Icom IC-78 Instruction Manual page 22

3
OPERATION
D
Meter peak hold
The meter peak hold function freezes the highest dis-
played bar segment in any meter function for about
0.5 seconds so that you can more easily read the
meter. This function can be turned ON or OFF in the
Initial Set mode.
D
IF shift function
The IF shift function electronically narrows the pass-
band frequency of the IF (intermediate frequency)
and cuts out higher or lower frequency components
of the IF to reject interference. The function shifts the
IF frequency up to ±1.2 kHz in SSB/CW/RTTY modes
and up ±250 Hz in CW-narrow/RTTY narrow modes.
The IF shift is not available in AM mode.
Both controls at
center position
SHIFT
IF center frequency
19
(p. 30)
Interference
IF SHIFT OPERATION EXAMPLE
• Adjust the [SHIFT] control for a minimum interfer-
ence signal level.
• When IF shift is used, the audio tone may be
changed.
• Set the IF shift control to its center position when
there is no interference.
Cutting a lower
passband
SHIFT
Passband
Desired signal
Initial reception of a signal
results in an S-meter reading
of 40 dB.
The highest indicated bar
remains displayed for 0.5 sec.
even when the signal strength
decreases.
Cutting higher
passbands
SHIFT
Passband
Interference
Desired signal