Icom IC-F3021 / F4021 Instruction Manual - Page 16

3 BASIC OPERATION I Receiving and transmitting NOTE: Transmitting without an antenna may damage the transceiver. See page 1 for accessory attachments. Receiving: q Rotate [VOL] to turn the power ON. w Push [CH Up] or [CH Down] to select the conventional sys- tem channel, in sequence. e When receiving a call, adjust the audio output level to a comfortable listening level. Transmitting: Wait for the channel to become clear to avoid interference. q Push [Call] when initiating a call from your side. • Coded audio may be heard from the transceiver, then " " appears. • This operation may not be necessary depending on your signaling system. Ask your dealer for details. w While pushing and holding [PTT], speak into the microphone at a normal voice level. e Release [PTT] to return to receive. IMPORTANT: To maximize the readability of your signal; 1. Pause briefly after pushing [PTT]. 2. Hold the microphone 5 to 10 cm (2 to 4 inches) from your mouth, then speak into the microphone at a normal voice level. D Transmitting notes • Transmit inhibit function The transceiver has several inhibit functions which restrict transmission under the following conditions: - The channel is in mute condition ('Inaudible' condition; " " does not appear.) - The channel is busy. - Un-matched (or matched) CTCSS is received. (Depending on the pre-setting.) - The selected channel is a 'receive only' channel. • Time-out timer After continuous transmission for the pre-programmed time period, the time-out timer is activated, causing the transceiver to stop transmitting. • Penalty timer Once the time-out timer is activated, transmission is further inhibited for a period determined by the penalty timer. 12