Smart Communications Ltd SC280 Manuel D’Utilisation

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In the conventional and LTR® trunking system, it returns the radio working system to the 

programmed HOME system and group. 

This key also activates the DTMF “A” tone during transmission. 

 

Pressing this key for longer than 2 seconds changes the radio operation between the 

conventional / LTR® trunking system.   

In the conventional and LTR® trunking system, when the SYSTEM/GROUP control is set to 

the “F” position, the S (scan) key initiates scanning and is used for storing channels in scan 

memory. 

This key also activates the DTMF “B” tone during transmission. 

 

In the conventional and LTR® trunking system, when the SYSTEM/GROUP control is set to 

the “F” position, pressing this key decreases the Group number, or decreases the System 

number in the shift mode. 

This key also activates the DTMF “C” tone during transmission. 

 

In the conventional and LTR® trunking system, when the SYSTEM/GROUP control is set to 

the “F” position, pressing this key increases the Group number, or increases the System 

number in the shift mode. 

This key also activates the DTMF “D” tone during transmission. 

 

Press the keys on the 10 keypad to make DTMF calls or to activate programmable 

functions. 

 

Enables transmit mode. 

 

Enables or disables the SHIFT mode. Pressing this key for the longer than 2seconds will 

enable or disable keypad operation.