Icom IC-7300 Instruction Manual basic - Page 36

4 RECEIVING AND TRANSMITTING Noise Reduction The Noise Reduction function reduces random noise components and enhances desired signals that are buried in noise. The Noise Reduction function uses the DSP circuit. Push NR to turn the Noise Reduction function ON or OFF. Displayed DDAdjusting the Noise Reduction level Adjust the Noise Reduction level to where noise is reduced and the received signal is not distorted. 1. Hold down NR for 1 second. ••Turns ON the Noise Reduction function and opens the NR menu. 2. Adjust the Noise Reduction level to between 0 and 15. LAdjust to a higher level to increase the reduction level, and a lower level to decrease it. Rotate Push Noise Reduction OFF NR level 0 Noise components Noise Reduction ON NR level 4 Desired signal (CW) Notch Filter The IC-7300 has Auto Notch and Manual Notch functions. Auto Notch: Used in the SSB, AM and FM modes. Manual Notch: Used in the SSB, CW, RTTY and AM modes. DDAuto Notch function Auto Notch automatically attenuates beat tones, tuning signals and so on. Push NOTCH until "AN (Auto Notch)" is displayed. LPushing NOTCH changes between "AN (Auto Notch)," "MN (Manual Notch)" and OFF. Displayed DDManual Notch function The Manual Notch attenuates beat tones, tuning signals and so on by adjusting a frequency in the NOTCH menu. 1. Hold down NOTCH for 1 second to display the NOTCH menu. ••The Manual Notch is automatically selected and "MN" is displayed. LPushing [WIDTH] sets the Manual Notch filter width to "WIDE," "MID" or "NAR." 2. Slowly adjust the POSITION to manually attenuate the frequency. Rotate Push NOTE: While adjusting, noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction. 4-6