Provided by: osmocom-analog_0.0~git20250208.4ebf64f-1build1_amd64 
NAME
imts - http://osmocom-analog.eversberg.eu/docs/
SYNOPSIS
imts -k <kanal/channel> -b 5 -i 0.1 [options] [station_id]
Global options:
-h --help
This help
--config [~/]<path to config file>
Give a config file to use. If it starts with '~/', path is at home dir. Each line in config file
is one option, '-' or '--' must not be given! Default: '~/.osmocom/analog/imts.conf'
--no-config
Even if a config file exists, don't use it.
-v --verbose <level> | <level>,<category>[,<category>[,...]] | list
Use 'list' to get a list of all levels and categories. Verbose level: digit of debug level
(default = '3') Verbose level+category: level digit followed by one or more categories -> If no
category is specified, all categories are selected
-v --verbose date
Show date with debug output
-k --kanal <channel>
-k --channel <channel>
Channel (German = Kanal) number of "Sender" (German = Transceiver)
-a --audio-device hw:<card>,<device>[/hw:<card>.<rec-device>]
Sound card and device number (default = 'hw:0,0') You may specify a different recording device by
using '/'. Don't set it for SDR!
-s --samplerate <rate>
Sample rate of sound device (default = '48000')
-i --interval 0.1..25
Interval of processing loop in ms (default = '1.0' ms) Use 10 to drastically reduce CPU usage. In
case of buffer underrun, increase buffer accordingly.
-b --buffer <ms>
How many milliseconds are processed in advance (default = '50') A buffer below 10 ms requires low
interval like 0.1 ms.
-p --pre-emphasis
Enable pre-emphasis, if you directly connect to the oscillator of the transmitter. (No
pre-emphasis done by the transmitter.)
-d --de-emphasis
Enable de-emphasis, if you directly connect to the discriminator of the receiver. (No de-emphasis
done by the receiver.)
--rx-gain <dB>
Raise/lower receiver's RX level by given gain in dB. (Works with sound card only.)
--tx-gain <dB>
Raise/lower transmitters's RX level by given gain in dB. (Works with sound card only.)
-e --echo-test
Use echo test, to send back audio from mobile phone's microphone to the speaker. (German:
'Blasprobe').
-c --call-device hw:<card>,<device>[/hw:<card>.<rec-device>]
Sound card and device number for headset (default = '') You may specify a different recording
device by using '/'.
--call-samplerate <rate>
Sample rate of sound device for headset (default = '48000')
--call-buffer <ms>
How many milliseconds are processed in advance (default = '50')
-x --osmocc-cross
Enable built-in call forwarding between mobiles. Be sure to have at least one control channel and
two voice channels. Alternatively use one combined control+voice channel and one voice channels.
-o --osmocc-sock
Disable built-in call control and offer socket
--cc "<osmo-cc arg>" [--cc ...]
Pass arguments to Osmo-CC endpoint. Use '-cc help' for description.
--no-l16
Disable L16 (linear 16 bit) codec.
-t --tones 0 | 1
Connect call on setup/release to provide classic tones towards fixed network (default = '1')
-l --loopback <type>
Loopback test: 1 = internal | 2 = external | 3 = echo
-r --realtime <prio>
Set prio: 0 to disable, 99 for maximum (default = 0)
--fast-math
Use fast math approximation for slow CPU / ARM based systems.
--write-rx-wave <file>
Write received audio to given wave file.
--write-tx-wave <file>
Write transmitted audio to given wave file.
--read-rx-wave <file>
Replace received audio by given wave file.
--read-tx-wave <file>
Replace transmitted audio by given wave file.
--limesdr
Auto-select several required options for LimeSDR
--limesdr-mini
Auto-select several required options for LimeSDR Mini
SDR options:
--sdr-soapy
Force SoapySDR driver
--sdr-channel <channel #>
Give channel number for multi channel SDR device (default = 0)
--sdr-device-args <args>
--sdr-stream-args <args>
--sdr-tune-args <args>
Optional SDR device arguments, separated by comma e.g. --sdr-device-args
<key>=<value>[,<key>=<value>[,...]]
--sdr-samplerate <samplerate>
Sample rate to use with SDR. By default it equals the regular sample rate.
--sdr-lo-offset <Hz>
Give frequency offset in Hz to move the local oscillator away from the target frequency. (default
= -1000000)
--sdr-bandwidth <bandwidth>
Give IF filter bandwidth to use. If not, sample rate is used.
--sdr-rx-antenna <name>
SDR device's RX antenna name, use 'list' to get a list
--sdr-tx-antenna <name>
SDR device's TX antenna name, use 'list' to get a list
--sdr-clock-source <name>
SDR device's clock sourc name, use 'list' to get a list
--sdr-rx-gain <gain>
SDR device's RX gain in dB (default = 0.0)
--sdr-tx-gain <gain>
SDR device's TX gain in dB (default = 0.0)
--write-iq-rx-wave <file>
Write received IQ data to given wave file.
--write-iq-tx-wave <file>
Write transmitted IQ data to given wave file.
--read-iq-rx-wave <file>
Replace received IQ data by given wave file.
--read-iq-tx-wave <file>
Replace transmitted IQ data by given wave file.
--sdr-swap-links
Swap RX and TX frequencies for loopback tests over the air.
--sdr-timestamps 1 | 0
Use TX timestamps on UHD device. (default = 1)
Network specific options:
-S --squelch <dB> | auto
Use given RF level to detect loss of signal. When the signal gets lost and stays below this level,
the connection is released. Use 'auto' to do automatic noise floor calibration to detect loss.
Only works with SDR! (disabled by default)
-P --push-to-talk
Allow push-to-talk operation for IMTS mode. (MTS always uses it.) This adds extra delay to
received audio, to eliminate noise when the transmitter of the phone is turned off. Also this
disables release on loss of RF signal. (Squelch is required for this to operate.)
-F --fast-seize <delay in ms>
To compensate audio processing latency, give delay when to respond, after detection of Guard tone
from mobile phone. Run software in loopback mode '-l 2' to measure round trip delay. Subtract
delay from 350 ms. If the phone has different Guard tone length, subtract from that value.
-D --detector-test <idle length> <seize length> <silence length>
Transmit detector test signal, to adjust decoder inside mobile phone. Give length of idle / seize
and silence in seconds. Listen to it with a radio receiver. To exclude an element, set its length
to '0'. Example: '-D 0.5 0.5 0' plays alternating idle/seize tone.
MTS mode options
-M --mts
Run base station in MTS mode, rather than in IMTS mode.
-O --operator <number>
Give number to dial when mobile station initiated a call in MTS mode. Because there is no dial on
the mobile phone, operator assistance is required to complete the call. By default, the operator
'010' is dialed.
-D --detector-test <600 Hz length> <1500 Hz length> <silence length>
Transmit detector test signal, to adjust decoder inside MTS phone. Give length of 600/1500 Hz and
silence in seconds. Listen to it with a radio receiver. To exclude an element, set its length to
'0'. Example: '-D 0.5 0.5 0' plays alternating 600/1500 Hz tone.
station_id: Give 5, 7 or 10 digits of station ID,
so you don't need to enter it for every start of this application. Give 5 digits for MTS number
format. Give 7 digits for IMTS number format. Give 10 digits for IMTS number (digits 4..6 will
br removed). You may use '1xxxxxxxxxx' as prefix. You may use '+1xxxxxxxxxx' as prefix.
Press digits '0'..'9' and then 'd' key to dial towards mobile station. Press 'h' key to hangup. Press
'w' key to toggle display of RX wave form. Press 'c' key to toggle display of channel status. Press 'm'
key to toggle display of measurement value. Press 'q' key to toggle display of RX I/Q vector. Press 's'
key to toggle display of RX spectrum. Press 'b' key to remove DC level.
imts(1)