Icom IC-9100 Instruction Manual - Page 81

5 FUNCTIONS FOR RECEIVE ■ AGC function The AGC (Auto Gain Control) controls receiver gain to produce a constant audio output level, even when the received signal strength varies greatly. The transceiver has 3 pre-set AGC time constants: fast, mid and slow for SSB, CW, RTTY and AM modes. In the FM and DV modes, the AGC time constant is fixed as "FAST" (0.1 second). D AGC speed selection q Select either the SSB, CW, RTTY or AM mode. (p. 43) w P ush [MENU] to display the "M1" screen (Menu 1), then push [AGC](F-1) one or more times to select AGC fast ( ), AGC mid ( ) or AGC slow ( ). "AGC OFF" appears when the selected AGC speed's time constant is set to OFF. D Setting the AGC time constant q Select either the SSB, CW, RTTY or AM mode. (p. 43) w P ush [MENU] to display the "M1" screen (Menu 1), then hold down [AGC](F-1) for 1 second to display the "AGC" screen. e P ush either [FAST](F-2), [MID](F-3) or [SLOW](F-4) to select the desired AGC speed to be set. • An underline appears below the time constant display. r R otate [MAIN DIAL] to set the desired time constant. • AGC time constant can be set to between 0.1 to 8.0 seconds (depending on the mode) or turned O­ FF. • Hold down [FAST](F-2), [MID](F-3) or [SLOW](F-4) for 1 second to reset to the default setting for the selected time constant, if desired. t S elect another mode (except for FM and DV), then repeat steps e and r, if desired. y P ush [MENU] to save, and exit the "AGC" screen. • Selectable AGC time constant (unit: seconds) Mode Default 0.3 (FAST) SSB 2.0 (MID) 6.0 (SLOW) 0.1 (FAST) CW/RTTY 0.5 (MID) 1.2 (SLOW) 3.0 (FAST) AM 5.0 (MID) 7.0 (SLOW) FM/DV 0.1 (FAST) Selectable AGC 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, 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, 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, 8.0 Fixed [MENU] [AGC] M1 AGC DUP COMP TBW SCP Hold down • When AGC medium is selected AGC FAST 0.3s MID 2.0s SLOW 6.0s SSB Appears under the selected AGC Selected mode speed's time constant display. • When AGC fast is selected AGC FAST 0.3s MID 2.0s SLOW 6.0s SSB • When AGC slow is selected AGC FAST 0.3s MID 2.0s SLOW 6.0s SSB For your information When you are receiving a weak signal, 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, hold down [AGC](F-1) for 1 second, and rotate [MAIN DIAL] to set the time constant to OFF. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 72