mirror of
https://github.com/rtlsdrblog/rtl-sdr-blog.git
synced 2024-11-06 02:37:32 +01:00
8a26abaf79
This allows (among others) to build rtl-sdr nightly packages for a variety of distributions as part of the network:osmocom:nightly builds
104 lines
4.0 KiB
Groff
104 lines
4.0 KiB
Groff
.TH "rtl_adsb" 1 "0.5.0" RTL-SDR "User Commands"
|
|
.SH NAME
|
|
rtl_fm \- a simple FM demodulator for RTL2832 based DVB-T receivers
|
|
.SH DESCRIPTION
|
|
Uses a re-purposed DVB-T receiver as a software defined
|
|
radio to receive narrow band FM signals and demodulate
|
|
to audio. Written for and incorporated in the osmocom rtl-sdr project.
|
|
.LP
|
|
Narrowband FM is commonly used by public service agencies and
|
|
commercial dispatch operations in the VHF and UHF bands.
|
|
Also can demodulate Wideband FM, as found in the 88-108 MHz FM
|
|
broadcast band.
|
|
Experimental options include AM, LSB, USB and DSB demodulation.
|
|
.LP
|
|
Much software is available for the RTL2832. Most of the user-level
|
|
packages rely on the librtlsdr library which comes as part of the
|
|
rtl-sdr codebase. This codebase contains both the library itself and
|
|
also a number of command line tools such as rtl_test, rtl_sdr,
|
|
rtl_tcp, and rtl_fm. These command line tools use the library to test
|
|
for the existence of RTL2832 devices and to perform basic data
|
|
transfer functions to and from the device.
|
|
.LP
|
|
Because most of the RTL2832 devices are connected using USB, the
|
|
librtlsdr library depends on the libusb library to communicate with
|
|
the device.
|
|
.SH USAGE
|
|
With a suitable antenna for receiving the signal attached
|
|
to the rtl-sdr supported device, this program will output the
|
|
digital audio data decoded from that signal. The data can be
|
|
listened to by piping to Sox or aplay applications to play the
|
|
stream on the computer sound card.
|
|
.SH SYNOPSIS
|
|
.B rtl_fm [-f freq] [-options] [filename]
|
|
.SH OPTIONS
|
|
.IP "-f frequency_to_tune_to [Hz]"
|
|
use multiple -f for scanning, (requires squelch)
|
|
ranges supported, -f 118M:137M:25k
|
|
.IP "[-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
|
|
.IP "-s sample_rate (default: 24k)"
|
|
.IP "-d device_index (default: 0)"
|
|
.IP "-g tuner_gain (default: automatic)"
|
|
.IP "-l squelch_level (default: 0/off)"
|
|
.IP "-o oversampling (default: 1, 4 recommended)"
|
|
for fm squelch is inverted
|
|
.IP "[-o oversampling (default: 1, 4 recommended)]"
|
|
.IP "-p ppm_error (default: 0)"
|
|
.IP "[-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
|
|
.IP "filename ('-' means stdout)"
|
|
omitting the filename also uses stdout
|
|
.SH Experimental options
|
|
.IP "[-r resample_rate (default: none / same as -s)]"
|
|
.IP "[-t squelch_delay (default: 10)]"
|
|
+values will mute/scan, -values will exit
|
|
.IP "[-F fir_size (default: off)]"
|
|
enables low-leakage downsample filter
|
|
size can be 0 or 9. 0 has bad roll off
|
|
.IP "-A std/fast/lut choose atan math (default: std)"
|
|
.IP filename
|
|
(a '-' dumps samples to stdout)
|
|
(omitting the filename also uses stdout)
|
|
.SH EXAMPLES
|
|
Produces signed 16 bit ints, use Sox or aplay to hear them.
|
|
.IP "rtl_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 ...
|
|
.IP "rtl_fm ... -s 22050 - | multimon -t raw /dev/stdin"
|
|
.SH SEE ALSO
|
|
RTL-SDR wiki documentation:
|
|
.B http://sdr.osmocom.org/trac/wiki/rtl-sdr
|
|
.LP
|
|
Rtl_fm Guide:
|
|
.B http://kmkeen.com/rtl-demod-guide/
|
|
.LP
|
|
.sp
|
|
sox(1), play(1), aplay(1)
|
|
.LP
|
|
Other rtl-sdr programs:
|
|
.sp
|
|
rtl_adsb(1), rtl_eeprom(1), rtl_sdr(1), rtl_tcp(1), rtl_test(1)
|
|
.SH AUTHOR
|
|
This manual page was written by Maitland Bottoms
|
|
for the Debian project (but may be used by others).
|
|
.SH COPYRIGHT
|
|
Copyright (c) 2013 A. Maitland Bottoms <bottoms@debian.org>
|
|
.LP
|
|
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.
|
|
.LP
|
|
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.
|