radioctl1

Usage

Overview

The 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 /dev/radio device.

The options are as follows:

-a

Print all device variables and their current values. This is the default, if no parameters are given to radioctl.

-f file

Specify an alternative radio tuner device.

-n

Suppress printing of the variable name.

-v

Show the possible values of queries.

name=value

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 ‘+’ 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:

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:

channel

Specifies the TV channel. Integer value from 0 to 150. Using the channel control puts the tuner in “TV” mode.

chnlset

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:

nabcst

U.S.A. Broadcast

cableirc

U.S.A. Cable IRC

cablehrc

U.S.A. Cable HRC

weurope

Western Europe

jpnbcst

Japan Broadcast

jpncable

Japan Cable

xussr

Former U.S.S.R. and C.I.S. countries

australia

Australia

france

France

frequency

Specifies the FM frequency in MHz. Float value from 87.5 to 108.0. Using the frequency control puts the tuner in “radio” mode.

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 the reference frequency to be changed.

sensitivity

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 -a.

Environment

The following environment variable affects the execution of radioctl:

RADIODEVICE

The radio tuner device to use.

Files

/dev/radio

radio tuner device

Examples

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