Loading ...
Sorry, an error occurred while loading the content.

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

Expand Messages
  • mathisono
    May 18, 2013
    • 0 Attachment
      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
    • Show all 30 messages in this topic