Re: [Discuss-gnuradio] Dynamically changing bandwidth of QT GUI Frequency Sink

[Derek Kozel]

You could put a resampling block in front of the QT GUI source or add on to the message handling to support setting the X and Y axis limits. I think that would be a useful addition, the Y axis limits already have callbacks exposed to GRC but not via messages.

Regards,

Derek

On Tue, Jul 31, 2018 at 10:56 AM, Müller, Marcus (CEL) <address@hidden> wrote:

Hi Jason,
just to be sure to understand what you need:
Do you mean "zoom in x-axis"?
(because technically, the bandwidth of that display is always Nyquist,
i.e. defined by the sampling rate)

Best regards,
Marcus

On Mon, 2018-07-30 at 16:57 -0400, Jason Hein wrote:
> I have a GNU radio flow graph with a custom data source and I'd like to be able to change the bandwidth displayed on the QT GUI Frequency Sink block dynamically.  Is there a way to do this programmatically?  The QT GUI Frequency Sink block has a message port for programmatic changes to frequency, but I don't see an equivalent means for changing bandwidth.  Is there a way for an OOT block to get a reference to another block to call a public member function?

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