Re: [Discuss-gnuradio] Trunking

[Frank Brickle]

> Has anyone thought about what might be required to decode 
trunking
> information and perhaps record all trunks for later
> playback/synchronization?


In the most general cases, you need the capability to
continuously sample about 6 MHz of bandwidth, then baseband
32 channels or so from that stream. That's an awful lot of
data, so you'd want to downcovert, demodulate, and bitsync
the digital channels on the fly, and save only the bits and
computed timestamps from active channels. Analog channel
activity you're sort of stuck with, although you might
resort to compressing them somehow.

There are further savings possible. If you've identified the
control channels, you can decode them and save the control
messages, and pitch the control channel bits as well. But
it's hardly worth it. The cutdown from PCM to bits is
enormous already.

Frank