Icom IC-9700 Instruction Manual basic - Page 32

4 RECEIVING AND TRANSMITTING AGC function control SSB, CW, RTTY and AM modes The AGC (Automatic Gain Control) controls receiver gain to produce a constant audio output level, even when the received signal strength greatly varies. LEach band memorizes the AGC setting. DDSelecting the AGC time constant preset value The transceiver has FAST, MID and SLOW preset AGC settings for all modes, except for the FM, DV and DD modes. 1. Select the operating mode. (Example: SSB) 2. Push FUNCTION . ••Opens the FUNCTION screen. 3. Touch [AGC] to select the desired time constant. LTouching [AGC] selects FAST, MID or SLOW. LFor FM, DV and DD modes, FAST is fixed. 4. To close the FUNCTION screen, push EXIT . NOTE: While you are receiving weak signals, and a strong signal is momentarily received, the AGC function quickly reduces the receiver gain. When that signal disappears, the transceiver may not receive the weak signal because of the AGC action. In that case, select FAST, or touch [AGC] for 1 second to open the AGC screen, and then select OFF. DDSetting the AGC time constant You can set the preset AGC time constant to the desired value. 1. Select the operating mode. (Example: SSB) 2. Push FUNCTION . ••Opens the FUNCTION screen. 3. Touch [AGC] for 1 second. ••Opens the AGC (SSB) screen. 4. Touch FAST, MID or SLOW. (Example: MID) You can reset to the default settings by touching this key for 1 second. 5. Rotate MAIN DIAL to set the time constant. 6. To close the AGC (SSB) screen, push EXIT . ••Selectable AGC Time constant (unit: seconds) Mode LSB USB CW/RTTY AM FM DV DD Default 0.3 （FAST） 2.0 （MID） 6.0 （SLOW） 0.1 （FAST） 0.5 （MID） 1.2 （SLOW） 3.0 （FAST） 5.0 （MID） 7.0 （SLOW） 0.1 （FAST） 0.1 （FAST） 0.1 （FAST） Adjustable time constant OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5, 3.0, 4.0, 5.0 or 6.0 OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5, 3.0, 4.0, 5.0 or 6.0 OFF, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 7.0 or 8.0 Fixed Fixed Fixed 4-2