Kenwood TS-990S Operation Manual - Page 145

Rejecting Interference, Attenuator (att), Preselector

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6 REJECTING INTERFERENCE ATTENUATOR (ATT) An attenuator is a function that attenuates or reduces the received signal level. When there is a strong signal present near the target signal, attenuating the adjacent signals can reduce or eliminate the interference. The target signal will also be attenuated; however, this will facilitate you distinguishing the weak signal. This will help a very strong signal from being distorted. The transceiver is equipped with three levels of attenuation, -6 dB, -12 dB, and -18 dB. '

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6-1
6 REJECTING INTERFERENCE
Index
Contents
ATTENUATOR (ATT)
An attenuator is a function that attenuates
or reduces
the received signal level. When there is a strong signal
present near the target signal, attenuating the adjacent
signals can reduce or eliminate the interference.
The target signal will also be attenuated; however, this will
facilitate you distinguishing the weak signal.
This will help a very strong signal from being distorted.
The transceiver is equipped with three levels of
attenuation, -6 dB, -12 dB, and -18 dB.
F[ATT]
1 [ATT]
(F) to select the attenuation level of the received
signal.
•
The attenuation level appears on the key guide displayed
on the right side of the main screen.
•
Each time you press
[ATT]
(F), the level cycles as follows:
OFF > -6 dB > -12 dB > -18 dB > OFF. Each time you press
and hold
[ATT]
(F), the attenuation level cycles in the
reversed sequence.
PRESELECTOR
Selecting the narrow bandwidth tunable filter attenuates
the interfering signal which has 2 to 3 MHz separation
from the target frequency, instead of the strong interfering
signal in the adjacent frequencies.
[F1]~[F7]
[ESC]
[MULTI/CH]
F [P.SEL]
1
Select the main band.
2
Press
[P.SEL]
(F) to enable or disable the Preselector.
The default is "OFF".
In the key guide
[P.SEL]
(F), the status of attenuator is
indicated on the lower line.
While the Preselector is active, the status indicators below
show how the operating band is shifted from the center
frequency.
◀ON:
The filter bandwidth has been shifted to below the center
frequency.
On
The filter bandwidth has been positioned at the center
frequency.
ON▶:
The filter bandwidth has been shifted to above the center
frequency.
Note:
◆
The Preselector can only be used for the main band.
◆
The preselector can be used in the 1.8 MHz band, 3.5 MHz band,
7 MHz band, 10 MHz band, 14 MHz band, 18 MHz band, 21 MHz
band, 24 MHz band, and 28 MHz band.
◆
The turning on and off of the preselector can be configured for
each of the above bands.
◆
Preamplifier and Preselector cannot be enabled at the same time.
Enabling the Preselector while the Preamplifier is active temporarily
disables the Preamplifier. The Preamplifier will be enabled again
when the Preselector is disabled.