[USRP-users] B210 RF DC Offset Calibration Failure

Perelman, Nathan nperelman at LGSInnovations.com
Mon Dec 1 16:58:53 EST 2014


I'm seeing this error attempting to use a B210 with a master clock rate of
61.44 MHz. This is with UHD 3.8.0. I've been just trying to test it out with
the benchmark_rate application, but this is what happens:

 

$ ./benchmark_rate --rx_rate 61.44e6 --channels 0 --args
"master_clock_rate=61.44e6" --rx_cpu=sc16

linux; GNU C++ version 4.8.3 20140624 (Red Hat 4.8.3-1); Boost_105500;
UHD_003.008.000-0-unknown

 

 

Creating the usrp device with: master_clock_rate=61.44e6...

-- Operating over USB 3.

-- Detecting internal GPSDO.... Found an internal GPSDO

-- Initialize CODEC control...

-- Initialize Radio control...

-- Performing register loopback test... pass

-- Performing register loopback test... pass

-- Performing CODEC loopback test... pass

-- Performing CODEC loopback test... pass

-- Asking for clock rate 61.440000 MHz

 

UHD Warning:

    The requested clock rate 61.440000 MHz may cause slow configuration.

    The driver recommends a master clock rate less than 56.000000 MHz.

Error: RuntimeError: [ad9361_device_t] RF DC Offset Calibration Failure

 

 

I get the same error for other rates I've tried in excess of 56 MHz. Any
idea what causes this error and what I could do to resolve it? Thanks.

-Nathan

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