[time-nuts] NTGS50AA Power supply
EB4APL
eb4apl at cembreros.jazztel.es
Sun Feb 10 01:08:17 UTC 2013
Nate,
I have it already connected to a 48 V supply according to the vendor
instructions (fluke.l is a vendor with technical knowledge)and now I
removed the PCB from the case that I furnished and found that my unit
doesn´t have such bridge. Instead it have a quite elaborate reversal
power protection (a series diode, two fuses and a pair of back connected
diodes which will blow the fuses if the power is reversed and the first
diode fails shorted) so I think that there are dual supply models
(according to my documentation) and single supply ones, as my unit
appears to be.
Thank you for the suggestion to change the 1/2PPS to 1PPS by software,
I'll try it.
Regards,
Ignacio EB4APL
El 09/02/2013 17:54, Nathaniel Bezanson wrote:
> Open it up, you'll find a bridge rectifier as the first component on the incoming power.
> It's actually much easier to solder straight to the pins of that component, rather than trying to bodge something together that would poke into the backplane connector. :)
> I know there's a TSIP command for *other* units to change their PPS into PP2S (even second), so try throwing 8E-4E at this unit and see if you can change it the other way. Haven't had a chance to try it on the local one.
> -Nate-
> EB4APL wrote:
>> Hello,
>>
>> According to a Nortel specification document (Dual Voltage Global
>> Positioning System Timing Module (GPSTM) OEM General Specification
>> Dataset Name: GSBW50AA), this GPSDO is dual voltage and can be powered
>> either from -48 V or + 24 V systems. Mine is working from a 48 V power
>> supply but I´m afraid to test it at 24 V because the polarity should be
>> reversed and if my assumption is not true I can damage the unit.
>> Do you know if these units are dual voltage or my documentation refers
>> to other model?. Has anybody operated it at 24 V?.
>> Another question, is there any internal 1PPS signal available?
>> Of course, my unit is of ebay - China origin.
>>
>> Regards,
>> Ignacio EB4APL
>> _______________________________________________
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