user manual

57
12 REJECTING INTERFERENCE
NOISE BLANKER
Noise Blanker was designed to reduce pulse noise
such as that generated by automobile ignitions.
Noise Blanker does not function in FM mode.
Press [NB/ LEVEL] to toggle the Noise Blanker ON
and OFF.
• “NB” appears when the function is ON.
You can further adjust the Noise blanker level from
1 to 10. The default level is 6.
Press [FUNC], [NB/ LEVEL], then turn the MULTI/ CH
control to adjust the noise blanker level.
• “NB LEVEL” and the current level appear on the
sub dot-matrix display.
Note: Noise Blanker is available only for the main transceiver in
SSB, CW, FSK, and AM modes.
PRE-AMPLIFIER
Switching the Pre-amplifier OFF may help reduce
interference from adjacent frequencies.
Press [PRE/ LOCK A] to toggle the Pre-amplifier ON
and OFF.
• “PRE” appears when the function is ON.
The ON/OFF setting will be automatically stored in
the current band. Each time you select the same
band, the same setting will be automatically selected.
The frequency range of each band is provided in the
following table (under “ATTENUATOR”).
Note: If the same frequency (144 MHz or 430 (440) MHz) band is
selected on both the main transceiver and the sub-receiver, the
pre-amplifier can be switched ON or OFF for both receivers. This
is because the main transceiver and sub-receiver share the same
antenna.
ATTENUATOR
The Attenuator reduces the level of received signals.
This function is useful when there is strong
interference from adjacent frequencies.
Press [ATT/ F LOCK] to toggle the Attenuator ON
and OFF.
• “ATT” appears when the function is ON.
The ON/OFF setting will be automatically stored in
the current band. Each time you select the same
frequency band, the attenuator setting will be
automatically recalled.
The frequency range of each band is shown below.
sdnaBycneuqerF
)zHM(
reifilpma-erP
)tluafeD(
rotaunettA
)tluafeD(
5.2~30.0FFOFFO
1.4~5.2FFOFFO
5.7~1.4FFOFFO
5.01~5.7NOFFO
5.41~5.01NOFFO
5.81~5.41NOFFO
5.12~5.81NOFFO
5.52~5.12NOFFO
0.03~5.52NOFFO
0.06~0.03NOFFO
003~811NOFFO
215~003NOFFO
0031~0421NOsyawlAFFOsyawlA
Note:
◆ If the same frequency (144 MHz or 430 (440) MHz) band is
selected on both the main transceiver and the sub-receiver, the
attenuator can be switched ON or OFF for both receivers. This is
because the main transceiver and sub-receiver share the same
antenna.
◆ Available receiving frequencies in the above frequency bands
vary, depending on the market code. Refer to the Specifications
{page 106} for details.
◆ If 118 ~ 135.995 MHz, 155 ~ 173.995 MHz or 220 ~ 229.995 MHz
is selected for the sub-receiver, the pre-amplifier cannot be turned
ON (K-type only).