EFJohnson FM Portable Radio Intrinsically-Safe SMARTNET User Manual

17

The relative volume level can be determined by noting the position 

of the index on the On-Off/Volume knob. To enable a reference tone for 
setting the volume, proceed as follows:

•

If key press tones are enabled (see page 20), a short tone sounds when 
front panel keys are pressed.

•

If a conventional channel is selected and the Monitor option switch is 
programmed (see page 26), pressing that switch unsquelches/squelches 
the receiver and either voice or background noise is heard. If a 
SMARTNET/SmartZone channel is selected, the receiver cannot be 
manually unsquelched.

The backlight for the display and keypad can be manually turned on 

by pressing the Backlight option switch if it is available. It can also be 
dealer programmed to automatically turn on when any key is pressed. It 
then automatically turns off after a programmed delay so that battery 
drain is minimized.

The programmable option switches are as follows:

•

F1, F2, and F3 on front panel. In addition, with full keypad (15-key) 
models, the *, and # keys are programmable.

•

AUX and FCN on the side panel

If your radio is programmed with both conventional and 

SMARTNET/SmartZone channels (see page 23), these option switches 
can be dealer programmed to control a different set of functions for each 
channel type. For example, the F1 switch could select Hi/Lo Power when 
a conventional channel is selected and Private Calls when a 
SMARTNET/SmartZone channel is selected. The available functions in 
each mode are indicated in the tables on pages 9 and 10. If the 
programmed functions are not indicated in these tables, consult your