[time-nuts] Datum 9390-6000 Problem

[Rob Kimberley]

Hi Mitch,

What cable are you using? Units used to ship (when I was selling them ) with
the Trimble Bullet II antenna. If your cable is dropping more than 30-35 dB
at 1575MHz then you will have problems. You might want to check your cable
and connections, especially if the antenna is outside. 
Let me know how you get on.

Rob K (in UK)
  

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Mitchell Janoff
Sent: 10 November 2007 14:59
To: time-nuts at febo.com
Subject: [time-nuts] Datum 9390-6000 Problem

); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+rk=timing-consultants.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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