[time-nuts] Datum 9390-6000 Problem

[Brooke Clarke]

Hi Mitch:

It turns out that the Trimble first generation GPS receivers require a high 
gain antenna or an amplifier in the feed line to work properly.  So one of the 
antennas that works for them may be what's needed for your receiver.  See:
http://www.prc68.com/I/Trimpack.shtml#Ant

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam

Mitchell Janoff wrote:
> 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.