Setting The Speech Compressor (Ssb Only); Setting The Transmit Filter Width (Ssb Only) - Icom IC-7851 Instruction Manual

8
FUNCTIONS FOR TRANSMIT

■ Setting the speech compressor (SSB only)

The speech compressor increases average RF output
power, improving readability at the receiving station, in
only the SSB mode.
q
Push the Mode key [SSB]
mode.
w
Push the Multi function [METER](
times to select the ALC meter.
e
Rotate [MIC] to adjust the microphone gain to a suit-
able level.
r
Push the Multi function [COMP](
The Speech compressor is turned ON.
e Push [METER]() several times to select the COMP
meter.
r While speaking into the microphone at your normal
voice level, rotate the [COMP] control, so that the
COMP meter reads within the COMP zone (10 to
20 dB range), as shown to the right.
When the COMP meter peaks exceed the COMP
zone, your transmitted voice may be distorted.
t Push [METER]() several times to select the ALC
meter.
y While speaking into the microphone at your normal
voice level, rotate the [DRIVE] control, so that the
ALC meter reads within the 30 to 50% range of the
ALC zone, as shown to the right.
✔ For your convenience
Hold down [METER]() for 1 second to display the
multi-function meter to check the ALC and COMP level
at a glance.
■ Setting the transmit filter width (SSB only)
The transmit filter width for SSB mode can be selected
from wide, mid and narrow.
➥ Operating in the SSB mode, hold down [COMP]()
for 1 second several times to set the desired transmit
filter width to Wide, Mid, or Narrow.
• The filter functions regardless of the speech compres-
sor use.
• The following filters are specified as the default. Each of the
filter width can be reset in the Level set mode.
WIDE: 100 Hz ~ 2.9 kHz
MID: 300 Hz ~ 2.7 kHz
NAR: 500 Hz ~ 2.5 kHz
to select the USB or LSB
) key several
) key.
(p. 15-5)
() Multi function keys
[MIC]
Mode keys [COMP]
1
S
0
I
D
0
Po
SWR
COMP
Drive gain range
1
S
0
I
D
0
Po
SWR
COMP

( ) Multi function keys
Mode keys
• Level set screen
8-6
[DRIVE]
COMP zone
9 +
20
5
+
40
+
60dB
5
10
50 100 150
15
200
10 A
250
2
3
W
1.5
20
10
1
0
dB
ALC 44 52V V
D
9 +
20
5
+
40
+
60dB
5
10
50 100 150
15
200
10 A
250
2
3
W
1.5
20
10
1
0
dB
ALC 44 52V V
D