control radio tuners
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,
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
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:
indicates what part of the tuner the
Write only controls:
- Only for cards that allow hardware search. Can be
- 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
- 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),
- Forces card output to mono,
off’. Only for cards that allow
- 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
All the remaining controls (mode, signal, stereo and card capabilities) are
read-only and can be viewed using option -a
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
command first appeared in