Icom IC-821H Instruction Manual page 25

© IF shift function
The IF shift function electronically changes 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 100 Hz steps in
SSB/CW mode. The IF shift is especially effective in
SSB operation and not available in FM mode.
The IF shift function can be used for the sub band
using the sub tuning dial function. (p. 20)
e Main band IF shift operation
@ Adjust the [SHIFT] control for a minimum inter-
ference signal level.
- The audio tone may change while the IF shift is in
use.
®© Set the [SHIFT] control to its center position
when there is no interference.
e Sub band IF shift operation
@) Assign the sub band IF shift function to the [RIT]
or [SHIFT] control using set mode with [RIT].
(2) Push [RIT] for 2 sec. to activate the sub tuning
dial function.
(3) Adjust the [RIT] or [SHIFT] control for a minimum
interference signal level.
(@) Push [RIT] to cancel the sub tuning dial function.
- Set the [SHIFT] control to center when [SHIFT] is
used.
© Noise blanker
When operating SSB or CW mode, pulse-type noise
may be received, such as from car ignitions. In this
case, the noise blanker eliminates such noise.
The noise blanker is effective on both bands but
cannot be used for FM, or non-pulse-type noise.
e Push [NB] to toggle the noise blanker ON and
OFF.
- The noise blanker turns ON or OFF for both bands
simultaneously.
NOTE: When using the noise blanker, received
signals may be distorted if they are excessively
strong.
'7
RECEIVE AND TRANSMIT 4
RIT-® SHIFT RIT- SHIFT RIT -SHIFT
Shifts to low Shifts to high
he IF shift function can be used in both bands
when the sub IF shift is assigned to the [RIT]
control for the sub tuning dial function. (p. 20)
When rotating the [SHIFT] control, especially in
CW mode, a mechanical sound may be heard.
Don't be alarmed, this is normal and is not a
transceiver malfunction.
RCRA
22