[time-nuts] New NTBW50AA

[GandalfG8 at aol.com]

Whoops, you're quite right !!
 
The figures I quoted were the maximum taken straight from the manual,  as I 
happened to have it open anyway, and whilst I did think the startup current 
 seemed rather high didn't stop to check my own notes as I was in a bit of 
a  rush, that'll teach me:-)
 
Checking back now, what I actually measured with a 48  Volt supply was 
305mA from a cold start and 147mA warmed up and  running, which equates to 
approximately 15 and 7 Watts respectively.
 
Regards
 
Nigel
GM8PZR
 
 
In a message dated 08/09/2013 13:48:48 GMT Daylight Time, lists at rtty.us  
writes:

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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