Hi all,

OP25 (specifically scope.py) doesn't seem to work out of the box with
the latest version of GNU Radio, seemingly because it relies on
deprecated components (WX widgets). Today I was able to massage the
code to get it semi-functional with 3.7.11 using my own custom flow
graph, which was reverse engineered from the scope.py application. When
I tune it to a voice channel of a Phase I system I am able to hear
audio, which I consider a success.

The changes I made to the code base are located here[0], and attached
to this email is my flow graph. I hope that this is helpful to people
new to the project.

I do have some questions though:

1. How can this flow graph be optimized? I am not a radio expert by any
means, and while this flow graph works, I don't know *why* it works.
Importantly, the MPSK Receiver block is deprecated and set to be removed
in a future release[1], so I'd like to change it to something more
idiomatic.

2. What do the veriables "beta", "gain_mu", "alpha", "gain_omega",
"if_rate", and "symbol_deviation" mean? How were they chosen? Why do
they work?

--
Alex

[0] https://github.com/centromere/op25
[1] https://github.com/gnuradio/gnuradio/issues/1083