User's Manual

Page 8/11
H (HOME) KEY
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.
S (SCAN) KEY
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.
F1 KEY
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.
F2 KEY
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.
10 KEY (SC- 580, SC-280 full key model only)
Press the keys on the 10 keypad to make DTMF calls or to activate programmable
functions.
PTT SWITCH
Enables transmit mode.
SHIFT (shift/key lock) KEY
Enables or disables the SHIFT mode. Pressing this key for the longer than 2seconds will
enable or disable keypad operation.