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Re: [Discuss-gnuradio] Tune UHD - as fast as possible

From: Andrew Davis
Subject: Re: [Discuss-gnuradio] Tune UHD - as fast as possible
Date: Thu, 9 Feb 2012 16:41:46 -0500

self.uhd_usrp_sink_0.set_center_freq(self.freq, 0) will take forever, the whole front end has to re-settle. How far are you moving the center frequency? If it's less than 50MHz you could change the sin signal frequency. You could even hook up a Frequency modulator and change the frequency continually and with absolutely no delay.

On Thu, Feb 9, 2012 at 7:02 AM, Marius Ciepluch <address@hidden> wrote:

I have put a Flow-Graph together, which is quite simple:
Sine Signal -> USRP2 UHD

Now I want to change the center-frequency as fast as possible.

My initial idea was a while True loop and to issue the
self.uhd_usrp_sink_0.set_center_freq(self.freq, 0) command from Python.
This does not work. It remains at the initial frequency.

Do you use the Function Probe block in GRC? Or is there any other way to
make it tune without ending the Flow-Graph?


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