DATUM 9390 Info wanted
Hi,
I was curious if anyone could tell me a little bit more about the DATUM 9390
clocks. Primarly whether it uses a propatary antenna & whether it is
indeed gps based or loran or ?? Also if anyone has a manual available
that'd be cool.
Thanks
--Don
Hi Don,
Which 9390 do you have? i.e. 9390-xxxx. Have one or two manuals here. There
are many variants, so a model number would be a good start.
Datum's 9390 products were GPS using Trimble receivers and antennae.
Rob Kimberley
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Don Wisdom
Sent: 12 September 2007 04:21
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] DATUM 9390 Info wanted
); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+rk=timing-consultants.com@febo.com RETRY
Hi,
I was curious if anyone could tell me a little bit more about the DATUM 9390
clocks. Primarly whether it uses a propatary antenna & whether it is
indeed gps based or loran or ?? Also if anyone has a manual available
that'd be cool.
Thanks
--Don
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
I have several (I think 8 or 10) of the 9390 series receivers. They all work
off of 5 volt antennas, and I use an HP antenna with mine through a
splitter. Some use a Rubidium, some an OCXO and some a TCXO. Most of mine
have Rubidiums in them. Interestingly, you can typically purchase the whole
receiver for a lot less than just the Rubidium on ebay. Just about every one
of mine locked right on, after a short while, and displayed the proper time.
However, most of them displayed the wrong date of the year. So, for timing
and frequency purposes they work just fine. I believe only two of the lot
also displays the correct date. I bought them all from ebay, and, so, they
came from all over the country. I have no history on any of them. Regards -
Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Don Wisdom
Sent: Tuesday, September 11, 2007 11:21 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] DATUM 9390 Info wanted
); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+mfeher=eozinc.com@febo.com RETRY
Hi,
I was curious if anyone could tell me a little bit more about the DATUM 9390
clocks. Primarly whether it uses a propatary antenna & whether it is
indeed gps based or loran or ?? Also if anyone has a manual available
that'd be cool.
Thanks
--Don
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Hi Mike,
If the units are showing the wrong date, then I'm sure this due to the GPS
week rollover bug. The frequency and 1PPS will be fine, but they cannot
compute the right date as the 1024 bits have rolled over and either the GPS
engine used or the firmware on board cannot correct for the anomaly.
Rob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Mike Feher
Sent: 12 September 2007 09:33
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] DATUM 9390 Info wanted
); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+rk=timing-consultants.com@febo.com RETRY
I have several (I think 8 or 10) of the 9390 series receivers. They all work
off of 5 volt antennas, and I use an HP antenna with mine through a
splitter. Some use a Rubidium, some an OCXO and some a TCXO. Most of mine
have Rubidiums in them. Interestingly, you can typically purchase the whole
receiver for a lot less than just the Rubidium on ebay. Just about every one
of mine locked right on, after a short while, and displayed the proper time.
However, most of them displayed the wrong date of the year. So, for timing
and frequency purposes they work just fine. I believe only two of the lot
also displays the correct date. I bought them all from ebay, and, so, they
came from all over the country. I have no history on any of them. Regards -
Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Don Wisdom
Sent: Tuesday, September 11, 2007 11:21 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] DATUM 9390 Info wanted
); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+mfeher=eozinc.com@febo.com RETRY
Hi,
I was curious if anyone could tell me a little bit more about the DATUM 9390
clocks. Primarly whether it uses a propatary antenna & whether it is
indeed gps based or loran or ?? Also if anyone has a manual available
that'd be cool.
Thanks
--Don
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Rob -
I agree. However, usually we all know the correct date, so, that is not an
issue with me. In fact, showing the date as a total number of days in a year
is confusing to me anyway. So, as long as they lock, show hours and seconds,
discipline the internal standard, the rest is a piece of cake. At least I am
happy. Besides, my cheap WWVB clocks always show the correct date, of
course, so does my cell phone. BTW, I found about a 2 second discrepancy
between my cell phone time and GPS time. For us time nuts, that is a whole
lot. I have not had a chance to investigate. We may be time nuts, but I
think for the most of us, time is a precious commodity. - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Rob Kimberley
Sent: Wednesday, September 12, 2007 7:01 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] DATUM 9390 Info wanted
); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+mfeher=eozinc.com@febo.com RETRY
Hi Mike,
If the units are showing the wrong date, then I'm sure this due to the GPS
week rollover bug. The frequency and 1PPS will be fine, but they cannot
compute the right date as the 1024 bits have rolled over and either the GPS
engine used or the firmware on board cannot correct for the anomaly.
Rob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Mike Feher
Sent: 12 September 2007 09:33
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] DATUM 9390 Info wanted
); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+rk=timing-consultants.com@febo.com RETRY
I have several (I think 8 or 10) of the 9390 series receivers. They all work
off of 5 volt antennas, and I use an HP antenna with mine through a
splitter. Some use a Rubidium, some an OCXO and some a TCXO. Most of mine
have Rubidiums in them. Interestingly, you can typically purchase the whole
receiver for a lot less than just the Rubidium on ebay. Just about every one
of mine locked right on, after a short while, and displayed the proper time.
However, most of them displayed the wrong date of the year. So, for timing
and frequency purposes they work just fine. I believe only two of the lot
also displays the correct date. I bought them all from ebay, and, so, they
came from all over the country. I have no history on any of them. Regards -
Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Don Wisdom
Sent: Tuesday, September 11, 2007 11:21 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] DATUM 9390 Info wanted
); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+mfeher=eozinc.com@febo.com RETRY
Hi,
I was curious if anyone could tell me a little bit more about the DATUM 9390
clocks. Primarly whether it uses a propatary antenna & whether it is
indeed gps based or loran or ?? Also if anyone has a manual available
that'd be cool.
Thanks
--Don
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Mike,
The 3 digit days shown are because the 9390 units evolved from their IRIG
time code units. IRIG time code use the format SS:MM:HH:DDD (or more
usually displayed DDD:HH:MM:SS) They kept the same format for the GPS units
as most had IRIG outputs also. Other manufacturers adopted a more user
friendly time display giving day/date info.
As you say not really a problem!
The 2 seconds between your cell phone and your GPS is however interesting.
Keen to know what you find out.
Cheers
Rob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Mike Feher
Sent: 12 September 2007 12:17
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] DATUM 9390 Info wanted
); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+rk=timing-consultants.com@febo.com RETRY
Rob -
I agree. However, usually we all know the correct date, so, that is not an
issue with me. In fact, showing the date as a total number of days in a year
is confusing to me anyway. So, as long as they lock, show hours and seconds,
discipline the internal standard, the rest is a piece of cake. At least I am
happy. Besides, my cheap WWVB clocks always show the correct date, of
course, so does my cell phone. BTW, I found about a 2 second discrepancy
between my cell phone time and GPS time. For us time nuts, that is a whole
lot. I have not had a chance to investigate. We may be time nuts, but I
think for the most of us, time is a precious commodity. - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Rob Kimberley
Sent: Wednesday, September 12, 2007 7:01 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] DATUM 9390 Info wanted
); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+mfeher=eozinc.com@febo.com RETRY
Hi Mike,
If the units are showing the wrong date, then I'm sure this due to the GPS
week rollover bug. The frequency and 1PPS will be fine, but they cannot
compute the right date as the 1024 bits have rolled over and either the GPS
engine used or the firmware on board cannot correct for the anomaly.
Rob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Mike Feher
Sent: 12 September 2007 09:33
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] DATUM 9390 Info wanted
); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+rk=timing-consultants.com@febo.com RETRY
I have several (I think 8 or 10) of the 9390 series receivers. They all work
off of 5 volt antennas, and I use an HP antenna with mine through a
splitter. Some use a Rubidium, some an OCXO and some a TCXO. Most of mine
have Rubidiums in them. Interestingly, you can typically purchase the whole
receiver for a lot less than just the Rubidium on ebay. Just about every one
of mine locked right on, after a short while, and displayed the proper time.
However, most of them displayed the wrong date of the year. So, for timing
and frequency purposes they work just fine. I believe only two of the lot
also displays the correct date. I bought them all from ebay, and, so, they
came from all over the country. I have no history on any of them. Regards -
Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Don Wisdom
Sent: Tuesday, September 11, 2007 11:21 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] DATUM 9390 Info wanted
); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+mfeher=eozinc.com@febo.com RETRY
Hi,
I was curious if anyone could tell me a little bit more about the DATUM 9390
clocks. Primarly whether it uses a propatary antenna & whether it is
indeed gps based or loran or ?? Also if anyone has a manual available
that'd be cool.
Thanks
--Don
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
From: "Rob Kimberley" rk@timing-consultants.com
Subject: Re: [time-nuts] DATUM 9390 Info wanted
Date: Wed, 12 Sep 2007 15:10:28 +0100
Message-ID: !&!AAAAAAAAAAAYAAAAAAAAAOYAZyOzV8ERq+LmT45ypI7CgAAAEAAAAAOo11jBnmlMjppS84iHIdkBAAAAAA==@timing-consultants.com
Rob,
The 3 digit days shown are because the 9390 units evolved from their IRIG
time code units. IRIG time code use the format SS:MM:HH:DDD (or more
usually displayed DDD:HH:MM:SS) They kept the same format for the GPS units
as most had IRIG outputs also. Other manufacturers adopted a more user
friendly time display giving day/date info.
Interesting info!
As you say not really a problem!
The 2 seconds between your cell phone and your GPS is however interesting.
Keen to know what you find out.
There are most probably several uncompensated delays in various paths of that
one-way time transfer system relating to the time-of-day.
Message propagation in the cell phone system as such, number of jumps from the
BSC to the BS, maybe also the delay down to the BSC may be uncompensated, not
to speak of the delay within the phone itself.
The traceability of some operators clocks can be highly questioned by itself.
Some operators have fairly good knowledge in these things where as others may
be content with having more or less the same time throughout their network, but
don't see it necessary to coincide with civil time (whatever that is).
I still wonder how Danish operators is supposed to follow UTC (as implied by a
new rule) when it is not acknowledged in Denmark. But then again, it would not
be the first time requirements and actual law does not coincide.
Cheers,
Magnus
On Tue, Sep 11, 2007 at 09:20:43PM -0600, Don Wisdom wrote:
Hi,
I was curious if anyone could tell me a little bit more about the DATUM 9390
clocks. Primarly whether it uses a propatary antenna & whether it is
indeed gps based or loran or ?? Also if anyone has a manual available
that'd be cool.
I have one of the rubidium version I bought off Ebay several
years ago. Somewhere (and I mean somewhere in tons of stuff) I have a
partial set of prints and a manual, though I am not sure the prints
exactly match the boards in my unit - there apparently were several
revisions of the thing.
My unit uses a very early Trimble GPS board that takes a normal
1574.2 MHz L band input (no special downconverter in the antenna or
other non standard rf stuff). I have used it with conventional GPS
antennas but as I remember by default it was wired for 12 volt rather
than 5 volt power for the antenna. Changing this isn't too hard as it
is quite possible to rewire the power feed for the antenna to 5 volts.
I do remember the need to draw a certain amount of current from the
antenna circuit in order to avoid a "antenna fault" message.
Supposedly the Trimble board does carrier phase tracking, but
how well this works on something so antique I do not know. Frequency
reference for the receiver is derived from a VXCO that is phased locked
to the disciplined Rb so the entire timing path is coherent.
My original receiver card had the GPS date problem and took some
fiddling to get the epoch right so it would compute the ephermides right
and find satellites, eventually I obtained an upgraded receiver board
with a PIC chip that twiddled the MSBs of the date message and does
display the date correctly.
At the moment my receiver is down as the 24 volt to +5 and +-12
volt DC to DC converter died and I haven't got around to finding a
replacement that fits in the space provided. If someone on the list
has a hanger queen with this board available I'd be interested....
--
Dave Emery N1PRE/AE, die@dieconsulting.com DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in
celebration of what could have been, but wasn't and is not to be now either."