Icom IC-251A Instruction Manual page 9

SECTION IV CONTROL FUNCTIONS
FRONT PANEL
@)MULTI-FUNCTION METER @) TRANSMIT INDICATOR LED
@RF POWER CONTROL
(MIC GAIN CONTROL
@)TUNING SPEED INDICATOR LED
@MRECEIVE INDICATOR LED
25 FREQUENCY
©) MIC CONNECTOR
(2MS/MW BUTTON
(4@)PHONES JACK @)TUNING CONTROL KNOB
(®TUNING SPEED and
TONE CALL BUTTON
(MDIAL LOCK SWITCH
(AGC SWITCH
(3)POWER SWITCH
@AF GAIN CONTROL
@)MODE SELECT SWITCH
®RF GAIN CONTROL
- (®VOX SWITCH
(@NOISE BLANKER SWITCH
(DV FO/MEMORY SWITCH
()RIT CONTROL
() TRANSMIT/RECEIVE SWITCH
(2RIT SWITCH
1. MIC GAIN CONTROL
Adjusts the level of modulation according to the input of the microphone. As the input will
vary with different microphones and different voices, adjust for the proper modulation
accordingly. Clockwise rotation increases mic gain.
2. RF POWER CONTROL
The 1C-251A/E has an output power of 1~10 watts which can be varied by the RF Power
control. Turning the control clockwise will increase power, while turning counterclockwise
will decrease it. (FM only)
3. POWER SWITCH
A push lock type ON/OFF switch controls the supplied power, either AC or DC, to the set.
Push the switch IN (lock position) to apply power to the set. Push again to unlock the switch
to remove power from the set. (In the unlocked position, power for the memory circuit will
remain if the memory switch @3 is in the ON (up) position. (See page 12.)
4. PHONES JACK
Accepts a standard 1/4-inch headphone plug for a 4~16 ohm headphone set. Stereo head-
phones can be used without modification.