Neville Michie wrote:
Is this calibrator gated?
Back in the stone age when I started work, a CRO (with a 5BP1 tube in
it) was calibrated in time by a gated oscillator
that put little pips on the trace at 1 microsecond intervals.
So that the markers would not crawl across the screen the
Hello Community,
currently I am trying to revive a Stanford Research FS700 Loran-C
Frequency Standard
(http://www.thinksrs.com/products/FS700.htm
http://www.thinksrs.com/products/FS700.htm ) .It shows an error
message Pattern Memory Test FAIL.
Unfortunately the O S manual is missing the
Hi,
I have just commissioned a temperature control for my LPRO rubidium
oscillator.
When I read the specs I noticed that at 18V supply and about 40*C the
unit only requires about
8 watts. That is getting close to what my stand-alone power source
can maintain.
Running at a higher temperature
Gents,
over the course of the last year I have lost track on what is the state
of the art in GPS timinig receivers. Is there still something like the
MOTOROLA M12+ available or a descendant or a compatible model? Or what
would otherwise be the choice of today?
Best regards and TIA
Ulrich
Martin,
SRS would be happy to sell a hard copy of the manual
to you, but they don't give anything away!
Pete Rawson
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and
You've the M12M timing GPS from iLotus, that bought the GPS business
from Motorola. Functionally equivalent to the M12+, same footprint, and
better characteristics (includes an TCXO so it is lest prone to
temperature variations, and also claims improved sensitivity). You can
find more
I was probing at the cathode not at G1 FWIW.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Bruce Griffiths
Sent: 10 September 2008 03:14
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Ancient OCXO in scope calibrator.
A completely unused (had to open the perforations on the plastic bag inside
the box) NOS nuvistor substitution made no difference to the effect of
probing.
D.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Neon John
Sent: 10 September 2008 01:20
To:
Now that's an interesting thought.
How should one go about specifying such a part?
Do you have any experience of doing this? We'd be looking at (I guess) a
turnover from almost short circuit to darn near open circuit over a range of
a few degrees centred on 75 celsius. Do such beasties
The interlinked cup hooks are a fuse or fusible link. there may be
others as EIA only standardized symbols in the late 60's and Mid 70's
Just look in older HP documentation and see how many symbols they
used for zener diodes!.
On Wed, Sep 10, 2008 at 1:12 PM, David C. Partridge
[EMAIL
Hello Pete,
thank you for your quick reply.
Your comment SRS would be happy to sell a hard copy of the manual to
you, but they don't give anything away!
exactly matches my experience with this company; they charge $38.50 for
a replacement manual,
$30 for handling and bank transfer costs, and
Hi Neville,
You said . . . I mounted a12V 1 watt 40mm brushless DC ball bearing fan, . .
Damn, is that thing turbo charged ?
BillWB6BNQ
Neville Michie wrote:
Hi,
I have just commissioned a temperature control for my LPRO rubidium
oscillator.
When I read the specs I noticed that at
I have just commissioned a temperature control for my LPRO rubidium
oscillator.
The next step is to get on with the building of the gear to measure
how well the LPRO now performs at constant temperature.
How much did it drift before your recent work? How did you measure it?
--
These
Hi Neville,
In all seriousness, I thought the Rubidium physics package is heated for
reasons. Now that you are heat sinking it, what has happened to the current
draw
for the whole unit ? Or am I misunderstanding something ?
BillWB6BNQ
Neville Michie wrote:
Hi,
I have just commissioned
Ulrich,
Living where you do, I'd suggest checking out the U-BLOX range of
modules. The model you need is the LEA-5T. The LEA-5 family is
state-of-the-art, and I believe uses an ATMEL DSP software baseband
engine (with reportedly one million correlators!)
I have two of their modules (LEA-5H and
WB6BNQ wrote:
Hi Neville,
In all seriousness, I thought the Rubidium physics package is heated for
reasons. Now that you are heat sinking it, what has happened to the current
draw
for the whole unit ? Or am I misunderstanding something ?
BillWB6BNQ
He's not cooling it, he's
Hello Murray,
the uBlox GPS are very excellent, yes, but their timing accuracy is still
nowhere near that of the M12M. They also require external sawtooth correction
to
achieve the stated accuracy. They do work better than M12's in a mobile
environment, and are more sensitive.
BTW: I
Out of curiosity, I tried to find something that might do the job.
The only PTC thermistor I could find was from Digikey (mfr GE
Infrastructure) with a transition temperature in the right range was 70C and
rated at only 25 volts, and that was 50 Ohms at 25C :-(
D.
-Original Message-
Hi Hal,
My aim is to run a stable time standard to analyse the long term
performance of clocks.
Part of this project is to set up a power support system so that
logging is never interrupted.
Now the LPRO draws less power at lower supply voltage and higher
operating temperature
and decreasing
Hi Bill,
the lamp and detector of the LPRO are both thermostat controlled.
At higher case temperature the power to heat them decreases as do the
temperature gradients in the device. From 17watts at 32V supply at 0*C
it can be reduced to 7.5 watts at 18 v supply and 45*C.
Although spec'ed to 70*C
IIRC, someone had some of the heads used to extend the range of the HP 5355A
Plug-In. Can that person contact me. I have a 5355A coming (hopefully a
working one !!) and would like to try one or two.
Tnx, Dick, W1KSZ
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