On 05/14/2014 11:44 AM, Tom Tsou wrote:
On Wed, May 14, 2014 at 6:16 AM, Martin Braun<martin.br...@ettus.com> 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
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