[time-nuts] NTGS50AA Power supply

Bob Camp lists at rtty.us
Sat Feb 9 11:50:40 EST 2013


The most common way to design this gear is with an isolated supply. That eliminates a bunch of odd line fault issues. The easy way to check this is with an ohm meter. If it's isolated (and I'll bet it is) then polarity to ground isn't an issue. Polarity between the supply input pins is always going to matter….

The back of the units I have are labeled "+27V or -53V…". I run mine on a 28 volt supply. 


On Feb 9, 2013, at 11:18 AM, EB4APL <eb4apl at cembreros.jazztel.es> 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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