Icom IC-R9500 Instruction Manual - Page 82

5 RECEIVE FUNCTIONS ■ Noise reduction [NR] [NR] control ■ Notch function [ANF] [NOTCH1] [NOTCH2] [NOTCH1] control [NOTCH2] control • Auto notch indication • Manual notch indication The noise reduction function reduces random noise components and enhances desired signals which are buried in noise. The DSP performs the random noise reduction function. q Push the [NR] to turn the noise reduction ON. • [NR] indicator above this switch lights green. w Rotate the [NR] control to adjust the noise reduction level. ePush the [NR] switch to turn the noise reduction OFF. • [NR] indicator lights off. Setting the [NR] control too high can result in audio signal masking or distortion. Set the [NR] control for maximum readability. This receiver has auto and manual notch functions. The auto notch function uses DSP to automatically attenuates up to 3 beat tones, tuning signals, etc., even if they are moving. The manual notch can be set to attenuate a frequency via the [NOTCH1]/[NOTCH2] controls. The auto notch can be used in SSB, AM, FM and WFM modes. The manual notch can be used in SSB, CW, FSK and AM modes. ➥ Push [ANF] to turn the auto notch function ON and OFF in FM, WFM, AM and SSB modes. • [ANF] indicator above this switch lights green. • " AN " appears when auto notch is in use. ➥ Push [NOTCH1] or [NOTCH2] to turn the manual notch function ON and OFF, manual and OFF in AM, SSB, CW and FSK modes. • [NOTCH1]/[NOTCH2] indicators above these switches light green. • " MN1 " or " MN2 " appear when manual notch is in use. • Push and hold [NOTCH1] or [NOTCH2] for 1 sec. to select the notch filter width for manual notch from wide, middle and narrow. • Set to attenuate a frequency for manual notch via the [NOTCH1] or [NOTCH2] controls. While tuning the manual notch, noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction. 5-16