[time-nuts] DATUM 9390 Info wanted

Wed Sep 12 10:10:28 EDT 2007

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 at febo.com [mailto:time-nuts-bounces at 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 at 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 at febo.com [mailto:time-nuts-bounces at 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 at 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 at febo.com [mailto:time-nuts-bounces at 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 at 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 at febo.com [mailto:time-nuts-bounces at 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 at 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 at febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.