Icom IC-7610 Instruction Manual basic - Page 31

RECEIVING AND TRANSMITTING, Preamplifiers, Attenuator, RIT function

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4 RECEIVING AND TRANSMITTING 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 the received signals are weak. LEach band memorizes the previously used Preamplifier setting. Touch [P.AMP]. LEach touch sequentially selects "P.AMP 1," "P.AMP 2," and "P.AMP OFF." P.AMP 1 P.AMP 2 Wide dynamic range preamplifier. It is most effective for the HF low bands. ••Gain is approximately 12 dB. High-gain preamplifier. It is most effective for the higher bands. ••Gain is approximately 20 dB. NOTE: ••When you use the preamp while receiving strong signals, the receiving signal may be distorted. In such case, turn OFF the preamp. ••While the Digital Selector is ON, "P.AMP OFF" is fixed, and you cannot select "P.AMP 1" or "P.AMP 2." Attenuator The Attenuator prevents a signal from becoming distorted when a very strong signal is being received near your operating frequency, or when a very strong electric field, such as from a broadcasting station. Touch [ATT] to sequentially set the Attenuator up to 18 dB in 6 dB steps. You can also set the Attenuator in 3 dB steps: 1. Touch [ATT] for 1 second to open the ATT menu. RIT function The RIT (Receive Increment Tuning) function compensates for differences in the transmit 1 frequencies of other stations. The function shifts your Main bandʼs receive frequency 2 up to ±9.99 kHz without shifting your transmit frequency. 3 1. Push RIT to turn ON the RIT function. 4 LWhile using the Fine Tuning function (p. 3-4), the RIT frequency is displayed in 4 digits, instead of 3. 5 RIT frequency 6 7 8 2. Rotate RIT/ TX to set the RIT frequency to match 9 the transmitting station's frequency. LYou can reset the RIT frequency to "0.00" by holding 10 down CLEAR for 1 second. LYou can add the frequency shift to your operating 11 frequency by holding down RIT for 1 second. 3. When you have finished communicating, push 12 RIT to turn the RIT function OFF. 13 RIT 14 15 16 17 DDUsing the RIT Monitor function 18 When the RIT function is ON, you can monitor your operating frequency while holding down XFC . 19 LWhile monitoring: 20 ••The RIT function is temporarily OFF. ••The Noise Reduction, Notch filter and Twin PBT 21 settings are temporarily OFF. XFC Displayed 2. Rotate MULTI to adjust the attenuator level of up to 45 dB. 4-1

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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 the received
signals are weak.
L
Each band memorizes the previously used Preamplifier
setting.
Touch [P.AMP].
L
Each touch sequentially selects “P.AMP 1,” “P.AMP 2,”
and “P.AMP OFF.”
P.AMP 1
Wide dynamic range preamplifier.
It is most effective for the HF low bands.
• Gain is approximately 12 dB.
P.AMP 2
High-gain preamplifier.
It is most effective for the higher bands.
• Gain is approximately 20 dB.
NOTE:
• When you use the preamp while receiving strong
signals, the receiving signal may be distorted. In such
case, turn OFF the preamp.
•
While the Digital Selector is ON, “P.AMP OFF” is fixed,
and you cannot select “P.AMP 1” or “P.AMP 2.”
Attenuator
The Attenuator prevents a signal from becoming
distorted when a very strong signal is being received
near your operating frequency, or when a very strong
electric field, such as from a broadcasting station.
Touch [ATT] to sequentially set the Attenuator up to 18
dB in 6 dB steps.
RIT function
The RIT (Receive Increment Tuning) function
compensates for differences in the transmit
frequencies of other stations.
The function shifts your Main bandʼs receive frequency
up to ±9.99 kHz without shifting your transmit
frequency.
1. Push
RIT
to
turn ON the RIT function.
L
While using the Fine Tuning function (p. 3-4), the RIT
frequency is displayed in 4 digits, instead of 3.
2. Rotate
RIT/
TX
to set the RIT frequency to match
the transmitting 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 your operating
frequency by holding down
RIT
for 1 second
.
3.
When you have finished communicating, push
RIT
to turn the RIT function OFF.
D
Using the
RIT Monitor function
When the RIT function is ON, you can monitor your
operating frequency while holding down
XFC
.
L
While monitoring:
• The RIT function is temporarily OFF.
•
The Noise Reduction, Notch filter and Twin PBT
settings are temporarily OFF.
RIT frequency
RIT
XFC
You can also set the Attenuator in 3 dB steps:
1.
Touch [ATT] for 1 second to open the ATT menu.
2.
Rotate
MULTI
to adjust the attenuator level of
up to 45 dB.
Displayed