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

[EB4APL]

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