Section Iv - Control Functions; Front Control - Icom IC-201 Instruction Manual

SECTION IV - CONTROL FUNCTIONS
4.1 FRONT CONTROL
(1) Function Switch: The Xtal A, В, С & D are for extra crystals. In the EXT position,
the output frequency is controlled by another VFO connected to the accessary
9 pin-socket. VFO position is the Main VFO. |
(2) Power Switch: for AC and DC.
(3) T-R Switch: T for Transmit and R for Receive.
(4) SQL Control: Adjusts squelch threshold.
(5) CAL: For calibration.
(6) VOL: Controls audio volume.
(7) MIC Gain: For adjusting modulation level.
(8) RIT: For adjusting the receive frequency about +4KHz.
(9) COURSE: 144 position is for 144 to 145 MHz, 145 position is for 145 to 146MHz.
The Duplx position, is for repeater use.
(10) Center Meter: Indicates the error against the receive frequency for FM.
(11) Tuning Knob: 1MHz is covered by a special dual speed system. One revolution of
the knob covers 50KHz or 16KHz, depending on the speed.
(12) Tuning Speed Ratio Selector: For selecting speed ratio.
(13) Dial Plate Disengage Knob: Dial calibration can be fixed by turning to the left.
(14) Indication Lamps: RED for Transmit and GREEN for Receive.
(15) RF GAIN: For adjusting coupling ratio of Helical Cavity attenuator.
(16) Tuning Dial: When the indication of the dial slips off with the actual frequency,
the red indicator on the right or left slightly by the knob after removing in the cou-
nter clockwise direction. If the knob is removed, it must be replaced after the
adjustment.
(17) Mode Switch: For selection of either FM, USB, LSB and CW modes.
(18) Meter: In the S & RF positions, the meter indicates the strength of an input signal
in receive and the output power in transmit. As to the standing wave ratio, after
the meter indicator is adjusted to the SET position on the meter by the SWR Set
located inside (see Fig. VI), you can read the standing wave ratio on the meter by
switching the SWR Switch to the SWR oe
(19) Noise Blanking Switch:
(20) VOX Switch: For voice control and су keying control.
(21) Head Phone Jack: Connects headset here.
(22) MIC Socket: A 500 ohm microphone with push to talk switch is connected.
(23) ACC Socket: For connecting accessaries (see Fig. Ш)
PinNo:| Connection — |
Regulated DC 9V
DC 13.8V
External Control
AF detector output has no connection with AF
Volume
Modulator input
External VFO
Ground
VFO and fixed channels OSC output
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