ioctl FE_SET_TONE &manvol; FE_SET_TONE Sets/resets the generation of the continuous 22kHz tone. int ioctl int fd int request enum fe_sec_tone_mode *tone fd &fe_fd; request FE_SET_TONE tone pointer to &fe-sec-tone-mode; This ioctl is used to set the generation of the continuous 22kHz tone. This call requires read/write permissions. Usually, satellite antenna subsystems require that the digital TV device to send a 22kHz tone in order to select between high/low band on some dual-band LNBf. It is also used to send signals to DiSEqC equipment, but this is done using the DiSEqC ioctls. NOTE: if more than one device is connected to the same antenna, setting a tone may interfere on other devices, as they may lose the capability of selecting the band. So, it is recommended that applications would change to SEC_TONE_OFF when the device is not used. &return-value-dvb; &cs-def; ID Description SEC_TONE_ON Sends a 22kHz tone burst to the antenna SEC_TONE_OFF Don't send a 22kHz tone to the antenna (except if the FE_DISEQC_* ioctls are called)