RADIOCTL(1)                OpenBSD Reference Manual                RADIOCTL(1)

NAME
     radioctl - control radio tuners

SYNOPSIS
     radioctl [-f file] [-n] -a
     radioctl [-f file] [-n] name
     radioctl [-f file] [-n] -w name=value

DESCRIPTION
     The radioctl command displays or sets various variables that affect the
     radio tuner behavior. If a variable is present on the command line, ra-
     dioctl prints the current value of this variable for the specified de-
     vice.  By default, radioctl operates on the /dev/radio device.

     The options are as follows:

     -a      Print all device variables and their current values.

     -w name=value
             Attempt to set the specified variable name to value.

     -f file
             Specify an alternative radio tuner device.

     -n      Suppress printing of the variable name.

     Values may be specified in either absolute or relative forms.  The rela-
     tive form is indicated by a prefix of `+' or `-' to denote an increase or
     decrease, respectively.

     The exact set of controls that can be manipulated depends on the tuner.
     The general format (in both getting and setting a value) is

     name = value

     The name indicates what part of the tuner the control affects.

     Write only controls:

     search  Only for cards that allow hardware search. Can be `up' or `down'.

     Read-write controls:

     frequency
             Float value from 87.5 to 108.0.

     volume  Integer value from 0 to 255.

     mute    Mutes the card (volume is not affected), `on' or `off'.

     mono    Forces card output to mono, `on' or `off'. Only for cards that
             allow forced mono.

     reference
             Reference frequency. Can be 25 kHz, 50 kHz and 100 kHz. Not all
             cards allow to change the reference frequency.

     sensitivity
             Station locking sensitivity. Can be 5 mkV, 10 mkV, 30 mkV and 150
             mkV. Not all cards allow to change the station locking sensitivi-
             ty.

     All the remaining controls (signal, stereo and card capabilities) are
     read-only and can be viewed using option -a.

EXAMPLES
     The command

           radioctl -a

     can produce

     volume=255
     frequency=106.30MHz
     mute=off
     reference=50kHz
     signal=on
     stereo=on
     card capabilities:
             manageable mono/stereo

ENVIRONMENT
     The following environment variable affects the execution of radioctl:

     RADIODEVICE  The radio tuner device to use.

FILES
     /dev/radio  radio tuner device

SEE ALSO
     radio(4)

OpenBSD 3.0                   September 16, 2001                             2
