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Today's Topics:
1. Time/Clock source and GPSDO (John Shields)
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Message: 1
Date: Sun, 1 Apr 2012 12:21:29 +1200
From: "John Shields" <[email protected]>
To: "usrp-users" <[email protected]>
Subject: [USRP-users] Time/Clock source and GPSDO
Message-ID: <68E1862BD7764A36ADF7A76E11896E4E@FIFE>
Content-Type: text/plain; charset="iso-8859-1"
(Ubuntu 10.04, UHD_003.004.000-1gea19de0b, GNURadio v3.5.2.1-61-gfc115e6a)
I have a GPSDO equipped N210 Rev 4 and when I do a uhd_usrp_probe I get:
gpsdo: internal
....
Time Sources: none, external,_external_,mimo
Clock Sources: internal, external, mimo
Sensors: gps_gpgga, .... gps_time, gps_locked, mimo_locked, ref_locked
but when I go to populate options in GRC, I get
Clock Source: Default, Internal, External, MIMO cable, O/B GPSDO
Time Source: Default, External, MIMO cable, O/B GPSDO
For the paired/ganged USRP, which is connected to the master through a
MIMO-cable, I put Clock and Time - MIMO but for the first it baulks at init
time with set_clock_source("gpsdo",0).
Back when I got the unit, I did the 'patch' to enable getting time from GPSDO
in addition to PPS.
Why would I not put Clock and Time source for master as "O/B
GPSDO" and why doesn't it work?
Kind Regards,
John
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