Re: [Discuss-gnuradio] B200 clock calibration

[Tom Tsou]

On Wed, May 14, 2014 at 6:16 AM, Martin Braun <address@hidden> wrote:
> On 14.05.2014 12:12, Robert Light wrote:
>>   UHD Warning:
>>   The hardware does not support the requested RX sample rate:
>>   Target sample rate: 0.270833 MSps
>>   Actual sample rate: 0.271186 MSps
>
> Robert,
>
> as long as you see this warning, you'll get offsets. I don't know where or
> how kal sets up the master clock, but you should put in a
> master_clock_rate=13e6 somewhere in there.

In this particular case, it's actually not very important. Kal is
basically performing a tone search and the sample rate used for
internal calculations is the rate returned by UHD. The sample rate can
be almost any value.

2 kHz offset is within tolerance for 1900 MHz. Locking to a stable 10
MHz reference, generally an OCXO or GPSDO, is the recommended
approach.

  -TT