Icom IC-7300, Основное руководство

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4
RECEIVING AND TRANSMITTING
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4-1
Preamplifiers
The preamps amplify received signals in the receiver
front end to improve the signal-to-noise ratio and
sensitivity. A preamp is used when receiving weak
signals.
L
EachbandmemorizesthePreamplifiersetting.
Push
P.AMP
ATT
(P.AMP).
L
Each push changes between “P.AMP1,” “P.AMP2,” and
OFF (no icon).
Displayed when the preamp is used.
(Example: P.AMP1)
P.AMP1
Widedynamicrangepreamplifier.
It is most effective for the HF low bands.
P.AMP2
High-gainpreamplifier.
It is most effective for the 50 MHz bands.
NOTE : When you use the preamp while receiving
strong signals, the receiving signal may be distorted.
In such case, turn OFF the preamp.
Attenuator
The Attenuator prevents a desired signal from
becoming distorted when a very strong signal is near
thefrequency,orwhenaverystrongelectricfield,
such as from a broadcasting station, is near your
location.
L
Each band memorizes the Attenuator setting.
Hold down
P.AMP
ATT
(ATT) for 1 second to turn ON the
Attenuator.
L
Pushing
P.AMP
ATT
turns OFF the Attenuator (no icon).
Displayed when the Attenuator is ON
RIT frequency
(3 digits)
RIT function
The RIT (Receive Increment Tuning) function
compensates for differences in frequencies of other
stations.
The function shifts the receive frequency up to ±9.99
without shifting the transmit frequency.
1. Push
RIT
.
•The RIT function turns ON.
L
While using the Fine Tuning function (p. 3-3), the RIT
frequency is displayed in 4 digits, instead of 3.
L
Pushing
RIT
again turns OFF the RIT function.
2. Set the RIT frequency to match the receiving
station’s frequency.
L
You can reset the RIT frequency to “0.00” by holding
down
CLEAR
for 1 second.
L
You can add the frequency shift to the operating
frequency by holding down
RIT
for 1 second
.
3. After communicating, push
RIT
to turn the RIT
function OFF.
Set RIT
frequency.
Rotate
D
RIT monitor function
When the RIT function is ON, you can directly monitor
the operating frequency by holding down
XFC
.
L
While monitoring, the RIT function is temporarily OFF.
L
While monitoring, the settings for the Noise Reduction,
NotchfilterandTwinPBTaretemporarilyOFF.
While holding down XFC
.