Setting VOX on HT644

Press the [MEM] button & switch the transceiver on.

The VOX symbol & a "0" will flash.

"0" indicates VOX is switched off, 1 is for low sensitivity, 5 is for normal sensitivity, and 9 is for
high sensitivity.

Use the [UP/DOWN] button to select the desired level, press [MEM] to confirm, the transceiver is now set to VOX.

To switch VOX off, go back into VOX programming mode by holding the [MEM] key whilst switching on. Press the UP/DOWN button until the vox level is "off" and press [MEM] to confirm.