control radio tuners
command displays or sets various variables
that affect the radio tuner behavior. If a variable is present on the command
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 name to
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
- Specifies the TV channel. Integer value from 0 to 150. Using the
channel control puts the tuner in “TV”
- 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
- 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 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.
Print all device variables, along with their current values:
- radio tuner device
$ radioctl -a
radioctl command first appeared in