[time-nuts] NTGS50AA Power supply

[Bob Camp]

Hi

I've never bothered to dig into the pps issues on the box. I have just been using the RF output.

Bob

On Feb 9, 2013, at 8:22 PM, EB4APL <eb4apl at cembreros.jazztel.es> wrote:

> Bob,
> 
> Thank you for your response. I already have it working with a 48 V floating supply, as per the vendor info (Bob Mokia, fluke.l), but I found in the referred documentation that maybe I could use a 24 V power supply if I need it.
> I bought only the PCB, not the original enclosure (too heavy) so I don't have any power input label.  I removed the PCB from my box, traced the circuit somewhat and I realized that this is not a dual voltage unit, but a 48 V one.  The 24 V units has the input polarity reversed on the same connector pins.
> Have you found in your units any means of getting 1 PPS instead the current 1/2 PPS?
> 
> Best regards,
> Ignacio EB4APL
> 
> 
> On 09/02/2013 17:50, Bob Camp wrote:
>> Hi
>> 
>> 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.
>> 
>> Bob
>> 
>> 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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