E F Johnson Company 2425770 Benutzerhandbuch

Viking Portable 600 Radio Operating Manual

3-9

A low-battery condition is indicated by the 

 icon in the display. The battery should 

be recharged or replaced as soon after this indication appears. Once this indication 
appears, it stays on until power is cycled.

The following additional low battery indications and conditions may be enabled by 
programming:

• A chirp sounds once a minute in the receive standby and transmit modes.

• A chirp sounds each time the PTT switch is pressed.

• The top panel LED indicator flashes red every 30 seconds in the receive mode.

• Low power is selected when transmitting. 

As indicated in the preceding note, the radio may need to be connected to a constant power 
source to preserve the encryption keys in memory. This is required if “infinite key 
retention” is not programmed. To allow the battery to be changed without losing the keys 
with this feature disabled, storage capacitors maintain the supply voltage to memory for 
approximately 3.5 minutes without a battery attached. Therefore, be sure to reattach a 
battery within that time. Refer to Section 8 for more information on encryption keys.

The battery can be charged separately or while attached to the radio. When it is charged 
while attached to the radio, radio power should be turned off. If it is not, the battery begins 
slowly discharging when the charger enters the trickle charge mode. This mode is 
indicated by a green Ready indication, and it is entered automatically when the battery is 
nearly fully charged. Gradual discharging occurs in the trickle mode because the charge 
current is less than the radio standby current (of approximately 200 mA).

Be sure to read the instructions for operation of the battery charger, and follow all of them 
carefully.