Icom IC-22S PLL Synthesized 2-Meter Transceiver
Instruction Manual and Service Notes
8
SECTION V.
Operation
Initial Preparations
Connect the microphone to the microphone jack.
Connect the antenna to the antenna coax connector. Make sure the coax line is of the correct
impedance (50 ohms) and is neither shorted nor open.
Make sure the function switch is in the off position, then connect the power supply cord to the
power supply jack. The red lead should be connected to the positive side of the power source and
the black lead to the negative side. In the event that these leads are improperly connected, the
transceiver will not function. No damage will be, however, incurred since protection is provided in
the P.A. for this purpose.
Turn the volume and squelch controls to the maximum counter-clockwise position.
Operation
When the function switch is set to either the high or low position the set is switched on and the
channel indicator window and meter will be illuminated.
Switch the channel selector to the desired channel.
Choose the proper DPX offset setting, or SPX for simplex operation.
Reception
Adjust the volume control to a comfortable listening level of noise, if no signal is present.
Carefully adjust the squelch control clockwise until the noise just disappears. This is the proper
squelch threshold setting and must be done when no signal is present. Your transceiver will now
remain silent until an in-coming signal is received which opens the squelch. If the squelch is
unstable due to the reception of weak or stations, adjust the squelch control further until the
proper threshold is obtained.
The S meter indicates the signal strength of the incoming stations and is calibrated in S units. and
db over S9. The light illuminating the meter acts also as lock indicator for the PCC.
Transmitting
Push the PTT (push to talk) button on the microphone and the transceiver will transmit. At the
same time the TX indicator will be illuminated red and the meter will provide an indication of
relative power output of the transmitter. The pointer will be on or near the red mark on the meter
scale when on high power and just a little over 1 on low power. Hold the microphone about three
inches from your mouth and speak in a normal voice. The microphone is of the dynamic type and
provides good pickup for all levels of voice.
To receive again, just release the PTT button. This will also switch off the light.
