Icom IC-M88 Instruction Manual - Page 16

4 BASIC OPERATION Receiving and transmitting CAUTION: Transmitting without an antenna may damage the transceiver. q Rotate [VOL] clockwise to turn power ON. w Use the squelch function to mute any audio noise if necessary. After pushing the [SQL] for 1 sec., the squelch function is cut off until [SQL] is released. (default) e Push [SQL] for 1 sec. (see the SET mode on p. 19), and rotate volume to set the audio output level. r Push [Y]/[Z] to select the desired channel. - When receiving a signal, " " appears and audio is emitted from the speaker. - Further adjustment of [VOL] may be necessary at this point. t Push [H/L•LOCK] to select the output power if necessary. - "LOW" appears when low power is selected; "MID" appears when middle power is selected; no indication when high power is selected. - Choose low power to conserve battery power, choose high power for longer distance communications. - Some channels are for low power only. y Push and hold [PTT] to transmit, then speak into the microphone. - "TX" appears. - Channel 70 cannot be used for transmission (for GMDSS use). u Release [PTT] to receive. IMPORTANT: To maximize the readability of your transmitted signal, pause a few sec. after pushing [PTT], hold the microphone 5 to 10 cm (2 to 4 inches) from your mouth and speak at a normal voice level. NOTE: The transceiver has a power save function to conserve the battery power and it cannot be turned OFF. The power save function activates automatically when no signal is received for 5 sec. For U.S.A version: To prevent accidental prolonged transmission, etc., the IC-M88 has a time-out timer function. This timer cuts a transmission OFF after 5 min. of continuous transmission. y Push and hold to transmit u Release to receive q Power ON e Set volume w Opening the squelch r Set channel t Set output power 10