Icom IC-551D Instruction Manual page 24

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SSB OPERATION
1.
RECEIVING
After connecting an antenna, microphone, etc., set knobs and switches as follows.
POWER SWITCH OFF (button out position)
T/R SWITCH
©
|
RECEIVE
(UP)
VOX SWITCH | ОЕЕ (ОР)
АСС SWITCH
SLOW (ОР)
. NB (NOISE BLANKER) SWITCH OFF (UP)
MODE SELECT SWITCH USB or LSB
VFO SWITCH "А" or "В"
AF GAIN CONTROL Fully Counterclockwise
RF GAIN CONTROL Fully Clockwise
SOL CONTROL Fully Counterclockwise
DIAL LOCK SWITCH OFF (UP)
RIT CONTROL Center (12 o'clock) position
NB (NOISE BLANKER)
. nearby frequency or when there is continuous (not pulse type) noise.
AGC (AUTOMATIC GAIN CONTROL)
The IC-551D has а fast attack/slow release AGC system which holds the peak voltage of
rectified IF signals from the IF amp circuit for a certain period. Therefore, during the pauses
її normal speech of the received signal, uncomfortable noise will not be heard. The multi-
function meter indicates the peak value for a certain period, facilitating reading of the meter
"S" function. | |