Справочник Пользователя для EFJohnson FM Portable Radio Intrinsically-Safe SMARTNET

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dealer to determine how your switches have been programmed. If no 
option switch has been programmed to control a particular function, that 
function may not be available or may be in a fixed mode.

If the Keypad Lock option switch has been programmed, the keypad 

can be locked (disabled) to prevent keys from being accidentally pressed. 
To lock the keypad, press this switch and a locked keypad is indicated by 
the   icon in the display. To unlock the keypad again, press and hold the 
Keypad Lock switch until a tone sounds. The keypad can also be disabled 
by dealer programming. It is then permanently disabled and cannot be re-
enabled by the user.

When the battery voltage falls below a preset level, the 

 icon 

appears in the display and stays on until power is turned off. In addition, 
the following low battery indications may be programmed to occur: 

•

The amber BATT indicator on the top panel lights.

•

A beep sounds once per minute in the standby mode.

•

A beep sounds each time the PTT switch is pressed.

The battery should be recharged as soon as practical after a low 

battery indication appears. Refer to page 52 for more information. There 
is also a battery saver function that may be programmed which automati-
cally switches to a lower power output level when the site is very near.

Channel Select

To change the current channel, rotate the 16-position channel 

selector knob on the top panel to the desired position. With SMARTNET/
SmartZone channels, the channel is always indicated by alias (name). 
With conventional channels, the channel number or frequency may also 
be displayed (see “Display Mode Selection” on page 25).