[time-nuts] Trimble/Nortel NTGS50AA GPSDO not start

Tom Knox actast at hotmail.com
Tue Jun 12 00:19:36 UTC 2012


Check the converter specs, some offer a optional on/off pin when powered. The apply clean power directly to the the converter input.

Thomas Knox



> Date: Tue, 12 Jun 2012 02:01:04 +0200
> From: eb4apl at cembreros.jazztel.es
> To: time-nuts at febo.com
> Subject: [time-nuts] Trimble/Nortel NTGS50AA GPSDO not start
> 
> Hi,
> 
> I received one of those boards from the usual Chinese supplier.  I tried 
> to power it up according to the specs but the DC/DC converter doesn't start.
> Tracing the power path, I find that after protective diodes and fuses, 
> the -48 V line is interrupted by a power MOSFET and the question is:  is 
> it necessary to make any other connections, such as strapping the 
> mounting holes to a chassis, in order to make it start? Or maybe is my 
> unit faulty?
> 
> TIA for your help,
> Ignacio EB4APL
> 
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