I Rit Function; I If Shift Function - Icom IC-910H Instruction Manual

I RIT function

The RIT (Receive Incremental Tuning) function com-
pensates for off-frequencies of the communicating sta-
tion without moving the transmit frequency.
The RIT function can be used for the MAIN band only.
The function affects the MAIN band even when ac-
cessing the SUB band.
q Push [RIT] to turn the RIT function ON.
• "RIT" indicator appears.
w Rotate [RIT] control to cancel the off-frequencies.
• Rotate [RIT] control to the center position, after commu-
nication.
e Push [RIT] to cancel the RIT function.
• "RIT" indicator disappears.

I 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 fre-
quency up to ±1.2 kHz in 100 Hz steps in SSB/CW
mode. The IF shift is especially useful in SSB opera-
tion and not available in FM mode.
The IF shift function can be used for the SUB band
using the SUB tuning dial function (p. 24)
◊ MAIN band IF shift operation
q Set the [SHIFT] control to its center position when
there is no interference.
w Rotate the [SHIFT] control to adjust for minimum in-
terference signal level.
• The audio tone may change while the IF shift is in use.
Max. counter- Center position
clockwise position
[RIT] switch
[RIT] control
Max. clockwise
position
From The N3UJJ.COM Document Library From The N3UJJ.COM Document Library
RECEIVE AND TRANSMIT
◊ RIT variable range
SSB/CW mode : ±1.0 kHz in 10 Hz steps (±2.0 kHz for
optional 1200 MHz band)
FM mode : ±5.0 kHz in 50 Hz steps (±10.0 kHz
for optional 1200 MHz band)
FM mode
FM
RIT variable range is displayed for 2 sec.
and then returns to frequency indication.
SSB mode
USB USB
RIT variable range is displayed for 2 sec.
and then returns to frequency indication.
◊ SUB band IF shift operation
q Assign the SUB band IF shift function to either [RIT]
or [SHIFT] control using the RIT/SHIFT set mode
(p. 68).
w Push [RIT] for 1 sec. to turn the SUB tuning dial
function ON.
• "RIT" indicator flashes.
e Rotate [RIT] or [SHIFT] control for a minimum inter-
ference signal level.
r Push [RIT] to cancel the SUB tuning dial function.
• "RIT" indicator disappears.
• Set [RIT] or [SHIFT] control to the center position after
the communication.
In satellite operation mode, the SUB tuning dial
function cannot be activated. Therefore, the [SHIFT]
control acts as an IF shift for the receive band (dis-
played in the upper area).
5
RIT RIT
RIT RIT
27