14. FILTER KEY
➥ Push momentarily to cycle the IF filter settings between wide, middle and narrow for the selected operating mode.
➥ Push and hold for 1 sec. to enter the filter set mode.
15. SPCH•LOCK KEY
➥ Push to announce the selected frequency and S-meter level by the speech synthesizer.
• The parameters to be announced can be selected in the set mode.
➥ Push and hold for 1 sec. to turn the dial lock function ON or OFF.
• The dial lock function electronically locks the main dial.
• ” appears while the dial lock function is ON.
16. POWER KEY
➥ Push to turn power ON. (Turn the DC power supply ON in advance.)
➥ Push and hold for 1 sec. to turn power OFF.
17. TUNER KEY
➥ Push to turn the automatic antenna tuner function ON or OFF.
• An optional antenna tuner must be connected.
• appears on the display.
➥ Push and hold for 1 sec. to manually tune the antenna tuner.
• An optional antenna tuner must be connected.
• When the tuner cannot tune the antenna, the tuning circuit is bypassed automatically after 20 sec.
18. RF GAIN/SQUELCH CONTROL [RF/SQL]
➥ Adjusts the RF gain and squelch threshold level.
➥ The squelch removes noise output from the speaker (closed condition) when no signal is received.
• The squelch is available for all modes.
• The control can be set as the squelch plus RF gain controls, squelch control only (RF gain is fixed at maximum) or Auto (RF gain
control in SSB, CW and RTTY; squelch control in AM) in set mode:
19. AF CONTROL [AF]
➥Varies the audio output level from the speaker.
20. HEADPHONE JACK [PHONES]
➥Accepts headphones with 8–16 Ω impedance.
• Output power: 5 mW with an 8 Ω load.
• When headphones are connected, no receive audio comes from the speaker.
21. MICROPHONE CONNECTOR [MIC]
➥Accepts supplied or optional microphone.
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