Icom IC-77 Instruction Manual page 5

© MICROPHONE GAIN CONTROL [MIC] (p. 10)
Adjusts microphone input gain.
Recommended level
for the supplied
microphone MIC
Decreases ( ) Increases
© SCAN SWITCH [SCAN] (p. 6)
Starts and stops channel scan.
What is channel scan?
| Channel scan repeatedly scans all channels. |
@ RF POWER CONTROL [RF PWR] (p. 10)
Adjusts the RF output power from minimum to
maximum.
RF PWR
Decreases ( Q) Increases
Min. 5 W Max. 100 W*
*AM mode: Max. 25 W
@ LOCK SWITCH [LOCK] (p. 6)
Electronically locks the channel selector.
What is the lock function?
The lock function prevents accidental changing of the
channel.
@ CHANNEL SELECTOR (p. 6)
Selects a channel.
@ MODE SWITCH [MODE] (p. 6)
Selects an operating mode temporarily while fre-
quency is indicated.
Permitted mode
USB mode is commonly used for voice communication.
Other modes may be inhibited, since selectable mode
for receiving varies according to optional setting at your
Icom Dealer.
When the [PTT] switch is pushed, previous operating
mode is selected.
PANEL DESCRIPTION 1
@ FREQUENCY/COMMENT SWITCH [FC] (p. 6)
Selects frequency or comment (alphanumeric note)
indication on the function display.
®© PREAMP/ATTENUATOR SWITCH
[PREAMP/ATT] (p. 8)
— Turns the 10 dB preamp ON and OFF.
— Turns the 20 dB attenuator ON and OFF.
What is the preamp?
| The preamp amplifies a desired weak signal. |
What is the attenuator?
The attenuator prevents a desired signal from distort-
ing under the following conditions:
— When very strong signals are near the desired fre-
quency.
— When very strong stations are near your location.
@ RIT SWITCH [RIT] (p. 8)
Turns the RIT function ON and OFF.
@ RIT CONTROL [RIT] (p. 8)
Shifts the receive frequency while the RIT function
is ON.
+0 kHz
RIT
Decreases ( ) Increases
— 1.2 kHz +1.2 kHz
What is the RIT function?
The RIT control shifts the receiving frequency to ob-
tain clear audio for an off-frequency signal.
RIT stands for Receiver Incremental Tuning.