Icom IC-7600, Instruction Manual, Page: 11 / 196

y
MICROPHONE CONNECTOR [MIC]
Accepts the supplied or an optional microphone.
• See page 171 for appropriate microphones.
• See page 24 for microphone connector
information.
u
MIC GAIN CONTROL [MIC GAIN] (p. 40)
Adjusts the microphone gain.
• The transmit audio tone in the SSB, AM and FM modes
can be adjusted independently in the level set mode.
(p. 128)
How to set the microphone gain.
✓
Set the [MIC GAIN] control so that the ALC meter
swings within the ALC range during normal voice
level transmission, in the SSB or AM modes. (The
ALC meter must be selected.)
MIC GAIN
Recommended level for
an Icom microphone
Increases
Decreases Push
i
AF CONTROL [AF] (inner control; p. 38)
Varies the audio output level of the speaker or
headphones.
Increases
Decreases
o
RF POWER CONTROL [RF POWER] (p. 40)
Continuously varies the RF output power from a
minimum of
2 W*
to a maximum of
100 W*
.
*AM mode: 1 W to 30 W
Increases
max. 100 W
(30 W for AM)
Decreases
min. 2 W
(1 W for AM)
Push
!0
RF GAIN CONTROL/SQUELCH CONTROL
[RF/SQL] (outer control; p. 37)
Adjusts the RF gain and squelch threshold level.
The squelch removes noise output from the speaker
(closed condition) when no signal is received.
• The squelch is particularly effective for FM. It is also
available for other modes.
• The 12 to 1 o’clock position is recommended for the
most effective use of the [RF/SQL] control.
• The control can be set as ‘Auto’ (RF gain control in
SSB, CW, RTTY and PSK. Squelch control in AM and
FM) or squelch control (RF gain is fixed at maximum) in
the set mode as follows. (p. 136)
MODE
SET MODE SETTING
AUTO SQL RF GAIN + SQL
SSB, CW
RTTY/PSK
RF GAIN SQL RF GAIN + SQL
AM, FM SQL SQL RF GAIN + SQL
• When setting as an RF gain/squelch control
Maximum
RF gain
S-meter
squelch
Noise squelch (FM mode)
Squelch is
open.
RF gain
adjustable
range
Recommended level
• When functioning as an RF gain control
(Squelch is fixed open; SSB, CW, RTTY and PSK only)
Minimum RF gain
Adjustable
range
Maximum
RF gain
• When functioning as a squelch control
(RF gain is fixed at maximum.)
Squelch is
open.
S-meter
squelch
S-meter squelch
threshold
Noise squelch
threshold
(FM mode)
Shallow Deep
Noise squelch (FM mode)
While rotating the RF gain control, noise may be
heard. This comes from the DSP unit and does not
indicate an equipment malfunction.
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