[USRP-users] GPSDO Support

Marcus D. Leech mleech at ripnet.com
Sun Jun 3 12:36:47 EDT 2012

> Hi,
> Via UHD.dll or flipping switches? It looks like I'll be buying one 
> anyway, the phase noise spec is very good.
> Searching the UHD.dl source code I see this which indicates that it's 
> used automagically:
> "By default, if a GPSDO is detected at startup, the USRP will be 
> configured to use it as a frequency and time reference. The internal 
> VITA timestamp will be initialized to the GPS time, and the internal 
> oscillator will be phase-locked to the 10MHz GPSDO reference. If the 
> GPSDO is not locked to satellites, the VITA time will not be initialized."
That is only, as far as I know, for the "in skin" internal GPSDO.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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