control radio tuners
radioctl command displays or sets
various variables that affect the radio tuner behavior. If a variable is
present on the command line,
radioctl prints the
current value of this variable for the specified device. By default,
radioctl operates on the
The options are as follows:
- Print all device variables and their current values. This is the default,
if no parameters are given to
- Specify an alternative radio tuner device.
- Suppress printing of the variable name.
- Show the possible values of queries.
- Attempt to set the specified variable name to value.
Values may be specified in either absolute or relative forms. The
relative form is indicated by a prefix of
-’ to denote an increase or decrease,
The exact set of controls that can be manipulated depends on the tuner. The general format (in both getting and setting a value) is:
The name indicates what part of the tuner the control affects.
Write only controls:
- Only for cards that allow hardware search. Can be
up’ or ‘
- Specifies the TV channel. Integer value from 0 to 150. Using the channel control puts the tuner in “TV” mode.
- Specifies the TV channel set. The tuner uses the current channel set to
derive a frequency from the channel. The following
is a list of valid channel sets:
- U.S.A. Broadcast
- U.S.A. Cable IRC
- U.S.A. Cable HRC
- Western Europe
- Japan Broadcast
- Japan Cable
- Former U.S.S.R. and C.I.S. countries
- Specifies the FM frequency in MHz. Float value from 87.5 to 108.0. Using the frequency control puts the tuner in “radio” mode.
- Integer value from 0 to 255.
- Mutes the card (volume is not affected),
on’ or ‘
- Forces card output to mono, ‘
on’ or ‘
off’. Only for cards that allow forced mono.
- Reference frequency. Can be 25 kHz, 50 kHz and 100 kHz. Not all cards allow the reference frequency to be changed.
- Station locking sensitivity. Can be 5 mkV, 10 mkV, 30 mkV and 150 mkV. Not all cards allow the station locking sensitivity to be changed.
All the remaining controls (mode, signal, stereo and card
capabilities) are read-only and can be viewed using option
The following environment variable affects the execution of
- The radio tuner device to use.
- radio tuner device
Print all device variables, along with their current values:
$ radioctl -a volume=255 channel=0 chnlset=weurope frequency=106.30MHz mute=off reference=50kHz signal=on stereo=on mode: radio card capabilities: manageable mono/stereo
radioctl command first appeared in