World's cheapest P25 receiver w/ decryption: GNU Radio + OP25 + $20 RTL2832 DVB-T Dongle @balint256

Uploaded April 2012 | Updated September 2026, 2 weeks ago

wiki.spench.net/wiki/gr-baz#rtl_source_c | Follow me @spenchdotnet twitter.com/spenchdotnet
OP25: op25.osmocom.org {{{ Learn more about security flaws in the P25 standard from their white-hat research (e.g. key recovery, remote inhibit...)

I will submit the OP25 Decoder GRC block, DES-OFB decryption support and other enhancements to the OP25 project soon!

The 'Message Callback' block is part of gr-baz, and allows messages sent by blocks to trigger functions (variable 'set' updates) in the Python code generated by GRC. In this case it allows the FSK4 demodulator to fine-tune the frequency offset of its input.

$Worlds cheapest P25 receiver w/ decryption: GNU Radio + OP25 + $20 RTL2832 DVB-T Dongle http://wiki.spench.net/wiki/gr-baz#rtl_source_c | Follow me @spenchdotnet http://twitter.com/spenchdotnet OP25: http://op25.osmocom.org/ {{{ Learn more about security flaws in the P25 standard from their white-hat research (e.g. key recovery, remote inhibit...) I will submit the OP25 Decoder GRC block, DES-OFB decryption support and other enhancements to the OP25 project soon! The Message Callback block is part of gr-baz, and allows messages sent by blocks to trigger functions (variable set updates) in the Python code generated by GRC. In this case it allows the FSK4 demodulator to fine-tune the frequency offset of its input.$

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