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, [email protected] 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, [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. _______________________________________________ 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.
