Icom IC-7200 Instruction Manual - Page 50

5 FUNCTIONS FOR RECEIVE ■ Preamp and attenuator The preamp amplifies received signals in the receiver input (front end) circuit to improve the S/N ratio and sensitivity. Turn this function ON when receiving weak signals. The attenuator prevents very strong signals near the desired frequency, such as nearby broadcast stations or very strong amateur signals, from causing distortion of a desired signal. ➥ Push P.AMP ATT momentarily to turn the preamp ON and OFF; push and hold for 1 sec. to turn the attenuator ON. • " " appears when the preamp is ON; " " appears when the 20 dB attenuator is ON. • Only one of these functions can be activated at a time. Either " " or " " appears. MODE TS TUNER FILTER SPCH NB NR ANF METER V/M 1 1.8 A=/B 2 3.5 SPLIT 3 7 MW 4 10 M-CL 5 14 AGC 6 18 COMP271 . RIT GENE SCAN 8 24 MNF 0 50 VOX 9 28 F-INP ENT BAND P.AMP ATT M-CH/RIT SET momentarily momentarily 1 sec. : Push momentarily : Push and hold for 1 sec. ■ AGC function The AGC (auto gain control) controls receiver gain to produce a constant audio output level even when the received signal strength is varied by fading, etc. D AGC time constant selection q Push MODE several times to select the desired mode. w Push AGC once or twice to select AGC fast or AGC slow. • "F.AGC" appears for AGC fast; no indicator for AGC slow is selected, respectively. e Push and hold AGC for 1 sec. to turn the AGC OFF. • "AGC-OFF" appears for AGC OFF. MODE TS TUNER FILTER SPCH NB NR ANF METER V/M 1 1.8 A=/B 2 3.5 SPLIT 3 7 MW 4 10 M-CL 5 14 AGC 6 18 COMP271 . RIT GENE SCAN 8 24 MNF 0 50 VOX 9 28 F-INP ENT BAND P.AMP ATT M-CH/RIT SET 45