Re: [Discuss-gnuradio] USRP2 reference clock

[Marcus Müller]

Hi Nils,

So, could you share your flow graph, or a sketch of it?

Especially (asked you on SO, too): Do you use one uhd_usrp_source, or two? And: how do you tell the source(s) which USRP to use?

To answer the easy-to-answer questions right now:

Is it possible to set the master clock at the USRP2 or what
could been the reason?

No, USRP2 has a fixed 100MHz MCR. My suspicion is that you're actually setting the rate of the X300, or a side effect of trying to set the rate of the USRP2 helps you here; hence my question for the overall approach.

Best regards,
Marcus

On 13.04.2016 09:26, Nils Hollmach wrote:

Dear Sir or Madam,

At present I work with 2 different USRPs.
One of this is the USRP2 and the another one a newer device is the X300.
This devices communicate each about QPSK and a test algorithm.
For the USRP2 I use the reference input and use reference clock output from
the x300 device to compensate frequency shift.
If I use the command
self.uhd_usrp_source.set_clock_source("external", uhd.ALL_MBOARDS)
, then data communication didn't work.
But If I set the master clock of the USRP2 to 200Mhz with
self.uhd_usrp_source.set_clock_rate(200e6, uhd.ALL_MBOARDS)
, then the communication works.
Is it possible to set the master clock at the USRP2 or what
could been the reason?

 

best regards

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