miri_fm - a simple narrow band FM demodulator for Mirics based receivers

       This manual page was written by Maitland Bottoms for the Debian project (but may be used by others).

       Copyright (c) 2023 A. Maitland Bottoms <bottoms@debian.org>

       This  program  is  free  software:  you  can  redistribute it and/or modify it under the terms of the GNU
       General Public License as published by the Free Software Foundation, either version 2 of the License,  or
       (at your option) any later version.

       This  program  is  distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
       the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General  Public
       License for more details.

MiriSDR                                               2.0.0                                           miri_fm(1)

       Software for the Mirics MSi2500 + MSi001 SDR platform

       written because people could not do real time FM demod on Atom hardware with GNU radio based on rtl_sdr.c
       and rtl_tcp.c

       Produces signed 16 bit ints, use Sox or aplay to hear them.

       miri_fm ... | play -t raw -r 24k -es -b 16 -c 1 -V1 -

                   | aplay -r 24k -f S16_LE -t raw -c 1

          -M wbfm  | play -r 32k ...

          -s 22050 | multimon -t raw /dev/stdin

       If the device can't be opened, make sure you have the appropriate rights to access  the  device  (install
       udev-rules from the repository, or run it as root).

       -r resample_rate (default: none / same as -s)

       -t squelch_delay (default: 10)

          +values will mute/scan, -values will exit

       -F fir_size (default: off)

          enables low-leakage downsample filter

          size can be 0 or 9.  0 has bad roll off

       -A std/fast/lut choose atan math (default: std)

       miri_fm - a simple narrow band FM demodulator for Mirics based receivers

       -f frequency_to_tune_to [Hz]

          use multiple -f for scanning (requires squelch)

          ranges supported, -f 118M:137M:25k

       -M modulation (default: fm)

          fm, wbfm, raw, am, usb, lsb

          wbfm == -M fm -s 170k -o 4 -A fast -r 32k -l 0 -E deemp

          raw mode outputs 2x16 bit IQ pairs

       -s sample_rate (default: 24 kHz)

       -d device_index (default: 0)

       -T device_type device variant (default: 0)

          0:       Default

          1:       SDRPlay

       -g tuner_gain (default: automatic)

       -m sample format (default: auto)

          504:    S8 (fastest)

          384:    S10 +2bits

          252:    S14

       -e USB transfer mode (default: 1)

          1:      Isochronous (maximum 196.608 Mbit/s)

          2:      Bulk (maximum 333Mbit/s, depends on controller type)

       -i IF mode (default: ZERO)

          0:       ZERO

          450000:  450 kHz

          1620000: 1620kHz

          2048000: 2048kHz

       -w BW mode (default: 8MHz)

          200000:  200kHz

          300000:  300kHz

          600000:  600kHz

          1536000: 1536kHz

          5000000: 5MHz

          6000000: 6MHz

          7000000: 7MHz

          8000000: 8MHz

       -l squelch_level (default: 0/off)

       -o oversampling (default: 1, 4 recommended)

       -p ppm_error (default: 0)

       -E enable_option (default: none)

          use multiple -E to enable multiple options

          edge:   enable lower edge tuning

          dc:     enable dc blocking filter

          deemp:  enable de-emphasis filter

          direct: enable direct sampling

          offset: enable offset tuning

       filename ('-' means stdout)

                omitting the filename also uses stdout

miri_sdr(1)

miri_fm[-ffreq][OPTIONS][outputfile]

       This  program  captures  information  from a band of frequencies and outputs the data in a form useful to
       other software radio programs.