[time-nuts] New NTBW50AA

Bob Camp lists at rtty.us
Sun Sep 8 08:48:05 EDT 2013


Hi

The power swing as the OCXO warms up is a bit less than 10 watts. 

Bob

On Sep 8, 2013, at 4:08 AM, GandalfG8 at aol.com wrote:

> Hi Dave,
> 
> Just taking a short break from a major data recovery exercise to add a  
> couple of comments to the replies you've already received.
> 
> The part number for the DC to DC convertor should be written on the side of 
> it, although it might be awkward to see if facing the inside of the case.
> On my uncased Ebay boards from fluke.l it's visible as being a Datel  
> TBP-5/5-12/1-Q48 so I suspect yours will be very similar. Google that number to  
> bring up a datasheet.
> If yours is the same it will handle an input range of 18 to 72 volts, 19.5  
> via the diode block would have been low but 30 is fine and 48 would be 
> better,  as has already been noted the convertor input current is based on the 
> total  output power, which is pretty much independant of input voltage, so 
> the higher  the input voltage the lower the input current.
> 
> The generic manual set for the Trimble Nortel boards is in Didier's manuals 
> collection....
> _http://www.ko4bb.com/manuals/index.php?dir=05%29_GPS_Timing/Nortel_GPS_ 
> (http://www.ko4bb.com/manuals/index.php?dir=05)_GPS_Timing/Nortel_GPS) 
> 
> The Nortel GPSTM General Specification document will give more information  
> on the current requirements but you should allow for approximately 75 watts 
> input power during oscillator warm up and 22 Watts when settled.
> 
> The longer the board is left up and running the better, permanently powered 
> is best for long term performance, and especially the first time round  
> whilst it sorts out its new location.
> The location is stored automatically to the board, either by the board  
> itself or under instruction from Lady Heather not sure which, but as your 
> posted  LH plot shows your position has now been stored. With the position stored 
> I've  found the time for acquisition and oscillator locking can be as 
> little as 10  minutes.
> 
> Further to Mark's comment about the backplane connector, the manual also  
> shows the pinout data for that and I don't see any reference to 1PPS.
> 
> Regards
> 
> Nigel
> GM8PZR
> 
> 
> 
> 
> In a message dated 08/09/2013 00:27:36 GMT Daylight Time,  
> quartz55 at hughes.net writes:
> 
> Thanks  Mark, yeah, I think I'm getting the hang of this thing.  The ADEV 
> is down  to 1.032e-008 by this point.
> 
> I think the red light was on because it  was going out of lock, it couldn't 
> find the satellites until I did a  survey.  Then things started coming into 
> perspective when it found my  position.  At one point the osc was listed as 
> bad.  I just turned it  off and started again and it seems fine now.
> 
> Nothing seems even warm on  the board with 30VDC going into it.  That brick 
> I had, I couldn't get the  voltage out of it, so I canned that one.  I 
> think I can find a smaller  supply than I've got though, this one is an old 10A 
> 12V linear regulated  supply that the regulator went out in.
> 
> I haven't had this much fun  since the pigs ate my little  brother.
> 
> Dave
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