Icom IC-7100 Advanced Instructions - Page 98
AGC function, AGC speed selection, Setting the AGC time constant
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Previous view 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 greatly varies. The transceiver has 3 pre-set AGC time constants: fast, mid and slow for SSB, CW, RTTY and AM modes. In the FM , WFM and DV modes, the AGC time constant is fixed as "FAST" (0.1 second). DDAGC speed selection qqOn the Mode selection screen, select either the SSB, CW, RTTY or AM mode. (p. 3-17) wwPush MENU (C) one or more times to select the "M-2" screen (M-2 menu). eeTouch [AGC](D) to select AGC-F (FAST), AGC-M (MID) or AGC-S (SLOW). "AGC OFF" appears when the selected AGC speed's time constant is set to OFF. Left Display Center Right The L, R, C or D in the instructions indicate the part of the controller. L: Left side R: Right side C: Center bottom D: Display (Touch screen) DDSetting the AGC time constant qqOn the Mode selection screen, select either the SSB, CW, RTTY or AM mode. (p. 3-17) wwPush MENU (C) one or more times to select the "M-2" screen (M-2 menu). eeTouch [AGC](D) for 1 second to display the "AGC" screen. rrTouch either [FAST], [MID] or [SLOW](D) to select the desired AGC speed to be set. • The selected AGC speed's time constant is highlighted. ttRotate the Dial to set the selected time constant. • AGC time constant can be set to between 0.1 to 8.0 sec- onds (depending on the mode) or turned O FF. • If desired, touch [DEF](D) for 1 second to reset to the default setting for the selected time constant. yyIf desired, select another mode (any other than the FM, WFM or DV), then repeat steps e and r. uuPush MENU (C) to exit the "AGC" screen. • Selectable AGC time constant (unit: seconds) Mode Default Selectable AGC time constant SSB 0.3 (FAST) 2.0 (MID) 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 6.0 (SLOW) CW/RTTY 0.1 (FAST) 0.5 (MID) 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 1.2 (SLOW) 3.0 (FAST) AM 5.0 (MID) 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 7.0 (SLOW) FM/WFM/DV 0.1 (FAST) Fixed 5-3 Touch [AGC] for 1 second • When AGC-M (MID) is selected Selected mode Selected AGC speed's time constant display • When AGC-F (FAST) is selected • When AGC-S (SLOW) is selected 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](D) for 1 second, and rotate the Dial to set the time constant to OFF.