Icom IC-R9000L [38/72] Tech talk from loom

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6 BASIC OPERATION 6 3 RECEIVING METER CENTER can be used in FMorWFM p 36 AGC Set SLOW or FAST p 38 IF S Center p The spectrum scope screen is helpful for signal checking p 18 S El ara л NOISE BLANKER OFF p 38 а в_и д Ё Э1ЕЭ СД ЕД _ви RF GAIN Varies the RF amplifier gain This control is especially useful when AGC is OFF ATT 10 dB ATT 20 dB Prevents the RF amplifier from distortion when excessively strong signals are received AFC Activates in FM or WFM only p 35 1 Set switches and controls as describe 2 Push a MODE switch to set the opera See MODE SELECTION at right on 3 Set the SQUELCH control to max co 4 Adjust the AF GAIN control to the des 5 Set the desired receive frequency usin the main dial See Section 6 2 for de When a signal is received the meter signal strength 6 Select a filter width wide middle or na See FILTER SELECTION at right on 7 Rotate the SQUELCH control clockw to mute the audio noise Tech Talk from loom Q What is AFC A AFC means Automatic Frequency Control The AFC circuit automatically compensates for a fre quency when a receive frequency drifts or goes off frequency When the receiver receives an off frequency from the center of an FM signal the received audio signals are distorted The discriminator circuit outputs voltage which is different when the center frequency is received 35 The AFC circuit in the IC R9000L d voltage from the discriminator cir the voltage to the CPU to chang PLL circuit N data will be changed frequency is received Therefore the operating frequency is automatically adjusted to the ce frequency by the AFC circuit

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