Hi Didier --
I have written a bunch of simple programs for GPIB data gathering, using
perl and the linux-gpib libraries under Linux. However, the code is
pretty straightforward and it should be easy to extract the command
strings to send to the counter. From that, you should be able to
re-write
Didier, a few comments embedded below.
John
Didier Juges said the following on 10/22/2006 10:34 AM:
Hi Warner,
Does it mean I should divide the 10 MHz down to 1 Hz output and use the
5370 to measure TI compared to it's internal timebase once per second,
and feed that to the
Didier Juges wrote:
OK, here is my problem. I do not think it is a unique problem, based on
recent mail :-)
I have read about the Allan Deviation and I understand the principle,
even though the nuances between the 3 basic Allan deviations escape me
at the moment, but I am sure it will
Didier Juges [EMAIL PROTECTED] wrote:
OK, here is my problem. I do not think it is a unique
problem, based on recent mail :-)
I have read about the Allan Deviation and I understand
the principle, even though the nuances between the 3
basic Allan deviations escape me at the moment, but I
Hello everyone,
I have, until now, resisted the urge to buy a GPS navigation system for
my car.
However, I now have to do some traveling and new and unknown addresses
keep popping up.
There are several different GPS units on the market and they all look OK
(i guess).
I just want to know which
Hi John,
I got zip (does not work either :-)
I remember going through something like that a while back on one of my
servers, I have no recollection how I fixed it :-(
The files look pretty small, can you email them to me?
Interestingly, on my ISP's server (Linux too), I have no problem
Dr Bruce Griffiths said the following on 10/22/2006 07:19 PM:
An inexpensive modern time interval counter with a power dissipation of
less than 10 watts and a resolution comparable to the 5370 would be
useful for such comparisons especially if the experiment lasts several
months.
I don't
George,
I have been happily using a Garmin Quest for about three years now. There
are of course newer versions from this manufacturer, who have a very good
reputation. Tom-Tom are also very popular in the UK, but have no experience
of using them.
Good hunting!
Rob Kimberley
-Original
xaos wrote:
Hello everyone,
I have, until now, resisted the urge to buy a GPS navigation system for
my car.
However, I now have to do some traveling and new and unknown addresses
keep popping up.
There are several different GPS units on the market and they all look OK
(i guess).
I
Didier
If you are going to use a PPS divider to divide the oscillator frequency
down to 1Hz, you will need to measure the inherent jitter of the divider
to ensure that it doesn't degrade the measurement resolution. It may be
necessary to resynchronise the divided output using a fast D flipflop
How's the timing accuracy?
Does it display GPS time or does it have it's own clock?
-RL
Robert Lutwak, Senior Scientist
Symmetricom - Technology Realization Center
34 Tozer Rd.
Beverly, MA 01915
(978) 232-1461 Voice
Dr Bruce Griffiths [EMAIL PROTECTED] wrote:
Most GPS receivers with higher frequency outputs than 1Hz, phase
modulate the high frequency output in this way and the datasheets
explicitly indicate this.
Thus there would appear to be little advantage in phase locking to the
10KHz signal with
Tim Shoppa wrote:
Dr Bruce Griffiths [EMAIL PROTECTED] wrote:
Most GPS receivers with higher frequency outputs than 1Hz, phase
modulate the high frequency output in this way and the datasheets
explicitly indicate this.
Thus there would appear to be little advantage in phase locking to
Dr Bruce Griffiths said the following on 10/22/2006 07:33 PM:
Didier
If you are going to use a PPS divider to divide the oscillator frequency
down to 1Hz, you will need to measure the inherent jitter of the divider
to ensure that it doesn't degrade the measurement resolution. It may be
Dr Bruce Griffiths said the following on 10/22/2006 08:24 PM:
Reading between the lines on the Jupiter GPS receiver datasheet it would
appear that the 10KHz output is phase modulated at 1Hz to realign it to
successive PPS output pulses. As the PPS jitters about so does the 10KHz
signal.
Dr Bruce Griffiths wrote:
Reading between the lines on the Jupiter GPS receiver datasheet it would
appear that the 10KHz output is phase modulated at 1Hz to realign it to
successive PPS output pulses. As the PPS jitters about so does the 10KHz
signal.
Most GPS receivers with higher
I really like the 5334s (either A or B; the A is actually a more
featureful instrument than the B) and I have five or six of them; I
didn't pay more than $100 for any of them. And, most of them have
10811As, so I figure worst case I can throw the counter out and still
get my money's worth from
John Ackermann N8UR wrote:
Dr Bruce Griffiths said the following on 10/22/2006 07:33 PM:
Didier
If you are going to use a PPS divider to divide the oscillator frequency
down to 1Hz, you will need to measure the inherent jitter of the divider
to ensure that it doesn't degrade the
You can do a lot worse than straight TTL. Some useful graphs on pages 102
and 103 of Rohde's Microwave and Wireless Synthesizers: Theory and Design.
Hint: Look it up at www.amazon.com and you can view those two pages, if you
search within the book for the phrase 170 dB.
-- john, KE5FX
The few
John Miles wrote:
You can do a lot worse than straight TTL. Some useful graphs on pages 102
and 103 of Rohde's Microwave and Wireless Synthesizers: Theory and Design.
Hint: Look it up at www.amazon.com and you can view those two pages, if you
search within the book for the phrase 170 dB.
Didier Juges wrote:
Dr Bruce Griffiths wrote:
In principle this measurement could be made with a time interval counter:
PPS - START
delayed 10KHz - STOP
Vary the delay and watch the jitter jump when the leading edge of the
PPS signal occurs during the 10KHz burst which was phase
Didier Juges wrote:
Dr Bruce Griffiths wrote:
In principle this measurement could be made with a time interval counter:
PPS - START
delayed 10KHz - STOP
Vary the delay and watch the jitter jump when the leading edge of the
PPS signal occurs during the 10KHz burst which was phase
Didier Juges wrote:
Dr Bruce Griffiths wrote:
In principle this measurement could be made with a time interval counter:
PPS - START
delayed 10KHz - STOP
Vary the delay and watch the jitter jump when the leading edge of the
PPS signal occurs during the 10KHz burst which was phase
Dr Bruce Griffiths wrote:
Didier Juges wrote:
Dr Bruce Griffiths wrote:
In principle this measurement could be made with a time interval counter:
PPS - START
delayed 10KHz - STOP
Vary the delay and watch the jitter jump when the leading edge of the
PPS signal occurs during
Dr Bruce Griffiths wrote:
Didier Juges wrote:
Dr Bruce Griffiths wrote:
In principle this measurement could be made with a time interval counter:
PPS - START
delayed 10KHz - STOP
Vary the delay and watch the jitter jump when the leading edge of the
PPS signal occurs during
Bruce,
Thanks for the reminder. That was my intention. I was planning to use a
74HC74, and whatever dividers I can get my hands on. I am not looking
forward to daisy chain seven 7490s, so I will probably try something
else. With the D flip-flop, the dividers don't really matter, as long as
Didier Juges wrote:
Dr Bruce Griffiths wrote:
Didier Juges wrote:
Dr Bruce Griffiths wrote:
In principle this measurement could be made with a time interval counter:
PPS - START
delayed 10KHz - STOP
Vary the delay and watch the jitter jump when the leading
Didier Juges wrote:
Bruce,
Thanks for the reminder. That was my intention. I was planning to use a
74HC74, and whatever dividers I can get my hands on. I am not looking
forward to daisy chain seven 7490s, so I will probably try something
else. With the D flip-flop, the dividers don't
Dr Bruce Griffiths wrote:
Didier Juges wrote:
Dr Bruce Griffiths wrote:
Didier Juges wrote:
Dr Bruce Griffiths wrote:
In principle this measurement could be made with a time interval counter:
PPS - START
delayed 10KHz - STOP
Vary
Didier Juges wrote:
Bruce,
Thanks for the reminder. That was my intention. I was planning to use a
74HC74, and whatever dividers I can get my hands on. I am not looking
forward to daisy chain seven 7490s, so I will probably try something
else. With the D flip-flop, the dividers don't
Didier Juges wrote:
Dr Bruce Griffiths wrote:
Didier Juges wrote:
Dr Bruce Griffiths wrote:
Didier Juges wrote:
Dr Bruce Griffiths wrote:
In principle this measurement could be made with a
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