Icom IC-7600 Instruction Manual - Page 90
■ Notch function, NOTCH], <MODE> CW/AM, AUTO TUNE]
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4 RECEIVE AND TRANSMIT ■ Notch function This transceiver has auto and manual notch functions. The auto notch function uses DSP to automatically attenuate beat tones, tuning signals, etc., even if they are moving. The manual notch can be set to attenuate a frequency via the [NOTCH] control. The auto notch can be used in SSB, AM and FM mode. The manual notch can be used in SSB, CW, RTTY, PSK and AM modes. ➥ P ush [NOTCH] to toggle the notch function between auto, manual and OFF in SSB and AM modes. • Either auto or manual notch function can be deactivated in others set mode. (p. 132) ➥ Push [NOTCH] to turn the manual notch function ON and OFF in CW, RTTY, PSK modes. ➥ Push [NOTCH] to turn the auto notch function ON and OFF in FM mode. • The indicator on this switch lights green when the auto or manual notch function is ON. • When the manual notch function is ON, push and hold [NOTCH] 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 [NOTCH] control. • " " appears when auto notch is in use. • " " appears when manual notch is in use. While tuning the manual notch, noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction. • Auto notch indication NOTCH [NOTCH] control Appears • Manual notch indication Appears Auto notch OFF Auto notch ON Desired signal (AF) Desired signal (AF) ■ Auto tune function CW/AM The automatic tuning function tunes the displayed frequency automatically when an off-frequency signal is received within the range ±500 Hz (CW) or ±5 kHz (AM). This function is active while in CW or AM mode is selected. Unwanted tone frequency Particular frequency is attenuated ➥ Push [AUTO TUNE] to toggle the auto tune func- tion ON or OFF. • " " blinks when auto tune function is acti- vated. • After 2 sec. has passed, the auto tune function stops tuning automatically even it's still off-frequency. Appears AUTO TUNE IMPORTANT! When receiving a weak signal, or receiving a signal with interference, the automatic tuning function may tune the receiver to an undesired signal. NOTE: The automatic tuning function does not active on the sub band. 83