E F Johnson Company 2424140 Benutzerhandbuch

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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 approxi-
mately 30 seconds without a battery attached. There-
fore, be sure to reattach a battery within that time. Refer 
to Section 10.2 for more information on encryption 
keys.

There is a battery saver feature that can be 

enabled by programming. This feature functions on 
trunked channels only, and it automatically selects low 
transmit power when the receive signal strength 
(RSSI) indicates that the site is nearby. 

3.4.2  BATTERY CHARGING

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 of approximately 50 
mA is less than the radio standby current of approxi-
mately 200 mA. 

Do not expose the charger base to high level RF 

signals while a battery is being charged because this 
may cause a charger fuse to blow (especially in the 

UHF range). Radios programmed for SMARTNET/
SmartZone operation, for example, may affiliate while 
in the charger which causes them to automatically key. 
Therefore, do not leave radio power on while charging 
as described above.

The backlight for the display and option keys can 

be programmed to automatically turn on when any key 
is pressed. It then automatically turns off after a 
programmed delay of 0-7.5 seconds so that battery 
drain is minimized. If the Backlight option switch or 
menu parameter is programmed, the user can manually 
turn the backlight on and off (it then stays on). If the 
Surveillance mode is programmed, the backlight is 
disabled (see Section 4.7). The radio can be 
programmed so that the backlight turns on in the 
keypad lock mode when a key is pressed (see next 
section). 

The Keypad Lock feature temporarily disables 

the front panel keys to prevent keys from being acci-
dentally pressed. This feature is available if the 
Keypad Lock option switch is programmed. To lock 
the keypad, simply press the Keypad Lock option 
switch. Then to unlock the keypad again, press and 
hold this switch until a tone sounds (approximately 1 
second).

Permanent Keypad Lockout can also be 

programmed. The keypad is then permanently disabled 
and cannot be enabled by the user. Additional informa-
tion on this feature is as follows:

•

A global “Front Keypad Lockout Only” function 
can be selected by programming. The front panel 
keys but not the side panel option keys are then 
disabled by the preceding Keypad Lock and Perma-
nent Lock functions. If this function is not selected, 
both the front and side panel keys are disabled. The 
PTT switch is never disabled. 

•

The Channel Selector and Volume controls can be 
programmed so that they are locked by the Keypad 
Lock function.

•

The “Channel Selector Enabled” function can be 
programmed globally. If this is not selected, the