Hi all! Thank you for contributing to gnuradio and providing new users like me with help.
I have read and worked through some of the guided tutorials. However I come to a point now where it seems that own Python code has to be written. Unfortunately I am more like a C++ guy and would appreciate it if someone could give me some advice. Let us please take a look at the QPSK transmitter example of tutorial 6 [1]. It gives a nice example and you can play around with the parameters of the PSK Mod block in gnuradio-companion. What we would like to do is to change the roll-off factor during runtime using a Qt GUI Range element (i.e. a slider control) to demonstrate its effect. As the associated parameter is not underlined in the properties dialogue I wonder how this can be done during runtime. When looking at the generated sourcecode it can be seen that an instance of `digital.psk.psk_mod` is created in `__init__` method and stored in element `self.digital_psk_mod_0`. I tried to add code in the slider's callback function `def set_excess_bw_slider(self, excess_bw_slider)`. But it does not show changes in constellation and spectrum plot though printing debug messages like `RRC roll-off factor: 0.15` on the command line. I tried: - to access the excess_bw property of the digital.psk.psk_mod directly to be modified - to create a new instance of digital.psk.psk_mod in the callback function and overwriting the original one (in C++ this would be bad practice probably leading to memory leaks and might be the same for Python) I did not really find the documentation of the digital.psk.psk_mod class, except at [2]. And in the sources themselves [3]. A short hint where to take a closer look would be great! Thank you in advance Matthias [1] https://raw.githubusercontent.com/gnuradio/gr-tutorial/master/examples/tutorial6/gr-tutorial-qpsk-tx.grc [2] http://www.reynwar.net/gnuradio/sphinx/digital/blocks.html [3] http://gnuradio.org/redmine/projects/gnuradio/repository/revisions/master/entry/gr-digital/python/digital/psk.py _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
