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5
FUNCTIONS FOR RECEIVE
2001 NEW 2001 NEW
Preamp/Attenuator
The preamp amplies received signals in the front end
circuit to improve the S/N ratio and sensitivity. Set this
to preamp 1 or preamp 2 when receiving weak signals.
The attenuator prevents a desired signal from distor-
tion when very strong signals are near the desired fre-
quency or when very strong electric fields, such as
from broadcasting stations, are near your location.
These can both set independently for each band.
Push [P.AMP/ATT] several times to set the preamp
OFF, preamp 1 ON or preamp 2 ON.
When the preamp is ON, either P.AMP 1 or
P.AMP 2 appears in the function display.
When operating on the 144 MHz band, the preamp can
only be set to ON or OFF only there is no preamp 1
and preamp 2.
Push [P.AMP/ATT] for 1 sec. to set the attenuator ON.
ATT appears in the display when the function is set ON.
Push [P.AMP/ATT] momentarily to set the attenuator OFF.
RIT function
The RIT (Receive Increment Tuning) function compen-
sates for off-frequencies of the communicating station.
The function shifts the receive frequency up to
±9.99 kHz in 10 Hz steps without moving the transmit
frequency.
See #0 on p. 4 for function description.
q Push [RIT] to turn the RIT function ON and OFF.
•“RIT and the shifting frequency appear when the func-
tion is ON.
w Rotate the [RIT/TX] control.
Push [CLEAR] for 1 sec. to reset the RIT frequency.
Push [CLEAR] momentarily to reset the RIT frequency
when the quick RIT clear function is ON. (p. 86)
Push [RIT] for 1 sec. to add the shift frequency to the op-
erating frequency.
DD
RIT monitor function
When the RIT function is ON, pushing and holding
[XFC] allows you to monitor the operating frequency
directly (RIT is temporarily cancelled).
[P.AMP/ATT]
Push
P.AMP/ATT
Push
P.AMP/ATT
Push
P.AMP/ATT
Push for 1sec.
P.AMP/ATT
Push
P.AMP/ATT
Regular preamp, the most effective for 1.8 to
21 MHz bands without IMD corruption.
High-gain preamp, the most effective for 24
to 50 MHz bands.
Preamp activates for the VHF band
(144 to
146 MHz range; 108 to 174 for the USA version)
.
[RIT]
[CLEAR]
[RIT/TX] control
Appears
Regarding the use of the P.AMP 2
The P.AMP 2 is a high gain receive amplier. When the
P.AMP 2 is used during times of strong electric elds, dis-
tortion sometimes results. In such cases, use the trans-
ceiver with the P.AMP 1 or P.AMP OFF setting.
The P.AMP 2 is most effective when:
Used on bands above 24 MHz and when electric elds are
weak.
Receive sensitivity is insufcient during low gain, or while
using a narrow band antenna
(such as small loop, a Bever-
age antenna or a short Yagi antenna, etc.) is used.
IC-7400.qxd 02.4.2 11:35 Page 47
60


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