[op25-dev] Success running OP25 with GNURadio 3.7.11

Sean Kealy superstardodge@yahoo.com [op25-dev] op25-dev at yahoogroups.com
Sun May 14 16:24:10 UTC 2017


What should I enter for the p25 frame assembler, I get a flowgraph error for this block
 

    On Wednesday, May 10, 2017 7:50 AM, "Alex alex323 at gmail.com [op25-dev]" <op25-dev at yahoogroups.com> wrote:
 

     [Attachment(s) from Alex included below] 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  #yiv4036891659 #yiv4036891659 -- #yiv4036891659ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv4036891659 #yiv4036891659ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv4036891659 #yiv4036891659ygrp-mkp #yiv4036891659hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv4036891659 #yiv4036891659ygrp-mkp #yiv4036891659ads {margin-bottom:10px;}#yiv4036891659 #yiv4036891659ygrp-mkp .yiv4036891659ad {padding:0 0;}#yiv4036891659 #yiv4036891659ygrp-mkp .yiv4036891659ad p {margin:0;}#yiv4036891659 #yiv4036891659ygrp-mkp .yiv4036891659ad a {color:#0000ff;text-decoration:none;}#yiv4036891659 #yiv4036891659ygrp-sponsor #yiv4036891659ygrp-lc {font-family:Arial;}#yiv4036891659 #yiv4036891659ygrp-sponsor #yiv4036891659ygrp-lc #yiv4036891659hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv4036891659 #yiv4036891659ygrp-sponsor #yiv4036891659ygrp-lc 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