[time-nuts] Datum 9390-6000 Problem

Mike Feher mfeher at eozinc.com
Sun Nov 11 14:05:01 UTC 2007


BTW, I just placed another of the 9390s on line last night, using the same
output of the amp/splitter as the one that used to go to the 9390 that died,
and, this morning it is locked and showing both the right time and the right
day of the year. This one came for less than $100 with shipping from ebay.
It was sold as is, had a special connector on the rear for AC and another
for DC, so, was sold as is. After finding a connector and wiring it up, it
did not work. A little trouble shooting revealed a defective on/off switch.
This one also has a Rubidium inside. Date code of most parts is 1994. This
one has about 25 or so BNCs on the rear, so, just about every type of output
is available. Not a bad investment. Here is the ebay URL for it in case
anyone is interested. Regards - Mike

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320148228587
  

 
 
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 Mike Feher
Sent: Saturday, November 10, 2007 11:08 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Datum 9390-6000 Problem

); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+mfeher=eozinc.com at febo.com RETRY

Mitch -

I have about 6 of the 9390 series receivers. Most with Rubidiums and some
with OCXOs. I had 3 of them running simultaneously with a Z3801A. They were
on an HP antenna running through a 4 way splitter that is widely available
on ebay. Two of the three locked properly and showed the proper time,
however, they had the wrong, but same, day of year. I could live with that.
The other one showed the correct day of year and time. About a month ago the
one that showed the correct day of year totally quit lock, and I believe it
also shows a low signal level, as the system check was OK. Too many other
projects to play with it yet. 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 Mitchell Janoff
Sent: Saturday, November 10, 2007 9:59 AM
To: time-nuts at febo.com
Subject: [time-nuts] Datum 9390-6000 Problem

); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+mfeher=eozinc.com at febo.com RETRY

Greetings all. I have a Datum 9390-6000 with the Rubidium frequency standard
inside that has been working fine for the past year or so. It requires a
high gain antenna and I'm using a Symmetricom 58532A L1 antenna. With this
antenna I get a "System Check OK" message on the screen. With any other of
my GPS antennas I get a "low signal level" message. I have six other GPS
units operating with various antennas that all work fine. While I don't get
any error messages on the 9390, the unit no longer locks onto the GPS. If I
look at the satellites, the display shows zero for the signal strengths for
each satellite that is trying to track.

I'm wondering if this is an antenna problem vs. a problem with the 9390 and
is there someway to tell. I don't see anyway to do advanced diagnostics on
this unit, and since the GPS receiver is a propriety unit, I can't
substitute it for another model.

Is there a recommended antenna that works best with this unit? Since the
repair on the 9390 is quite expensive, I'm wondering if there is another way
around this, possibly trying a better antenna.

Thanks for your help.

Mitch.



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