Icom IC-211 Instruction Manual page 20

SSB OPERATION
1. RECEIVING
After connecting an antenna, microphone, etc., set knobs and switches as follows.
POWER SWITCH OFF
T/R SWITCH RECEIVE (UP)
VOX SWITCH OFF (UP)
AGC SWITCH SLOW (UP)
NB (NOISE BLANKER) SWITCH OFF (UP)
MODE SELECT SWITCH USB or LSB
VFO SWITCH "А", "B" ог "SIM"
AF GAIN CONTROL Completely Counter-clockwise
RF GAIN CONTROL Completely Clockwise
RIT CONTROL Center (12 o'clock) position
The other knobs are unrelated to receiving and need not be set at this time.
In SSB operation there is both a USB (upper side band) and an LSB (lower side band).
USB is usually used on the band, while LSB is usually used on the downlink of the
satellite communications. Select the mode according to your use.
Now turn ON the power switch. The meter lamp will be illuminated and "144.000.0"
will be shown on the LED readout. Slowly turn the AF gain control clockwise to a
comfortable level. Rotate the tuning knob until a signal is received. The multi-function
meter needle will move according to the signal strength, so tune for the highest possible
meter reading and the clearest audio. If you cannot get a clear signal, you may be receiv-
ing in the opposite sideband. If so, change the mode switch to the proper sideband.
The VFOs in the IC-211 change in 100Hz steps. Therefore the maximum possible
difference in your receiving frequency and the received signal frequency is 50Hz.
However, for normal voice signal reception, a difference of 50Hz is negligible and indeed
may be hard to distinguish. Since the frequency is changed in 100Hz steps with the
IC-211, as opposed to continuous variable frequency systems, tuning is simplified and
more accurate.
NB (NOISE BLANKER)
Turn the noise blanker ON (down) when there is pulse type noise, such as ignition noise
from automobile motors. Noise will be suppressed and even weak signals will be received
comfortably. The noise blanker may not work as effectively when there is a strong
signal on a nearby frequency or when there is continuous (not pulse type) noise.
AGC (AUTOMATIC GAIN CONTROL)
The IC-211 has a "hang" AGC system which holds the peak voltage of rectified AF
signals from the detector circuit for a certain period. Therefore, during the pauses in
normal speech of the received signal, uncomfortable noises will not be heard. The
multi-function meter indicates the peak value for a certain period, facilitating reading of
the meter "S" function.
E Ones