unfold through the channels of the
letters column and other communications with editors, I think that
BY FAR the most useful thing to do would be to contribute an
improvement (preferably with schematic) rather than a lengthy
measurements
was comparing the wall clock to WWV. In other words, not very high-tech
by the measurement standards of many here!
Tim.
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, but not with DAC's and computers...)
Tim.
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if this is a defect of the educational
materials replicated throughout the decades or what. The ring
counter is not a one-trick-pony, instead it solves (AUTOMATICALLY)
all the glitches encountered with decoding states from binary counters.
Tim.
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for short periods
of time.
Tim.
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John Pettitt [EMAIL PROTECTED] wrote:
Tim Shoppa wrote:
My gut feeling: back up a little bit. Figure out how to do what you
want without a PCI bus, without gold fingers, without BGA's, etc.
I had several goals in mind when I asked the initial question:
1) a low cost high stability
the reference frequency would
be 1 MHz, right? So we need a divide-by-5 and a divide-by-27 and
a phase comparator.
Dead-bug construction would be perfect.
Tim.
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frequency standards?
Any potential evil (phase noise?) that may come about from using a
junkbox 7490 divider? Does most equipment care whether I do the divide-
by-five first and then the divide-by-two, or are they happy with the funky
waveform out of the divide-by-five?
Tim
Observatories. Have not yet had a chance to do much
detailed analysis on it.
Tim
Tim Natusch
Senior Lecturer
Electrotechnology Dept.
AUT
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hypothesis seemed
to stand out...)
Tim.
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, and some of them are regular enough that they
are similar in stability as an atomic clock (how many of us have
cesium beam tubes that will last for billions of years, hmmm?)
Tim.
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and Clock Collectors).
And as proof that there's a genetic component to our affliction,
my father is a long-time member of the NAWCC, and my baby pictures
are mixed in with pictures of hundreds of railroad watches :-).
Tim.
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favorite radio station, WWV!
I still remember my freshman physics textbook, with all the gedanken
experiments involving two observers, Nielsen and Arbitron...
Tim.
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out of phase when
I hear it. Is it possible that it's ticking to UT1, and not UTC?
Last time I scoped them the difference was about 0.45 seconds.
There's also a Chinese station on 5 MHz according to some charts
but I don't think I've ever heard it.
Tim
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