Re: [Discuss-gnuradio] Retune Request Time

[Derek Kozel]

Hi Rich,

You can create and pass a tune_request_t into the set frequency call of a USRP object. This gives you control of how it tunes. By default it does not optimize for speed to my knowledge.

http://files.ettus.com/manual/structuhd_1_1tune__request__t.html

Depending on what USRP you are using there are self calibration thresholds which will cause a retune to incur a delay when tuning outside of a certain range. On the B200 for instance this range is 100MHz.

Regards,

Derek

On Mon, Jun 13, 2016 at 3:05 PM, Richard Bell <address@hidden> wrote:

I am using set_center_freq(center_freq) in my python script to retune my USRP to various center frequencies. Does this command use the smartest retune technique to get to the new frequency?

For example, if I want to retune from 900.000 MHz to 900.001 MHz ( a 1 kHz change), will it use DSP tuning instead of RF tuning for speed? Is there a way to control this through python?

In my testing, it seems the retune time is constant whether I make a 1 GHz hop, a 3 MHz hop or a 1 kHz hop, which makes me think I'm overlooking something.

Thanks,

Rich

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