On 06/05/2019 07:12 PM, Dario Fertonani wrote:
Thank you Marcus. I should have mentioned that I tried removing that line, with no success. With non-zero dsp_freq, the power spectrum looks OK but the (coherent) signal quality is terrible.
OK, that's a different level of problem.
You're trying to maintain coherence across more than one B210?
On Wed, Jun 5, 2019 at 2:25 PM Marcus D. Leech via USRP-users <[email protected] <mailto:[email protected]>> wrote:On 06/05/2019 05:20 PM, Dario Fertonani via USRP-users wrote:I'm trying to move the "DC offset" out of the main spectrum by using the dsp_freq field in uhd::tune_request_t. This doesn't seem to work on B210, meaning that the following code functions properly with DcOffset_Hz=0 but not, for example, with DcOffset_Hz=10e6. In all these tests the master clock rate is large enough to fit DcOffset_Hz and the spectrum of interest easily. Anything obviously wrong? Thanks, Dario uhd::tune_request_t uhdTuneRequest( const double &CarrierFreq_Hz , const double &DcOffset_Hz ) { uhd::tune_request_t tuneRequest( CarrierFreq_Hz - DcOffset_Hz ); tuneRequest.args = uhd::device_addr_t( "mode_n=integer" ); tuneRequest.dsp_freq_policy = uhd::tune_request_t::POLICY_MANUAL; tuneRequest.dsp_freq = DcOffset_Hz; return tuneRequest; }You shouldn't need to use POLICY_MANUAL at all, since the tune_request_t supports offset-tuning directly: https://files.ettus.com/manual/structuhd_1_1tune__request__t.html _______________________________________________ USRP-users mailing list [email protected] <mailto:[email protected]> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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