[USRP-users] Tune Request for B210

Marcus Müller marcus.mueller at ettus.com
Mon Jul 3 08:52:43 EDT 2017

You can do this with uhd.tune_request_t in python, if you're writing GNU
Radio Python code, but otherwise, yes, that should be part of your C++
UHD program; see the examples that ship with UHD [1] under host/examples.

Anyway, as I tried to illustrate before, I don't think you're chasing
the right problem, but I might still be misunderstanding you. Could you
maybe explain why you think setting the DSP frequency to zero solves
your problem, and what exactly that problem is, and why it is a problem?

Best regards,


[1] https://github.com/EttusResearch/uhd

On 07/03/2017 01:01 PM, altuğ kaya via USRP-users wrote:
> Hello everyone,
> I would like to tune the DDC Chain of my B210. When I search the net
> and ask to this forum, I learned that I have to equate the sampling
> rate to the master clock in order to by-pass the filters and I have to
> eliminate the CORDIC in order to add/subtract 0 Degrees from IQ data.
> Changing the sampling rate is rather easy, as it is done from cmd by
> entering an additional parameter. However, I did not understand how to
> manipulate CORDIC.
> In the MailArchive of USRP[1], I found the explanation below:
>     A tune request similar to this will disable the CORDIC:
>     uhd::tune_request_t tune_req(target_frequency_in_hz, desired_lo_offset);
>     tune_req.dsp_freq_policy = tune_request_t::POLICY_MANUAL;
>     tune_req.dsp_freq = 0.0;
> But, I really cannot figure out where to put these. Should I write a
> C++ code and include tune_request.hpp?
> I am looking forward to your reply,
> Altug
> [1]https://www.mail-archive.com/usrp-users@lists.ettus.com/msg01105.html
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