Icom IC-4A Instruction Manual page 16

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will work as follows:
Digit Working frequency band
0 440MHz
1 441MHz
2 442MHz
3 | 443MHz
4 444MHz
5 445MHz
6 446MHz
7 447MHz
| 8 448MHz
| 9 449MHz |
(2 PUSH TO TALK (PTT) SWITCH
For transmission, press this switch and talk into the microphone with normal voice. The internal
microphone is of the electret-condenser type and provides good pickup for all levels of voice.
*DUAL-TONE ENCODER PAD
IC-4AT has a 16 key dual-tone encoder pad on the front panel. The pad can be used for auto-
patch, accessing to a closed repeater, and/or other controls.