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, [email protected] 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, [email protected] 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, > [email protected] 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 > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
