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We can send those to ALSA with a named pipe and aplay:. The GQRX window looks like this: There are some guides out there on how to decode these with an RTL-SDR, but they’re all highly Windows-centric and look like a pain in the butt, to be honest. The -f1 -mc options to dsd indicate what signal should be expected; this would vary if listening to something other than LAPD. Commandline-only listening no GQRX Once we find a channel we like, using GQRX to interactively tune the radio as described above , we can run the whole pipeline with one command possibly zsh-only: We’re clearly listening to an active transmission:

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Same as before, except we tweak the Makefile to find and use the library we just built, and to use the statically-linked version so that we don’t need to mess with RPATHs. There are multiple digital-sounding channels and multiple types of encoding are present sound different.

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Now one can go back, and fix stuff; stuff mbflib inaccurate tuning. We’re clearly listening to an active transmission: The GQRX window looks like this: Decoding the stream Now we can think about listening in. You can play around to find a signal that dsd knows how to decode.

mbelib

Once we find a channel we like, using GQRX to interactively tune the radio as described abovewe can run the whole pipeline with one command possibly zsh-only:. The signal is intermittent because the transmitter is only active when there’s data to send, i.

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We check out the code, roll bakc to the latest tag and build: Mbeljb are some guides out there on how to decode these with an RTL-SDR, but they’re all highly Windows-centric and look like a pain in the butt, to be honest. We built mbelibnow we can build dsd. We still can’t hear the results because dsd doesn’t write mbelob anywhere useful.

mbelib

We can send those to ALSA with a named pipe and aplay:. First we get and build mbeliba library it uses. That’s a holdover from some ancient system that ALSA doesn’t provide by default, and I want to avoid it if possible.

We check out the code, roll bakc to the latest tag and build:. I wanted to play with an software-defined radio for a while now.

Index of /macports/distfiles/mbelib/

The -f1 -mc options to dsd indicate what signal should be expected; this would vary if listening to something other than LAPD. The issue I ran into was that we’re tuning into a relatively narrow-band signal, so the tuning is sensitive, and small tuning errors make you miss the signal you want entirely. There is a tool for decoding P25, dsd ; it’s not in Debian, so we have to build it. There are several basic tools one can use for this.

Install mbelib on Mac OSX

It’d be nice to automatically tune into valid channels, of better yet to follow the trunking signals, but that’s more work than I’m willing to put into this. The text is in the public domain. So this setup works for me.

You can roughly tune in simply by looking at the plot, and you can fine-tune by listening to the demodulated signal, trying to find the characteristic digital buzz and no static. We mblib make a named pipe, or better yet, we can pass the data to dsd on standard input:.

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Note that since we’re now looking for channels empirically, we compensate for tuning inaccuracies, but the LAPD frequency list becomes useless, and we don’t even know what specifically we’re listening to. So they’re using P25 -encoded digital signals, which are unencrypted, apparently.

This is perfect for this application, and I turn on that GQRX mode by pressing the appropriate button bottom of the screenshot; two computers are pictured. Commandline-only listening no GQRX Once we find a channel we like, using GQRX to interactively tune the radio as described abovewe can run the whole pipeline with one command possibly zsh-only: I bought one, and looked into using it as a police scanner.

This post is a set of notes on getting this working on a Debian box. We can make a named pipe, or better yet, we can pass the data to dsd on standard input: Suprisingly to me, there’s quite a bit of information out there about the protocols and frequencies used by LAPD: I didn’t push on this very hard, so this could very well be my fault. Linking C static library libmbe.