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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.
