I set up my ThunderBolt data logger to flag temperature spikes. Over a 10 hour
run last night it caught five of them (TOW magnitude):
104416 0.097 deg
104898 0.022 deg
115715 0.087 deg
135298 0.098 deg
138564 0.041 deg
Mark Sims wrote:
I set up my ThunderBolt data logger to flag temperature spikes. Over a 10
hour run last night it caught five of them (TOW magnitude):
104416 0.097 deg
104898 0.022 deg
115715 0.087 deg
135298 0.098 deg
138564 0.041 deg
Yes indeed, those are spikes... and rather big ones at that. They may seem
small, but they occur over a one second period. Normally I do not see more
than 1 millidegree of change over that time interval. These spikes are 20 to
100 times that. After the spike, the temperature reading
On Mon, Jul 14, 2008 at 9:44 AM, Dan Rae [EMAIL PROTECTED] wrote:
This is a spike? Surely this kind of tiny temperature variation on
the unit's board somewhere outside the oven does not have a lot of
relevance or effect on anything inside the oven where it is all
happening. And what is the
The seller of this 10811's on Ebay has raised his price to 80 bucks a pop.
He also is now listing LPRO-101 rubidiums for $99 (half of what everybody else
wants).
Also, on his pictures of the connectors, one pin is labeled LOCXO. What is
this signal?
Lots of good info on hyperbolic navigation aids
http://jproc.ca/hyperbolic/index.html
In particular, this is a nice description of Loran A
http://jproc.ca/hyperbolic/loran_a.html
Here is info on how a Phantastron works. It may not make much sense if you
don't know how tubes work.
The LOCXO ist the oven monitor.
See on the manual 10811A/B
Juerg
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Looking back through some old logs with my New and Improved Spike Finder (tm),
it appears that spikes seem to occur, on average, around every 2-3 hours and
their effect shows up in the data for around 20 seconds... so figure on 1 part
in 500 of the temperature data is corrupted by their
I just received confirmation that my payment has been cleared, so I hope
my Thunderbolt is on its way. :-)
Thanks to all involved. I hope to be trawling back through the
discussions on software soon.
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time-nuts mailing list -- time-nuts@febo.com
I was in San Francisco on Sat for the Mechanicrawl.
For time-nuts, the Long Now was probably the most interesting place. They
are building a mechanical clock that is targeted to run for 10,000 years.
They had lots of neat prototype stuff working. I didn't get the big picture.
It's half art
For a very good price I bought a Trimble Palisade the other day.
It came without the multiway plug, so I wonder if there's a source of
those anywhere?
I did find websites for programs for extracting 1PPS data, and even an
add on NMEA board, but I'm not really bothered about that.
Does anyone
In a message dated 14/07/2008 21:09:41 GMT Daylight Time,
[EMAIL PROTECTED] writes:
Does anyone have any useful information on using it, or should I open it
up and replace the multiway socket and see if I can do something else
other than mount it outside as another time standard?
Thanks
Does anyone have any useful information on using it, or should I open it
up and replace the multiway socket and see if I can do something else
other than mount it outside as another time standard?
Google for Trimble Palisade or see if this helps:
Trimble Palisade GPS 1 PPS time source
My own gut feeling is that it is a glitch making its way through one of the
power supplies. Its decay looks like it could be capacitive... Pr thermal.
or (fill in the blank)
I'm using the brick power supply povided and it is possible that they generate
transients, or poorly react to normal
Over the past 2 days, the DAC voltage of my trimble thunderbolt has increased
in a linear mannar from 0.332 to 0.336 or about 2mV per day.
I assume this voltage will sooner or later saturate? Or is this effect the
aging of the crystal in the OCXO that keeps on going at this rate? If the
I picked up a couple of prewired cables for the Palisade from tiger-
tech.biz
They had both short (~2 or 3m) and much longer cables in stock. Prices
weren't bad, either, as I recall.
Bob
On Jul 14, 2008, at 1:08 PM, David Ackrill wrote:
For a very good price I bought a Trimble Palisade the
David Ackrill wrote:
I just received confirmation that my payment has been cleared, so I hope
my Thunderbolt is on its way. :-)
Thanks to all involved. I hope to be trawling back through the
discussions on software soon.
Mine arrived safely a few days ago - excellent!
My thanks to those
Over the past 2 days, the DAC voltage of my trimble
thunderbolt has increased in a linear mannar from
0.332 to 0.336 or about 2mV per day.
Nice. Keep logging for a few more weeks or even months
and tell us what happens, long-term.
I assume this voltage will sooner or later saturate? Or
is
I have both a red-box unit with the single input power supply (internally it
has a ATT DC-DC converter brick and lots of filtering stuff) and two of the
three-supply units. All of them show the same temperature glitches. I have
had one running off of a Tektronix PS-503A linear lab supply and
That seem to be fairly normal for an oscillator to undergo some initial quick
aging after being powered on after a long rest. It should settle down after a
week or so. My FTS-4060 cesium unit was aging at about 40mV a day. After a
week it was down to around 10mV. After two weeks, it
Looking back through some old logs with my New and Improved Spike
Finder (tm), it appears that spikes seem to occur, on average, around
every 2-3 hours and their effect shows up in the data for around 20
seconds... so figure on 1 part in 500 of the temperature data is
corrupted by their
i've noticed two primary complaints (with which i agree) - the PPS
output is too short and positions don't seem to be output by default.
i'm probably going to add an initializer to make the thunderbolt emit
position data and crank up the 1PPS pulse length to something
reasonable - at least
The nature of the spikes are that they show an instantaneous impulse 100mV rise
in the temperature readings between two 1 second samples. The rise exists for
one sample then decays over around 20 seconds. There is no way that any CPU
(or bus) activity can generate a heat pulse that would
The ThunderBolt does not seem to have a way to control the width of the 1PPS
pulse in software... My data dumper program for the thing requests and
processes just about every message the thing can handle (and a few that it
cannot) and I have not seen any messages that can control the pulse
Well, for only $29K you can KNOW what time it is... and it has the high
performance cesium slinger.
Or for $200 +/- you can get pretty darn close with a ThunderBolt...
_
Need to know now?
eBay has partitioned itself lately into items with excessive starting bids,
and items which are real bargains. But yeah, I already paid for all the
Cs/Rb sources flying around overhead, damned if I'm not going to use 'em!
-- john
-Original Message-
From: [EMAIL PROTECTED]
I made a second version (same firmware) of the Thunderbolt monitor. This one
uses the plastic DIP version of the processor mounted on a small Radio Shack
proto board and it uses a gorgeous Noritake Vacuum Fluorescent display.
The interface between the Noritake and any ordinary LCD display is
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