143 CONVENTIONAL OPERATION Receiving and transmittingNOTE: Transmitting without an antenna may damage the trans-ceiver. See p. 2 for antenna attachment.Receiving:q Rotate [VOL] to turn power ON.w Toggle [CHANNEL SWITCH] (IC-F14S/F24S), rotate [CHAN-NEL SELECTOR] (IC-F14/F24/F26-L) or push one of [MR-CH1] to [MR-CH 4] key to select a channel.For IC-F14S/F24S:The memory channels 3 and 4 are available when [MR-CH 3]and [MR-CH 4] keys are assigned.e When receiving a call, adjust the audio output level to a comfort-able listening level.Transmitting:Wait for the channel to become clear to avoid interference.q While pushing and holding [PTT], speak into the microphone ata normal voice level.• When a tone signalling system is used, the call procedure de-scribed on p. 13 may be necessary.w 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 yourmouth, then speak into the microphone at a normal voicelevel.