[time-nuts] New NTBW50AA
Bob Camp
lists at rtty.us
Sun Sep 8 14:31:54 UTC 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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