Selecting The Preamp And Attenuator; Agc Function; Dagc Time Constant Selection - Icom IC-7200 Advanced Instructions

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5
FUNCTIONS FOR RECEIVE

■ Selecting the preamp and attenuator

The preamp amplifies received signals in the receiver
input (front end) circuit to improve the S/N ratio and
sensitivity. Turn this function ON when receiving weak
signals.
The attenuator prevents very strong signals near the
desired frequency, such as nearby broadcast stations
or very strong amateur signals, from causing distor-
tion of a desired signal.
P.AMP
➥ Push to turn the preamp ON or OFF; hold
ATT
down for 1 second to turn the attenuator ON.
• " " appears when the preamp is ON.
P.AMP
➥ Hold down
ATT
tenuator. Push
• " " appears when the 20 dB attenuator is ON.
NOTE: Only one of these functions can be acti-
vated at a time.

■ AGC function

The AGC (automatic gain control) controls receiver
gain to produce a constant audio output level, even
when the received signal strength varies due to fading,
and so on.
D AGC time constant selection
Push MODE
q
mode.
Push AGC once or twice to select AGC fast or
w
AGC slow.
• "F.AGC" appears when AGC fast is selected, and no
icon appears when AGC slow is selected.
Hold down
e AGC
OFF.
• "AGC-OFF" appears when AGC OFF is selected.
for 1 second to turn ON the at-
P.AMP
turn OFF the attenuator.
ATT
several times to select the desired
for 1 second to turn the AGC
P.AMP : ON
ATT : OFF
Push
: Push
: Hold down
5-3
Either " " or
" " appears.
Push
P.AMP : OFF
ATT : OFF
Hold down
for 1 second.
P.AMP : OFF
ATT : ON
.
for 1 second.