[time-nuts] New NTBW50AA

Bob Camp lists at rtty.us
Sun Sep 8 10:31:54 EDT 2013


Hi

That sounds about right. Current would double at 24 volts / power would be the same. A cheap 50W power supply at either voltage would run a *lot* of GPSDO's. 

Looks like a 

http://www.digikey.com/product-detail/en/LS50-24/285-1820-ND/1918831

for $21.64 would do pretty well.

Bob


On Sep 8, 2013, at 9:32 AM, GandalfG8 at aol.com wrote:

> 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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