Icom IC-251A Instruction Manual page 17

HOW TO TUNE
The following instructions are for tuning in any mode. Please read carefully and understand fully
before turning ON your unit. Proper tuning is necessary for optimum operation.
PRESET FREQUENCIES
When the POWER switch is turned ON, the frequency display will be 145.000.0 representing
145.000.0MHz, when the VFO/Memory Switch is in the ""A'', "RA-TB", "MS", 1", "[2]"" and
"(3)" positions, and the display will show 145.600.0 representing 145.600.0MHz, the switch is in
the "B" and ""RB-TA" positions. The frequencies of the VFOs and the Memory Channels are
preset so that they start from the frequencies shown above whenever the !C-251A/E is turned ON
with the MEMORY Switch in the OFF position or whenever the power to the CPU is cut for even
a short time. Turn the VFO/Memory Switch to the ''A"' position.
FREQUENCY DISPLAY ON EACH MODE
Turn the MODE Select Switch to "FM", to "USB", to "LSB", and to "CW''. The displayed
frequency will be changed as follows.
At the "FM" position
At the "USB" position
At the "'LSB" position
At the "CW" position
To avoid the trouble of recalibrating the dial when you change the operating mode, the displayed
frequency is set to shift to the carrier frequency of each mode automatically. For the differences
of the frequency shifts of the various modes, refer to the following figure.
The differences of the frequency
of the various modes
NOTE: At some operating frequencies, when changing the operating mode, the frequency display
may indicate a frequency which is out of the operating range of the IC-251A/E. If this
happens, rotate the Tuning Control either clockwise or counterclockwise by at least one
small vernier mark on the Knob. Do not set the IC-251A/E in the transmit mode, before
following this procedure.
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