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

Brian Lloyd brian at lloyd.com
Tue Dec 24 15:33:41 UTC 2013


On Tue, Dec 24, 2013 at 9:06 AM, quartz55 <quartz55 at hughes.net> wrote:

> That Nortel board you have there looks exactly like the board I got in my
> Nortel NTBW50AA GPSTM.  You can find the book on-line, look for "Dual
> Voltage Global Positioning System Timing Module (GPSTM) OEM General
> Specification".  Yes the power supply is speced from 24 to 48VDC plus or
> minus.  They don't specify AC, but since the bridge is there it will work.
> 2.08A warm up and .6A at 36VDC steady state.
>

Just because it has a bridge to allow connection of floating +24VDC or
-48VDC doesn't mean it is a good idea to apply AC. The input filter caps
may not be designed to handle the ensuing ripple current. I would tread
lightly in this area.

-- 
Brian Lloyd, WB6RQN/J79BPL
706 Flightline Drive
Spring Branch, TX 78070
brian at lloyd.com
+1.916.877.5067



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