Icom IC-751A Instruction Manual page 40

7 -8 NOTCH FILTER OPERATION
RIT/ LITX RIT
NOTCH
CONTROL
NOTCH
SWITCH
7 - 9 Fil TER SWITCH OPERATION
RIT/ LITX RIT •
ICJI
LITX
ICJI
0
CLIIII
PST% NOTCH
I l Il
0~
7 -10 RIT/L1TX OPERATION
•RIT OPERATION
FIL TER
SWITCH
1) Push RIT SWITCH to turn ON the RIT.
Receive : 14.267.SMHz
Transmit: 14.267.SMHz
"RIT" displays.
use
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I I. L LI I. LI
VFOA
1
"
RIT
IÎ IÎ IÎ
LI. LI LI
This circuit provides high attenuation atone particular frequency in
the IF passband. lt may be used to reduce or eliminate interfering
heterodyne signais that fall within the passband of the receiver.
1) Push the NOTCH FIL TER SWITCH to the ON position {IN).
2) Adjust the NOTCH FIL TER CONTROL to minimize inter-
ference.
NOTCH FILTER CHARACTERISTIC
This switch selects the different combinations of the internai receive
filters.
FIL TER
*1
SSB CW/RTTY
CW/RTTY
AM FM
SWITCH
NARROW
*2
*4
OUT
2.3kHz
500Hz 500/250Hz 8kHz 15kHz
*3
*5
IN 2.6kHz 2.3kHz
500/250Hz
3kHz 15kHz
*1:
CW NAR ROW or RTTY NAR ROW mode requires either an
optonal FL-52A or FL-53A narrow filter.
*2, *3: Internai preset switch S4 on the MAIN unit reverses these
narrow and wide filters:
Fil TER SWITCH OUT: 2.3kHz
FIL TER SWITCH IN : 500Hz
*4, *5: Internai preset switch S3 on the MAIN unit reverses these
wide and narrow filters:
Fil TER SWITCH OUT: 3kHz
FIL TER SWITCH IN : 8kHz
By using the RIT circuit, it is possible to shift the receive frequency
up to 9.9kHz to either side of the transmit frequency without mov-
ing the transmit frequency. This is. useful for fine tuning stations
which call off frequency or for compensating for frequency drift.
1) Push the RIT SWITCH once to turn the RIT circuit ON. The
letters "RIT" and the amount of shift are displayed.
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