Preamp And Attenuator; Agc Function; D Agc Time Constant Selection - Icom IC-7200 Instruction Manual

5
FUNCTIONS FOR RECEIVE

■ Preamp and attenuator

The preamp amplifies received signals in the re-
ceiver input (front end) circuit to improve the S/N
ratio and sensitivity. Turn this function ON when re-
ceiving weak signals.
The attenuator prevents very strong signals near the
desired frequency, such as nearby broadcast sta-
tions or very strong amateur signals, from causing
distortion of a desired signal.
P.AMP
➥ Push momentarily to turn the preamp ON
ATT
and OFF; push and hold for 1 sec. to turn the
attenuator ON.
• " " appears when the preamp is ON; "
appears when the 20 dB attenuator is ON.
• Only one of these functions can be activated at a time.

■ AGC function

The AGC (auto gain control) controls receiver gain to
produce a constant audio output level even when the
received signal strength is varied by fading, etc.

D AGC time constant selection

q Push
MODE
mode.
w Push once or twice to select AGC fast or
AGC
AGC slow.
• "F.AGC" appears for AGC fast; no indicator for AGC
slow is selected, respectively.
e Push and hold
OFF.
• "AGC-OFF" appears for AGC OFF.
45
once or twice to select the desired
for 1 sec. to turn the AGC
AGC
"
momentarily
: Push
: Push and hold
Either " " or
" " appears.
NB NR ANF
METER
V/M 1 A/B 2
SPLIT
= 3.5
1.8
4 5
MW M-CL AGC
10 14
7 8
COMP SCAN VOX
21 24
.
MODE TS
0
F-INP ENT
RIT MNF
GENE 50
BAND
TUNER FILTER
P.AMP
ATT
M-CH/RIT
SPCH
SET
momentarily
1 sec.
momentarily
for 1 sec.
ANF
NB NR
METER
2
V/M 1 A/B
SPLIT
1.8 = 3.5
4 5
MW
M-CL AGC
10 14
7 8
COMP SCAN VOX
21 24
.
MODE TS
0 F-INP ENT
RIT MNF
GENE 50
BAND
TUNER FILTER
P.AMP
ATT
M-CH/RIT
SPCH
SET
3
7
6
18
9
28
3
7
6
18
9
28