On May 14, 2012, at 09:33 , b...@lysator.liu.se wrote:
More modern 3-5.5V into 50ohm, 20us.
http://contracting.tacom.army.mil/majorsys/jab/DAGR%20Interface%20Specification.pdf
Is a similar standard available for the older PLGR devices?
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http
otherwise be annoying at a light with a short green cycle. :-)
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of time-nuttiness coming on. :) Even in its
current configuration, it far exceeds my needs for a frequency reference.
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On Feb 12, 2011, at 11:03 PM, Kevin Rosenberg wrote:
Exceeding your needs? Doesn't seen like that surge of time-nuttiness has hit
yet ;)
Don't worry, I'm just pacing myself. :)
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.
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and follow
searching exactly where the satellites
aren't!
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feeding multiple receivers
through a splitter, we sometimes had to insert attenuators in each receiver's
antenna feed to keep them from jamming each other.
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. It'll depend on
the particular combination of receivers, the LO frequencies, how much LO leaks
out of each one, whether that LO leakage lands in a bad spot for any of the
other receivers, how much isolation is between the receivers, etc.
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On Nov 30, 2010, at 8:42 AM, William H. Fite wrote:
I expect you can do the same thing with an electric fan.
Or by chewing something crunchy (like ice) while watching a raster-scanned
(CRT) television.
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and back. It
won't hurt to locate the sensor behind a berm, either. The sky screen and/or
its supports will still get shot eventually, but that will be a lot cheaper to
replace than the sensor.
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this would provide enough information to estimate fun details like ballistic
coefficient.
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with suitable accuracy and precision. Does anybody know
how many bits of precision are used on tombstones these days?
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On Oct 24, 2010, at 1:58 PM, Poul-Henning Kamp wrote:
In message 53601812-fc62-4098-9266-55edf50af...@nf6x.net, Mark J. Blair
wri
tes:
Does anybody know how many bits of precision are used
on tombstones these days?
Most tombstones are engraved with CNC machines and while I have yet
On Oct 24, 2010, at 2:03 PM, Magnus Danielson wrote:
The real mourning of the deceased from fellow time-nuts comes when they
realize just how much of precious gear has been lost forever.
Of course, we would like to know precisely when the precious gear was lost.
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Mark J. Blair, NF6X n
millions on the licensing fees, thus
funding the H-maser that I'll be buried with.
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That sounds (and looks) thoroughly delightful! With a proper external
reference, you'll be able to synthesize another reference at *precisely* the
wrong frequency. :)
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with apparent time and frequency. With still more effort, one could
detect individual satellite signals and retransmit them separately with
different and varying delays, thus messing with the apparent position
relationships of the birds at any point in time.
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don't already know your position. Once your position has been
determined accurately and you have the current ephemeris data for the bird
you're listening to, you can factor out the predictable doppler and use a
single bird for timing and frequency.
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-the-shelf hardware like a TBolt.
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power is around 15W. A received signal of
-130dbm is considered strong, and tracking (but not acquisition or data
decoding) can still be done at signals approaching -160dbm.
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What is the purpose of the temperature sensor chip on the PCB, anyway? Isn't
the temperature inside the OCXO much more important?
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the cap I
managed to complete a 48-hour survey, which I wasn't able to do before. Hooray!
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more work on the power supply, so I can open it back up to
check the temperature sensor revision.
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with an oscilloscope (and everything else reads green, of course),
then I'd say that your Tbolt is likely to be in good shape.
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wireline communications or
power lines to the sites), it might be cheaper than installing hydrogen masers
and radio telescopes, designing custom aircraft and flying them overhead every
20 minutes, etc.
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position relative to the three sites by laser or
radar ranging! :-D
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On Sep 9, 2010, at 10:42, Ralph Smith ra...@ralphsmith.org wrote:
Paranoia. People making the requirements are concerned with GPS going away
due to solar flare or some other reason.
Hmm... So the decision makers think that after a solar flare or some other
reason (hostile destruction of the
an extended holdover in order to
adjust out drift based on measured round-trip times between the sites and
aircraft? In effect, flying your own low-altitude satellite over the sites when
the GPS system is down.
These may be silly ideas, but brainstorming is fun.
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a need to use its PPS output as
an absolute time marker?
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than a millimeter. That's down in the fractional
picoseconds time-wise.
It's an issue if you're doing things like interferometry at higher
frequencies..
I see a bright future selling oven-controlled speaker cables to audiophiles...
;-)
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? It's entirely possible that I've mis-remembered
the pressure level, but that's the exponent that stuck in my mind for whatever
reason.
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or responding to serial commands after a period of minutes to
hours), so I could have tried out a couple others in hopes of finding a
reliable one, followed by harvesting OCXOs from the ones that didn't make the
cut.
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networks. Have you ever followed the yellow brick road to cold under
Arms?
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and follow
for
painting markings on the ground, then. Because the chalkline string would block
the laser beam.
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their home-brewed phase noise measurement and frequency
reference distribution systems.
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up
the datasheet:
http://pdf1.alldatasheet.com/datasheet-pdf/view/184840/MACOM/AM-123/+074853VKvwOxcER.tvC+/datasheet.pdf
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time
to learn how to do
it myself, and then use that ability to add some value to the world in some
manner.
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On Aug 21, 2010, at 12:04 PM, Bob Camp wrote:
There are a number of articles on the web detailing the art of getting one of
these to work. Since it's broad band feedback you need to be a little careful
with the layout and the transformer.
Thanks, I'll continue digging.
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Mark J. Blair
for the SMA
connector version.
!!
I think I'll continue investigating a homebrew implementation for now!
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have a somewhat pointy radome to keep snow, birds, etc. from
accumulating on them), powered by +5VDC, and with at least 20dB of gain. Used
ones can be cheap.
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time
the air conditioner turns on.
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bought another power supply for the TBolt,
anyway, but at least it would be easier to build a power supply that operates
from +12VDC, a voltage that's always available in a ham shack.
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(I'm in the GPS industry,
and have access to some nice spectrum and network analyzers), but it looks like
I'm on my own.
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subscribed to your newsletter. :-)
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than phase-locking its own reference (so
I wouldn't be using its internal reference, and thus its performance wouldn't
matter).
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as I'm looking at things that will fall within its
dynamic range and noise floor. I have a lot of learning to do... ;)
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and it
has higher reverse isolation and higher gain, but a lower output intercept
point.
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is necessary
but not sufficient to have good phase noise.
Ah, I see. Is the AMC-123 or an equivalent still in production, or was
homebrewing brought up as an option because it's not?
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yet, but
I'll keep working on that. :)
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one to cancel out systematic errors?
Or how about Chicks dig guys with stable frequency and time references.
:-)
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to
compare it to. That question is what brought me to time-nuts. I'm starting to
read some papers on oscillator characterization that are collected together in
a technical note from NIST that a co-worker pointed me towards, but some of
them are giving me a math-induced headache. :)
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