Receiving And Transmitting; Preamplifiers; Attenuator; Meter Peak Hold - Icom IC-718 Basic Manual

Preamplifiers

Below the 1.59999 MHz bands
The preamp amplifies received signals in the receiver
front end to improve the signal-to-noise (S/N) ratio
and sensitivity. A preamp is used when receiving weak
signals.
The preamplifier functions below the 1.59999 MHz
bands, however, the sensitivity may be reduced.
L Each band memorizes the Preamplifier setting.
1. Select the operating band.
2. Push [P.AMP] to turn the preamplifier ON or OFF.
• "P.AMP" is displayed when the function is ON.
Displayed when
a preamp is ON
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
the frequency, or when a very strong electric field,
such as from a broadcasting station, is near your
location.
L Each band memorizes the Attenuator setting.
1. Select the operating band.
2. Push [ATT] to turn the 20 dB attenuator ON or
OFF.
• "ATT" is displayed when the function is ON.
Displayed when
the Attenuator is
ON

Meter peak hold

The meter peak hold function keeps the highest
displayed bar segment in any meter function for about
0.5 seconds so that you can read the meter indication
easier.
This function can be turned ON or OFF in the Initial
Set mode.
The peak meter remains for 0.5 seconds

RECEIVING AND TRANSMITTING

RIT function

The Receiver Incremental Tuning (RIT) function
compensates for differences in frequencies of other
stations.
The function shifts your receive frequency up to
±1.2 kHz without shifting the transmit frequency.
1. Rotate the [RIT] control to set the RIT frequency
2. To cancel the RIT function, rotate [RIT] to the

Noise Blanker

The Noise Blanker eliminates pulse-type noise, such
as the noise from car ignitions.
Push [NB] to turn the Noise Blanker ON or OFF.
Adjusting the Noise Blanker level
1. Hold down [NB] for 1 second to enter the Noise
2. Rotate [MAIN DIAL] to adjust the Noise Blanker
3. Push [NB] to exit the set mode.
NOTE:
• When using the Noise Blanker, received signals
may be distorted if they are excessively strong, or
the noise is other than a pulse type. In that case,
turn OFF the Noise Blanker.
• You can turn the Noise Blanker function in the AM
mode ON or OFF in the Initial set mode. (p. 20)
NB is OFF
to match the received station's transmit frequency.
RIT
• " is displayed while RIT frequency is set.
• The transmit frequency on the screen does not
change.
12 o'clock position.
RIT
• " disappears.
RIT OFF position
• "NB" is displayed while the Noise Blanker function is
ON.
Blanker level set mode.
level.
Pulse-type noise
NB LEVEL
Desired signal
4
NB is ON (Effective)
Desired signal
Noise removed
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