2017-11-24 07:07:23


r00t.cz


My Software

Hardware

Satellites

Misc stuff

Links

Fleet Broadcast Decoder v0.5

Page: SW.FBR - Last Modified : Thu, 03 Sep 09

Fleet Broadcast is a 16 channel 75Bd multiplex transmitted from SATCOM satellites on 250.450/550/650 MHz. Modulation is DBPSK 1200Bd, to receive it you need receiver with 2KHz filter and SSB mode. Channel #0 is used for synchronization, other channels are usually filled with pseudo-random crypted data. Sometimes KG84 messages are transmitted. So far no plaintext was ever seen on Fleet Broadcast...

Fleet broadcast decoder
  • On top there is status line like [S-r-Ki-i-i--iKii]
    This represents state or detected content of channels as:
    • S = SYNC
    • r = reversals (1010101010 pattern)
    • K = KG84
    • i = idle/constant 1 or 0
    • - = unknown
  • Also sync quality (should be 100% all the time with good signal) and increasing frame counter (resets on resync)
  • At bottom there is status log with info about KG84 and program status messages
  • Hotkeys:
    • Q = exits application
    • S = toggles saving of raw bit stream to files
    • +/- = Tune demodulator frequency, demodulator have AFC and will adjust once tuned -/+100Hz or so



Download: fbr.zip (41kb)


All content on this webpage is published for personal use only.
You are using any software downloaded from this page at your own risk. Some software may be illegal to use in your country.


© r00t 2009-2012 (email: r00t@<this domain>)