Sdrcfg.txt

config file: (re-read every some seconds and may be modified any time)
  # comment
  p <cmd> <value>  rtl_tcp parameter like 'p 5 50' ppm, 'p 8 1' autogain on
  f <mhz> <AFC-range> <squelch%> <lowpass%>  <IF-width>  FM Demodulator
  a <mhz>  0          <squelch%> <lowpass%>  <IF-width>  AM Demodulator
  u <mhz> <IF-shift>   0         <agc speed> <IF-width>  USB Demodulator
  l same for LSB
    AFC-range in +-kHz, Squelch 0 off, 100 open, 70 may do
    audio lowpass in % Nyquist frequ. of output sampelrate, 0 is off
    IF-width 3000 6000 12000 24000 48000 96000 192000Hz for low CPU usage
    (192000 only with >=2048khz iq-rate), (4th order IIR)
    (SSB 8th order IF-IIR), OTHER values with MORE CPU-load (12000 default)

  example:
    p 5 50
    p 8 1
    f 438.825   5   75 70         (afc, quelch, audio lowpass, 12khz IF)
    f 439.275   0   0  80 20000   (20khz IF, uses more CPU)
    u 439.5001 -700 0  0  600     (USB with 600Hz CW-Filter at 800Hz

  will generate 3 channel 16bit PCM stream (up to 64 channels with -z or -Z)
  use max. 95% of -i span. rtl-stick will be tuned to center of the span
  rx in center of band will be +-10khz relocated to avoid ADC-DC offset pseudo
  carriers, SSB-only will be relocated 10..210khz to avoid inexact tuning steps

    f 100.1 0 0 15 96000          (WFM with "-r 192000 -d 44100" for 1 channnel 44100hz