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1722Re: APRS-IS Rx-only iGate with rtl dongle

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  • mathisono
    May 18, 2013
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      sudo rtl_fm -f 144390000 | multimonNG -a AFSK1200 -t raw /dev/stdin

      This dosent yeald 144.390mhz????

      multimonNG (C) 1996/1997 by Tom Sailer HB9JNX/AE4WA
      (C) 2012 by Elias Oenal
      available demodulators: POCSAG512 POCSAG1200 POCSAG2400 EAS UFSK1200 CLIPFSK AFSK1200 AFSK2400 AFSK2400_2 AFSK2400_3 HAPN4800 FSK9600 DTMF ZVEI SCOPE
      Enabled demodulators: AFSK1200
      Found 1 device(s):
      0: Generic, RTL2832U, SN: 77771111153705700

      Using device 0: Generic RTL2832U (e.g. hama nano)
      Found Elonics E4000 tuner
      Oversampling input by: 42x.
      Oversampling output by: 1x.
      Buffer size: 8.13ms
      Tuned to 144642000 Hz.
      Sampling at 1008000 Hz.
      Output at 24000 Hz.
      Exact sample rate is: 1008000.009613 Hz
      Tuner gain set to automatic.
      --------------------------------

      something is off! the input sxntax is diffrent. as seen on the RTL site.
      ------------------
      For example, the following command will do reception of commercial wide-band FM signals:

      rtl_fm -f 96.3e6 -W -s 200000 -r 48000 - | aplay -r 48k -f S16_LE
      On a Mac, a similar command that works is as follows. This assumes that the sox package is installed, 'port install sox':

      rtl_fm -f 90100000 -W -s 200000 -r 48000 - | play -r 48000 -t s16 -L -c 1 -
      ---------------------------

      Im not sure were the problem resides? Ive never encountered this, as that ive only used the tcp_server, ive never had SET the RTL to a specific FRZ. 144.14e6 results in: 144392000 Hz.

      73 Mathison
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