Thursday, 23 February 2017
Decoding TETRA on Windows!
To capture the signals I was using an RTL SDR which is a very cheap device that allows you to tune to a wide range of frequencies. You can find one to buy at this link:
http://smarturl.it/rtlsdr (Redirecting link for your local area)
Video by cURLy bOi who wrote the wintelive software: https://youtu.be/OTKn1UwYMBI
The audio on this TETRA system is often not very good. I'm not sure of the exact reason for this but it sounds like they have the mic gain set to a fixed value rather than using AGC, so their voices are often way too loud or way too quiet. I don't know why they would do this. Maybe the radios they use aren't able to do AGC, in which case they must not be very good radios. I had to adjust the audio gain in this clip to reduce the volume of some radio users and increase the volume of others.
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