Re: [Discuss-gnuradio] B200 clock calibration

[Marcus D. Leech]

On 05/14/2014 11:44 AM, Tom Tsou wrote:
> 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
>
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The on-board clock on the B200 is good to about 2PPM, so 2kHz in 1900Mhz 
is just about right.



--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org