[op25-dev] Success running OP25 with GNURadio 3.7.11 [2 Attachments]
Alex email@example.com [op25-dev]
op25-dev at yahoogroups.com
Wed May 10 14:49:43 UTC 2017
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, 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, so I'd like to change it to something more
2. What do the veriables "beta", "gain_mu", "alpha", "gain_omega",
"if_rate", and "symbol_deviation" mean? How were they chosen? Why do
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