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u MICROPHONE CONNECTOR [MIC]
Accepts an optional microphone.
• See p. 15-4 for appropriate microphones.
• See p. 2-10 for microphone connector information.
i MIC GAIN CONTROL [MIC] (p. 3-12)
Adjusts microphone input gain.
• The transmit audio tone in SSB, AM and FM modes can
be adjusted independently in set mode. (p. 12-5)
✔
How to set the microphone gain.
Set the [MIC] control so that the ALC meter occasionally
moves up-scale during normal voice transmission in SSB,
AM or FM mode.
o VOX SWITCH
➥ Push to turn the VOX function ON and OFF dur-
ing SSB, AM and FM mode operation. (p. 6-2)
➥ Push and hold for 1 sec. to enter VOX set mode.
(p. 6-2)
✔
What is the VOX function?
The VOX function (voice operated transmission) activates
transmission without pushing the transmit switch or PTT
switch when you speak into the microphone; then auto-
matically returns to receive when you stop speaking.
!0 RF POWER CONTROL [RF PWR] (p. 3-12)
Continuously varies the RF output power from min-
imum (5 W*) to maximum (200 W*).
*AM mode: 5 W to 50 W
!1 BREAK-IN SWITCH
Push to turn the break-in function ON (semi-break-in,
full-break-in)
and OFF during CW mode operation.
(p. 6-3)
✔
What is the break-in function?
The break-in function switches transmit and receive with
CW keying. Full break-in (QSK) can monitor the receive
signal between CW dots and dashes.
!2 ELECTRONIC CW KEYER SPEED CONTROL
[KEY SPEED] (p. 4-4)
Adjusts the internal electronic CW keyer’s speed.
•6 wpm (min.) to 48 wpm (max.) is the available range.
!3 MONITOR SWITCH (p. 6-4)
Monitors your transmitted IF signal.
• The CW sidetone functions regardless of
switch setting in CW mode.
• The [MONITOR] indicator above this switch lights green
while the function is activated.
!4 BREAK-IN DELAY CONTROL [DELAY] (p. 6-3)
Adjusts the transmit-to-receive switching delay time
for CW semi-break-in operations.
!5 AGC CONTROL [AGC] (p. 5-11)
Adjusts the continuously-variable AGC circuit time
constant.
•To use [AGC] control, push ([AGC VR] indi-
cator lights).
!6 SQUELCH CONTROL [SQL]
(outer control; p. 3-9)
Adjusts the squelch threshold level. The squelch
mutes noise output from the speaker (closed condi-
tion) when no signal is received.
• The squelch is particularly effective for FM. It is also
available in other modes.
• The 11 to 12 o’clock position is recommended for the
most effective use of the [SQL] control.
AGC VR
MONITOR
MONITOR
BK-IN
VOX
Deep
Deep
Noise squelch
Squelch
threshold
Shallow
Shallow
S-meter
squelch
Squelch is
open
Slow
Fast
Long delay for
slow speed keying
Short delay for
high speed keying
Max.
48 wpm
Min.
6 wpm
Increases
Decreases
Recommended level for
an Icom microphone
Decreases
Decreases
Increases
Increases
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PANEL DESCRIPTION