The trip point is specd to be between -3 to +3, which is why 5V works,
especially since the trip point is usually positive. I would set it
around 1.5V. The transmitters are required to swing +/- 5V.
I'm not sure the 232 allowed lower voltage as much as all we had to
work with were charge
Related to time-nuttery as astonomical observation was used for time-keeping
until C20.
Sir Patrick Moore, the great amateur astonomer died yesterday at the age of 89.
A gentleman, astronomer, and true scholar. His death was predicatable as he's
been very ill for a long time, but nonetheless
I am logging the data from this strange master clock, and the none of the
bits 42 through 44 are stuck. Good idea, though. I have just checked
tonight, and the DOW is indicating as 5 (Friday), despite it only being
Monday.
Good idea though.
On 9 December 2012 23:24, mike cook mc235...@gmail.com
That's the funny thing, the parity bit is correct for the value of DOW,
just that the DOW value is wrong.
On 9 December 2012 23:27, Azelio Boriani azelio.bori...@screen.it wrote:
Is the parity bit P3 consistent? It protects the day of the month and that
of the week.
On Sun, Dec 9, 2012 at
Hi
On Dec 9, 2012, at 9:07 PM, WB6BNQ wb6...@cox.net wrote:
Bob,
I don't know where you got your multiple versions.
Quite possibly from having spent the last 40 years in the business of designing
and building OCXO's.
RETRACE deals with the object in a fully realized steady state
Hi
Perkin Elmer does everything that EGG used to do - same company, new name.
Bob
On Dec 9, 2012, at 11:07 PM, Jim Lux jim...@earthlink.net wrote:
On 12/9/12 5:38 PM, Bob Camp wrote:
HI
Princeton was part of EGG for quite a while. EGG bought out Perkin Elmer
in the 90's. The EGG name
Hi
You may have a TTL output level version of the FE.
Bob
On Dec 10, 2012, at 1:24 AM, James Peroulas ja...@peroulas.com wrote:
For the record, my device did have an OSMT (not Hirose) connector on the
DDS board.
I'm having trouble getting the internal RS232 port on the DDS board to work
On 10 December 2012 09:24, David C. Partridge
david.partri...@perdrix.co.uk wrote:
Related to time-nuttery as astonomical observation was used for time-keeping
until C20.
Sir Patrick Moore, the great amateur astonomer died yesterday at the age of
89.
Although considered an amateur, I
Bert,
I have been waiting for more details to become available. Thanks for the
update.
Not sure exactly what this means:
but I have to depend on volunteers to do the drawings and they have to make
their time available when convenient.
Depending on if the input is in some kind of standard,
If it were me, I'd suspect that my window of bits is off
to the left or right by one bit. The old first bit is
called zero problem.
And the relationship between 7- 3 and 5- 1 makes me
wonder.
Chris
On 12/10/2012 5:00 AM, Tom Harris wrote:
I am logging the data from this strange master
I have an EIP counter with a problem, stashed, that I need to look at
eventually. So have been following the thread a bit.
If you guys get somewhere conclusive (or not), might be nice to post a
summary of all important details, techniques, or circuit notes beyond
the manual, found, to this
Not sure why you would want to do this but, if you have a Rb, such as an
LPRO-101 or others, there is a signal that lets you know the Rb is 'locked'.
You could use that to drive a relay that would switch the output of the Rb
to the external input of your device.
This presumes you do not have to
On 12/10/2012 7:10 AM, David Kirkby wrote:
On 10 December 2012 09:24, David C. Partridge
david.partri...@perdrix.co.uk wrote:
Related to time-nuttery as astonomical observation was used for time-keeping
until C20.
Sir Patrick Moore, the great amateur astonomer died yesterday at the age of 89.
I have an EIP counter with a problem, stashed, that I need to look at
eventually. So have been following the thread a bit.
If you guys get somewhere conclusive (or not), might be nice to post a
summary of all important details, techniques, or circuit notes beyond
the manual, found, to
On 12/9/12 10:14 PM, DaveH wrote:
http://www.scmagazine.com.au/News/325731,researchers-find-crippling-flaws-in
-global-gps.aspx
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On 12/9/12 10:14 PM, DaveH wrote:
http://www.scmagazine.com.au/News/325731,researchers-find-crippling-flaws-in
-global-gps.aspx
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Me too.
I have two 545A's, one of which works and the other of which has issues with
Band 3, failing to read in a very interesting pattern suggesting a YIG
filter issue, probably the control circuit.
Just no time to chase it right now.
Please post the resolution.
Thanks.
Joe
-Original
Chris and I took this offline so as not to bother the time-nuts thread.
Hopefully we can work it through. Chris is lucky as he only has a band 2
problem.
Band 3 in nastier o deal with.
Chris since several have expressed interest perhaps we just add them to
your new thread.
We can still skype for
31-bit is 186dB... with what do you compare that device? What kind of
reference is needed?
On Sun, Dec 9, 2012 at 11:18 PM, Bob Camp li...@rtty.us wrote:
Hi
It's the big brother of the ADS127x parts that I mentioned a little
while back. I'm sure it works quite well. The 127x's are fine
Or join and post to the EIP_Microwave Yahoo group - lots of good info showing
up there!
Steve
WB0DBS
On Dec 10, 2012, at 8:00 AM, J. L. Trantham jlt...@att.net wrote:
Me too.
I have two 545A's, one of which works and the other of which has issues with
Band 3, failing to read in a very
In message
CAL8XPmN8PbcSEfmRCiude+sYCX3kawBF6h4T0=n0n0emxlx...@mail.gmail.com, Azelio
Boriani writes:
31-bit is 186dB... with what do you compare that device? What kind of
reference is needed?
It's not 31 noise-free bits, but the SNR is in the 120-130dB territory.
--
Poul-Henning
I'm already over there. The thread just migrated back here.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Steve
Sent: Monday, December 10, 2012 8:43 AM
To: Discussion of precise time and frequency measurement
Subject: Re:
31 bits is just a convenient word size that comes out of the on-chip filter,
and
does not really relate to performance. Better to look at SNR which, at worst
case, is 120dB in high-res mode. That indicates performance just under 20 bits,
typical for better monolithic sigma-delta converters.
Le 10/12/2012 13:44, Chris Howard a écrit :
If it were me, I'd suspect that my window of bits is off
to the left or right by one bit. The old first bit is
called zero problem.
And the relationship between 7- 3 and 5- 1 makes me
wonder.
Chris
On 12/10/2012 5:00 AM, Tom Harris wrote:
I am
I see that there is a high resolution 130dB mode too that can give 21 bits
@ 250 samples per second, good for very slow, high resolution DMTD (but
also very stable voltage reference and ADC temperature, seems very
challenging).
On Mon, Dec 10, 2012 at 4:26 PM, Robert LaJeunesse
Yes. There is a Yahoo Group spwecifically about EIP products.
-John
I have an EIP counter with a problem, stashed, that I need to look at
eventually. So have been following the thread a bit.
If you guys get somewhere conclusive (or not), might be nice to post a
summary
Hi
What is atypical about these parts is:
1) The excellent noise performance inside 10 Hz
2) The built in Nyquist filters
The first is very impressive compared to just about anything else out there.
The second is available in some, but not all similar parts.
Bob
-Original Message-
Hi
The oven monitor pin on most OCXO's is not a real good thing to switch
directly off of. They generally go low well before the output is very
stable. A timer is run off of the oven monitor pin would give you a pretty
good switch point (switch X minutes after the oven monitor shows good).
Bob
Is shipped, tracking number
1Z30VR960337713831
due Wednesday
Didier
Sent from my Droid Razr 4G LTE wireless tracker.
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and
Thanks, Didier, if you ever find a mainframe for it, please keep me in
mind.
Thanks, -Don
--
From: shali...@gmail.com
Sent: Monday, December 10, 2012 11:23 AM
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Well, that obviously went to the wrong place.
That was a private message, sorry for the bandwidth.
Didier
On Mon, Dec 10, 2012 at 12:06 PM, dlewis6767 dlewis6...@austin.rr.comwrote:
Thanks, Didier, if you ever find a mainframe for it, please keep me in
mind.
Thanks, -Don
rlajeune...@sbcglobal.net said:
Nonetheless 20 bits indicates a matching reference would have to hold 1PPM
over temperature, no simple task.
The initial post called it TI's ADS1282 geophone ADC.
I'm pretty sure that the geologists using geophones don't care about super
low frequencies so
Hi
When your sound source is a thumper truck, you do indeed care about some
pretty low frequencies.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Hal Murray
Sent: Monday, December 10, 2012 1:33 PM
To: Discussion of precise time
It is 31 bits with no missing codes. Usually missing codes is of concern in
feedback systems, but I don't see the use in a geophone. Perhaps they will
average the digital signal further to reduce the noise, hence the noisy bits.
___
time-nuts
I do not understand how anyone can guaranty no missing codes when the lower
11 bits are essentially noise? (31 bits resolution versus 20 effective bits)
On Mon, Dec 10, 2012 at 2:19 PM, li...@lazygranch.com wrote:
It is 31 bits with no missing codes. Usually missing codes is of concern
in
Am 10.12.2012 21:53, schrieb Didier Juges:
I do not understand how anyone can guaranty no missing codes when the lower
11 bits are essentially noise? (31 bits resolution versus 20 effective bits)
With that much noise it is really guaranteed that no code will be missing.
:-) Gerhard
How long does it take to prove it?
And what's the point?
On Mon, Dec 10, 2012 at 3:04 PM, Gerhard Hoffmann dk...@arcor.de wrote:
Am 10.12.2012 21:53, schrieb Didier Juges:
I do not understand how anyone can guaranty no missing codes when the
lower
11 bits are essentially noise? (31 bits
Regarding feedback loops, I had a brain fart. I mean monotonic and no missing
codes, not no missing codes in general.
I think it was Fluke or Analog that had a small booklet on understanding data
converter specifications.
___
time-nuts mailing
Hi
I suspect you can prove it mathematically. You could also just sit there and
watch what it puts out for a year or so. With a reasonable ramp it likely would
put out all codes. That's not to say you could prove they are in order, only
that you saw all 4 billion codes. More or less:
1,000
Integrating converters including delta-sigma converters can be no
missing codes by design without being able to take advantage of the
full resolution that implies. Integral nonlinearity, drift, and noise
will limit the usable resolution.
On Mon, 10 Dec 2012 15:08:38 -0600, Didier Juges
The gain drift is specified at 2ppm per degree C. There are
provisions for a calibration cycle but that requires external
multiplexing.
On Mon, 10 Dec 2012 07:26:55 -0800 (PST), Robert LaJeunesse
rlajeune...@sbcglobal.net wrote:
. . .
typical for better monolithic sigma-delta converters.
Ended up with a gently used trimble thunderbolt a few months ago, and
been trying to figure out the best settings to use (time constant,
damping, etc.) for best performance.
I got distracted though. There is something which I find rather
annoying, and I'm spending more time messing with this
Hi
The oven in the OCXO keeps the crystal at a constant temperature. It is normal
for the TBolt it's self to idle 10 to 20C above ambient. The temperature sensor
is located near the 9 pin D connector. It shows a temperature somewhere in
between the ambient and the OCXO case temperature. Some
Hi Sarah,
The temperature you are seeing is that of a Dallas IC mounted on the main PC
board. You are seeing the ambient temp of the board, not inside the OCXO
oven.
Regards,
Tom
- Original Message -
From: Sarah White kuze...@gmail.com
To: Discussion of precise time and frequency
Sarah,
The reported temperature is not the oven temp, but rather the temp of the
circuit board just behind the DB-9 serial connector. As far as I know, the
actual oven temp is not available outside the OCXO.
Regards,
geo
On Mon, Dec 10, 2012 at 5:15 PM, Sarah White kuze...@gmail.com wrote:
I agree, but there is a difference between something that you should be
able to achieve by design and being able to prove it, or even if it's
useful in practice.
In a case like this, the wide span between resolution and effective bits
makes me wonder what's the point of advertising the former
I feel like shouldn't need to fuss with ambient conditions this heavily
for an OCXO, and find myself researching construction / design for a DIY
outer-oven to wrap the thunderbolt in.
Anyone have experience with non-stable temperature on a trimble thunderbolt?
The temperature you see is not from
In message tilcc892a6ntfk64t2nljm92idr92df...@4ax.com, David writes:
The gain drift is specified at 2ppm per degree C. There are
provisions for a calibration cycle but that requires external
multiplexing.
That's the really smart thing about this particular chip: You can
drive the
On 12/10/2012 5:22 PM, Bob Camp wrote:
Hi
The oven in the OCXO keeps the crystal at a constant temperature. It is
normal for the TBolt it's self to idle 10 to 20C above ambient. The
temperature sensor is located near the 9 pin D connector. It shows a
temperature somewhere in between the
In message camqqfunudahc9rdrk0g8hxo_kohs+bndeilnqspq1_b2nqk...@mail.gmail.com
, Didier Juges writes:
I do not understand how anyone can guaranty no missing codes when the lower
11 bits are essentially noise? (31 bits resolution versus 20 effective bits)
No missing codes is guaranteed by
I believe that the high temperature alarm you see is triggered at 50 degrees
C. If that is what you're seeing without artificially raising the temperature
of the Thunderbolt by insulating it so it can't radiate the heat, what I said
about replacing the chip is correct but if it is staying
On 12/10/2012 6:10 PM, Arthur Dent wrote:
I believe that the high temperature alarm you see is triggered at 50 degrees
C. If that is what you're seeing without artificially raising the
temperature
of the Thunderbolt by insulating it so it can't radiate the heat, what I said
about
Sarah,
That temperature sensor does have an effect on the final outcome as it is part
of
the internal equation. So buffering the ambient temperature is important.
You do not need to go crazy, but having it contained in a box with some small
amount
of heat applied and maintained by some
On Mon, 10 Dec 2012 23:01:49 +, Poul-Henning Kamp
p...@phk.freebsd.dk wrote:
In message tilcc892a6ntfk64t2nljm92idr92df...@4ax.com, David writes:
The gain drift is specified at 2ppm per degree C. There are
provisions for a calibration cycle but that requires external
multiplexing.
That's
Hi
It's not at all uncommon for the seismic guys to go a bit uber-nuts on clean
supplies and references.
Bob
On Dec 10, 2012, at 7:54 PM, David davidwh...@gmail.com wrote:
On Mon, 10 Dec 2012 23:01:49 +, Poul-Henning Kamp
p...@phk.freebsd.dk wrote:
In message
If it *was* missing codes in reality, it would not be the first time
TI made that kind of mistake. One of their not so early multi-slope
integrating converters was advertised to *not* return both plus zero
and minus zero which was a big feature at the time . . . but it did.
Almost nobody noticed
Hi Charles,
Well, perhaps you are not looking close enough. That is you need to be
observing
at a finer level of comparison. The changes, observed here and at another
location, are in parts in 10-10 to 10-11 range, sometimes larger. At one of the
locations there was a direct correlation to
I've got a couple questions on a early S/N 5061A I got a few days ago.
It took a couple days but the Ion Pump current is now down to zero
or at least less then one division on the meter.
I'm able to get the unit to go into continuous operation mode by
following the TURN-ON PROCEDURES but have
a
On 12/10/2012 02:53 PM, Jim Lux wrote:
On 12/9/12 10:14 PM, DaveH wrote:
http://www.scmagazine.com.au/News/325731,researchers-find-crippling-flaws-in
-global-gps.aspx
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