table of contents
miri_fm(1) | User Commands | miri_fm(1) |
NAME¶
miri_fm - a simple narrow band FM demodulator for Mirics based receivers
DESCRIPTION¶
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
USAGE¶
This program captures information from a band of frequencies and outputs the data in a form useful to other software radio programs.
SYNOPSIS¶
miri_fm [-f freq] [OPTIONS] [output file]
OPTIONS¶
- -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
EXPERIMENTAL OPTIONS¶
EXAMPLES¶
- 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).
SEE ALSO¶
AUTHOR¶
This manual page was written by Maitland Bottoms for the Debian project (but may be used by others).
COPYRIGHT¶
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.
2.0.0 | MiriSDR |