E F Johnson Company 2425770 Benutzerhandbuch

3-12 

Viking Portable 600 Radio Operating Manual

The Keypad Lock feature temporarily disables the front panel keys to prevent keys from 
being accidentally pressed. This feature is available if the Keypad Lock option button is 
programmed. To lock the keypad, press the Keypad Lock option button. Then to unlock 
the keypad again, press and hold this button until a tone sounds.

Keypad Lockout can also be programmed disabling controls until the radio is 
reprogrammed. The keypad is permanently disabled and cannot be enabled by the user. 
Additional information on this feature follows.

• The three side buttons amd top emergency button can be programmed so that they are 

locked. (The Emergency function button is never locked out.)

• The “Front Keypad” function can be selected by programming. The front panel keys but 

not the side panel option buttons are then disabled by the preceding Keypad Lock and 
Permanent Lock functions. If this function is not selected, both the front and side panel 
buttons are disabled. The PTT switch is usually not disabled. However, if enabled in 
programming, the radio will ignore PTT attempts when an external microphone is 
attached.

• The Rotary Control, Toggle Control and Volume knob can be programmed so that they 

are locked by the Keypad Lock function.

• The volume control is permanently disabled if a Volume Up/Down option button is 

• The radio may be programmed to enable the backlight when a key that is currently 

locked out is pressed. DTMF dialing may be disabled when programming conventional 
channels.

The radio can receive inhibit commands over the air or through the sideport. When the 
radio receives an inhibit command the screen goes blank, audio stops, lights turn off, and 
most of the controls are disabled. The radio is (from the user's perspective) frozen. Behind 
the scenes, however, the radio is still running. It is waiting for an uninhibit command. If it 
receives an uninhibit command, the radio User Interface is enabled and the radio will 
operate normally. The general idea behind the feature is fairly simple but there are 
exceptions.

• The radio will power down using the power switch even if it is inhibited. The display 

will show "Powering Down…" until the radio turns off.

• The radio will power up using the power switch even if it is inhibited. The display will 

show the boot image and the "Self Test" message but will be blank thereafter.