[USRP-users] Fwd: GPSDO not found

Marcus D. Leech mleech at ripnet.com
Thu Dec 4 09:33:02 EST 2014

On 12/03/2014 10:01 PM, Dan Sego via USRP-users wrote:
> ---------- Forwarded message ----------
> From: *Dan Sego* <bubbadoradar at gmail.com <mailto:bubbadoradar at gmail.com>>
> Date: Wed, Dec 3, 2014 at 6:37 PM
> Subject: GPSDO not found
> To: usrp-users at lists.ettus.com <mailto:usrp-users at lists.ettus.com>
> Please disregard last note. When in doubt read (all) the 
> documentation. Ran the eeprom burner (usrp_burn_mb_eeprom) and 
> received a successful result.
> After cycling power I ran uhd_usrp_probe again. Detecting internal 
> GPSDO again returned - No GPSDO found. However under Mboard N200r4 the 
> gpdso field indicates "internal"
> So some consternation remains. Suggestions, please?
> cheers,
> Dan Sego
My recollection is that the GPSDO doesn't start putting out NMEA 
sentences until it has warmed-up from cold start, and it is the NMEA 
sentences that
   the USRP is looking for to confirm the presence of the GPSDO.  So, 
power it up, leave it for 30 minutes, then try to bring up a session 
with it.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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