Icom IC-9100 Instruction Manual - Page 11

1 PANEL DESCRIPTION o M AIN BAND RF GAIN CONTROL/ SQUELCH CONTROL [RF/SQL] (outer control; p. 44) Rotate to adjust the RF gain and squelch threshold level for the MAIN Band. The squelch removes noise output to the speaker when no signal is received. (closed condition) !0 M AIN BAND AF CONTROL [AF] (inner control; p. 45) Rotate to adjust audio output level to the speaker or headphones on the MAIN Band. Increases • T he squelch is particularly effective for AM and FM, but also works in other modes. • T he 12 to 1 o'clock position is recommended for the most effective use of the [RF/SQL] control. • [RF/SQL] operates as only an RF gain control in SSB, CW and RTTY (Squelch is fixed open), or a squelch control in AM, FM and DV (RF gain is fixed at maximum sensitivity), when "Auto" is selected as the "RF/ SQL Control" item option in the Set mode. (p. 162) • When used as an RF gain/squelch control Squelch is open. Noise squelch (FM/DV modes) Recommended level Maximum RF gain RF gain adjustable range S-meter squelch • When used as an RF gain control (Squelch is fixed open; SSB, CW and RTTY only) Adjustable range Minimum RF gain Maximum RF gain While rotating the RF gain control, a faint noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction. • When used as a squelch control (RF gain is fixed at maximum.) Noise squelch (FM/DV modes) Noise squelch threshold (FM mode) S-meter squelch threshold Squelch is open. S-meter squelch Shallow Deep Decreases !1 NOTCH SWITCH [NOTCH] (p. 77) (Mode = Auto notch : SSB/AM/FM Manual notch: SSB/CW/RTTY/AM) ➥ In the SSB and AM modes, push to toggle the notch function between auto, manual and OFF. • Either the Auto or Manual notch function can be turned OFF in the "[NOTCH] SW" item of the Set mode. (p. 36) ➥ In the FM mode, push to turn the Auto Notch function ON or OFF. ➥ In the CW or RTTY mode, push to turn the Manual Notch function ON or OFF. • "MNF" appears when the Manual Notch function is ON. • "ANF" appears when the Auto Notch function is ON. • No indicator appears when the notch filter is OFF. ➥ H old down for 1 second to switch the manual filter characteristics from wide, mid and narrow, when the Manual Notch function is selected. ✔ What is the notch filter? The notch filter is a narrow filter that eliminates unwanted CW or AM carrier tones, while preserving the desired voice signal. The DSP circuit automatically adjusts the notch frequency to effectively eliminate unwanted tones. !2 M ANUAL NOTCH FILTER CONTROL [NOTCH] (outer control; p. 77) Rotate to adjust the notch frequency to reject an interfering signal while the manual function is ON. • Notch filter center frequency: SSB/RTTY : -1040 Hz to +4040 Hz CW : C W pitch freq. -2540 Hz to CW pitch freq. +2540 Hz AM : -5060 Hz to +5100 Hz Higher frequency Lower frequency The optional UX-9100 is required for 1200 MHz frequency band operation. The optional UT-121 is required for DV mode operation. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 2