62 BASIC OPERATION■ Frequency exchanging(Step 2-2)q After selecting the standby frequency, push [↔] to ex-change it with the active frequency.• Adjust the squelch level in the menu mode, if necessary (p. 24).• Rotate [VOL] to set the volume level, if necessary.• When receiving a signal, “RX” appears and audio is heard fromthe speaker or headset.• Further adjustment of audio level may be necessary at thispoint.w Push and hold [PTT] to transmit, then speak into the mi-crophone.• Transmit indicator “TX” lights.e Release [PTT] to receive.Frequency exchanging can be also performed remotely fromthe yoke-mounted frequency exchange switch.■ Receivingq Select an operating frequency.• Refer to pgs. 5, 6 for details.• “RX” appears when receiving a signal or opening squelch.w Push [VOL] to open the squelch manually.• Refer to p. 20 “Squelch test function” for details.e Rotate the volume control to adjust the audio level.■ Transmittingq Select the yoke-mounted communication/intercom switchto the “communication” position.w Select an operating frequency.• Refer to pgs. 5, 6 in details.e Push the PTT switch.• “TX” appears.r Speak into the microphone at your normal voice level.• DO NOT set the microphone too closely to your mouth or speaktoo loudly. This may distort the signal.t Release the PTT switch to receive.NOTE: To prevent interference, listen on the frequencybefore transmitting. If the frequency is busy, wait until thefrequency is clear.NOTE: DO NOT push and hold [↔] continuously. Oth-erwise, the standby frequency disappears. If this happens,again push and hold [↔] until the standby frequency reap-pears.