Kenwood TH-75A Instruction Manual page 8

@ MHz/STEP key
@ DUAL/DUP key
@ 1/AL key
This key is used to turn memory channel 1 ON or OFF.
Pressing the key within 10 seconds of pressing the ENT
key will enter number 1.
Pressing the key within 10 seconds of pressing the F key
will check Memory Channel 1 at approx. 5 second inter-
vals. If the channel is busy, a beep will sound.
© 2/T.ALT key
This key is used to turn memory channel 2 ON or OFF.
Pressing the key within 10 seconds of pressing the ENT
key will enter number 2.
Pressing the key within 10 seconds of pressing the F key
will turn the Tone Alert function ON or OFF.
3/CTCSS key
This key is used to turn memory channel 3 ON or OFF.
Pressing the key within 10 seconds of pressing the ENT
key will enter number 3.
Pressing the key within 10 seconds of pressing the F key
will turn the CTCSS function ON or OFF.
@ 4/TO/CO keys
This key is used to turn memory channel 4 ON or OFF.
Pressing the key within 10 seconds of pressing the ENT
key will enter number 4.
Pressing the key within 10 seconds of pressing the F key
will toggle the hold/resume mode alternately from Time
Operated scan to Carrier Operated scan.