[time-nuts] Trimble/Nortel 45000 GPS Locked Reference Oscillatorboard

Erno Peres ernieperes at aol.com
Tue Dec 24 10:20:07 EST 2013


Dave,

my opinion is that this big tree around your GPS antenna causing a  lot of " trouble "
as especially when the tree are wet.......

Rgds Ernie.




-----Original Message-----
From: quartz55 <quartz55 at hughes.net>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Tue, Dec 24, 2013 4:10 pm
Subject: Re: [time-nuts] Trimble/Nortel 45000 GPS Locked Reference Oscillatorboard


That Nortel board you have there looks exactly like the board I got in my Nortel 
TBW50AA GPSTM.  You can find the book on-line, look for "Dual Voltage Global 
ositioning System Timing Module (GPSTM) OEM General Specification".  Yes the 
ower supply is speced from 24 to 48VDC plus or minus.  They don't specify AC, 
ut since the bridge is there it will work. 2.08A warm up and .6A at 36VDC steady 
tate.
I'd like to see some of your LH traces if you don't mind, especially the osc 
race. I don't seem to be able to get my osc trace less than ~400 ppt/div. You 
an see pics of my unit and traces from LH here http://s251.photobucket.com/user/DogTi/library/time?sort=3&page=1
Dave
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