Decoding Digital Voice with OP25 #SDR #hamr

A quick demonstration of OP25 vs a Uniden BCD996T on a weak signal P25 Phase I LSM trunking system (Morris County, NJ).

Both radios feed off the same “Scantenna” antenna, multiplexed by a common CATV drop amplifier. Note the poor constellation in OP25. Using an RTL-SDR.org dongle with TXCO.

OP25 does a fair job of decoding while the 996T doesn’t even hear the control channel.

For years this system was unmonitorable due to terrain and distance. Not anymore!

Read more here at the Phasenoise blog and check out the OP25 project’s tasks list here.

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