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Re: [Discuss-gnuradio] B200 clock calibration
From: |
Tom Tsou |
Subject: |
Re: [Discuss-gnuradio] B200 clock calibration |
Date: |
Wed, 14 May 2014 11:44:32 -0400 |
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