[time-nuts] DATUM 9390 Info wanted

Rob Kimberley rk at timing-consultants.com
Wed Sep 12 07:01:22 EDT 2007


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




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