Using your sample poc1200.raw im getting: Is it normaly that my set frequency (172.680 MHz) Tuned to 172944600 Hz? Sometimes i can read one part of a word, but then it says CORRUPT… POCSAG1200: Address: CORRUPT Function: CORRUPT Using device 0: Terratec Cinergy T Stick RC (Rev.3) Multimon-ng (C) 1996/1997 by Tom Sailer HB9JNX/AE4WAĪvailable demodulators: POCSAG512 POCSAG1200 POCSAG2400 EAS UFSK1200 CLIPFSK AFSK1200 AFSK2400 AFSK2400_2 AFSK2400_3 HAPN4800 FSK9600 DTMF ZVEI1 ZVEI2 ZVEI3 DZVEI PZVEI EEA EIA CCIR MORSE_CW DUMPCSV SCOPEĮnabled demodulators: POCSAG512 POCSAG1200 POCSAG2400 POCSAG512 POCSAG1200 POCSAG2400 EAS UFSK1200 CLIPFSK AFSK1200 AFSK2400 AFSK2400_2 AFSK2400_3 HAPN4800 FSK9600 DTMF ZVEI1 ZVEI2 ZVEI3 DZVEI PZVEI EEA EIA CCIR MORSE_CW DUMPCSV SCOPE
But multimon says ~ $ rtl_fm -N -o 4 -A lut -s 22050 -C -f 172.680M – | multimon-ng -t raw -a POCSAG512 -a POCSAG1200 -a POCSAG2400 -f alpha /dev/stdin I’ve installed the rtl_fm and multimon packages on my rpi and have Cinergy DVB-T Stick.
Multimon filter or windows#
rtl_fm -f 153.353e6 -g 100 -s 22050 -l 310 – |multimon -t raw -a POCSAG1200 -f alpha /dev/stdinįiled under Linux, MacOS X, OS X, OSX, Programming, rtl-sdr, rtlsdr, SDR, Uncategorized, Windows | 68 Comments | Thanks to Sonny_Jim from #rtlsdr on freenode for trying! It even seems to be lightweight enough to work on a Raspberry Pi. Īpparently you can combine multimonNG with rtl_fm to live decode POCSAG. Superkuh wrote a bit about using multimonNG with GNURadio allowing for realtime decoding. (“-i” is needed for recent versions of multimon-ng) To decode it try “multimonNG.exe -a POCSAG1200 -t raw poc1200.raw”. Some testfile converted to the native multimon format: poc1200 Soundcard input and virtual audio cables should work fine, though.) (It doesn’t come with SoX and as a result can’t handle filetype conversions. GNURadio can also generate the format using the file sink in input mode ‘short’. “sox -t wav infile.wav -esigned-integer -b16 -r 22050 -t raw outfile.raw remix 1” (On Windows using the Qt-MinGW build environment, as well as Cygwin and VisualStudio/MSVC)įiles can be easily converted into multimonNGs native raw format using ‘sox’.Į.g. So far multimonNG has been successfully built on OS X, Debian, Ubuntu and Windows. It’s recommended to use qmake to generate the Makefile. In addition to the deprecated legacy Makefile there is also a file for qmake which is the preferred way of building MultimonNG. Windows native audio and a VisualStudio/MSVC project file, contributed by bzzt_ploink PulseAudio support, contributed by inf_l00p_ Compiles on Windows (MinGW or Cygwin) without format conversion Merged Debian patches for EAS (Emergency Alert System) decoding (untested) Brute-Force BCH implementation for POCSAG forward error correction Option ‘NO_X11’ to disable the X11 dependency since Apple will drop Xorg soon ‘ONLY_RAW’ disables the format conversion while getting rid of posix dependencies
‘DUMMY_AUDIO’ “backend” (Gets rid of the OSS dependency, breaks audio in doing so)
Multimon filter or mac os x#
Basic functionality on Mac OS X ‘Lion’ (Soundcard/OSS input is unsupported) The following changes have been made so far: It decodes the following digital transmission modes: Besides improving POCSAG my main focus was portability, it now even compiles on Windows 🙂 I rewrote large parts of the POCSAG decoder after reading the patent text as well as implemented the BCH forward error correction. Sadly multimon was very broken, after I finally managed to compile it on OS X I realized it had 64bit bugs preventing the decoding on my system. Doing so I found POCSAG (pager) transmissions which I tried to decode using multimon. Due to my recent acquisition of an RTL-SDR compatible radio module (Some would call it DVB-T stick) I started playing with radio transmissions.
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