On 11/05/2023 12:32, [email protected] wrote:
Hi everyone,
I would like to transmit and receive with a sample rate of 280KHz but
when I try it, I get the following messages :
[WARNING] [MULTI_USRP] The hardware does not support the requested TX
sample rate:
Target sample rate: 0.280000 MSps
Actual sample rate: 0.390625 MSps
[WARNING] [MULTI_USRP] The hardware does not support the requested RX
sample rate:
Target sample rate: 0.280000 MSps
Actual sample rate: 0.279330 MSps
So there is a problem specially in Tx side. I have understood that the
*master clock rate must be an integer multiple of the sampling rate*,
but the only clock rate values working with the X310 are 200MHz and
184.32MHz which are too high to be able to use a sampling rate of 280 KHz.
Is there any way to use a sampling rate of 2800 KHz ? I am forced to
use the UHD version 3.15 for other reasons but when I tried the UHD
version 4.1.0 I didn’t notice this issues.
Thank you very much in advance.
The requested sample rate MUST be a whole integer fraction of the master
clock rate, which on X310 is either 200e6 or
184.32e6.
I believe the maximum decimation ratio supported is 512, which means
390625sps for a 200e6 master clock, and 360000sps
for a master clock of 184.32e6.
What is your hardware line-up on the two sides of the X310? Some
daughtercards (at least at UHD 3.15) weren't
as flexible in terms of clocking requirements, so MUST use a master
clock of 200e6.
I honestly have no idea why the TX/RX disagree on the sample-rate
calculation--there's only 1 master clock.
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