Icom IC-RSOOCOL Instruction Manual page 38

6 BASIC OPERATION
6-3 RECEIVING
(IF SHIFT)
Center position
The spectrum scope
screen is helpful for
signal checking. (p. 18)
[AGc]
Set [SLOW] or [FAST]
([METER]
[CENTER] can be used
in FM or WFM. (p. 36)
[NOTCH]
OFF
(p.37)
1 sss.
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1999600.
[NOISE BLANKER]
OFF
(p. 38)
[ATT 10 dB] [ATT 20 dB)
Prevents the RF amplifier from
distortion when excessively
strong signals are received.
(RF GAIN]
Varies the RF amplifier gain.
This control is especially useful
when [AGC] is OFF.
Activates in FM or
WFM only. (p. 35)
1) Set switches and controls as described in Section 6 - 1.
2) Push a [MODE] switch to set the operating mode.
«See MODE SELECTION at right (on p, 36),
(MODE] [FILTER WIDTH]
[AF GAIN] [SQUELCH]
3) Set the [SQUELCH] control to max. counterclockwise.
i 4) Adjust the [AF GAIN] control to the desired audio level.
@ ||
© 5) Set the desired receive frequency using the keyboard and
the main dial. See Section 6 - 2 for details. ;
When a signal is received, the meter shows the relative
signal strength,
aoagal|
[MAIN DIAL] [KEYBOARD]
6) Select a filter width, wide, middle or narrow.
See FILTER SELECTION at right (on p. 36).
7) Rotate the [SQUELCH] control clockwise if you want
to mute the audio noise.
Tech Talk from Icom
Q. What is AFC?
A. AFC means Automatic Frequency Control. The The AFC circuit in the IC-R9OOOL detects the output
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.
voltage from the discriminator circuit and applies
the voltage to the CPU to change N-data for the
PLL circuit. N-data will be changed until the center
frequency is received.
Therefore, the operating frequency of the IC-R9000L
is automatically adjusted to the center of a receive
frequency by the AFC circuit.