[USRP-users] GPSDO Support

Simon HB9DRV simon at hb9drv.ch
Sun Jun 3 17:39:19 EDT 2012

Hi Marcus,


Thanks - it's the internal GPSDO I'll be using. The oscillator phase noise
is very good.


Simon Brown, HB9DRV
 <http://dit-dit-dit.com/> http://dit-dit-dit.com


You are standing at the end of a road before a small brick building. Around
you is a forest.

A small stream flows out of the building and down a gully. The sunspot count
is 285.


From: Marcus D. Leech [mailto:mleech at ripnet.com] 
Sent: 03 June 2012 18:37
To: Simon HB9DRV
Cc: usrp-users at lists.ettus.com
Subject: Re: [USRP-users] GPSDO Support




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


"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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