[time-nuts] New NTBW50AA
GandalfG8 at aol.com
GandalfG8 at aol.com
Sun Sep 8 04:08:44 EDT 2013
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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