Minimum amount of data to trigger WX GUI Scope Sink? and Ch 1 vs. Ch2 with Ch 3 vs. Ch 4

GNU Radio
1

Hi,

I am using WX GUI Scope Sink, and I have set the sample rate = 1M, same
as the USRP. It seems that a minimum number of data points are required
before anything appears on the plot - is that correct, and how can it be
adjusted?

Also, I am looking at constellations, using the XY mode to show real and
imaginary. It is possible to have multiple inputs, but is it possible to
view multiple ‘series’ in XY mode?

I seem to be only able to choose Ch X vs Ch Y, e.g. Ch 1 vs. Ch 2 (
Re(in1) vs. Im(in1) ) or Ch 1 vs. Ch 4 (Re(in1) vs. Im(in2)). I would
like to see Ch 1 vs. Ch 2 and Ch 3 vs Ch 4 simultaneously?

Thanks in advance! :slight_smile:

David

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2

The trigger of scope sink is not for XY mode.

If you want to view two complex signal simultaneous, then it seems you
need
two scope sinks.

If you dont see anything, maybe you have a block driving it that doesnt
output anything until some condition is met.

On Wed, Dec 11, 2013 at 10:53 AM, David Halls