Configuring The Peak Gain; Audio Peak Filter In The Fsk Mode; Noise Blanker; Turning On/Off Noise Blanker 1/2 - Kenwood TS-890S Instruction Manual

6 REJECTING INTERFERENCE

Configuring the Peak Gain

To further enhance the target CW signal, raise the gain level.
1 Select CW mode.
2 Press and hold F [APF] to display the audio peak
filter (APF) screen.
3 Press F6 [GAIN +] or F7 [GAIN -] to adjust the gain
level.
Setting Value 0dB (default) to +6dB
4 Press and hold F [APF] or press [ESC] to end the
process.

Audio Peak Filter in the FSK Mode

When receiving signals in the FSK mode, allowing both the mark
and space frequencies to have a peak help to reduce the
occurrence of garbled characters, thus improving the decodability.
This audio peak filter is compatible with the high tone (mark
frequency of 2125 Hz) as well as the low tone (mark frequency of
1275 Hz).
1 Select FSK mode.
2 Press F [APF].
• Pressing F [APF] each time toggles the audio peak filter of
the selected band between ON and OFF.
• When audio peak filter is on, "ON" is displayed on the key
guide. "OFF" is displayed when the audio peak filter is turned
off.
When the shift width in RTTY exceeds 170 Hz, the audio
●
peak filter for the selected band cannot be set to ON.
Internally demodulated signals are not processed for the
●
audio filter in the FSK mode.
The passband cannot be shifted for the audio peak filter
●
in the FSK mode.
6-6

Noise Blanker

The noise blanker is used to reduce pulse noise. This transceiver
is equipped with two types of noise blankers: NB1 that employs
analog signal processing and NB2 that performs DSP (digital
signal processing) at the IF level. Furthermore, two types of NB2
with different operating principles are available for selection. NB1
and NB2 can be selected for use according to the noise conditions.
They can also be employed at the same time.
Noise blanker cannot be used in the FM mode.
●

Turning ON/OFF Noise Blanker 1/2

Press [NB1] or [NB2].
Pressing [NB1] or [NB2] each time toggles noise blanker 1 and
noise blanker 2 respectively between ON and OFF.
• When noise blanker 1 or 2 is ON, <<
is displayed on the screen.
• When both noise blanker 1 and 2 are ON, <<
displayed on the screen.
.

Adjusting the NB1 Level

1 Press and hold [NB1] to display the Noise Blanker
1 configuration screen.
.
2 Press F4 [–] or F5 [+], or turn the [MULTI/CH] control
to change the level.
Setting Value 1 to 10 (default) to 20 (1 step)
• Configuring to a larger value reduces the noise further.
Configuring the noise blanker level to a larger value may
●
cause the transceiver to malfunction and distort the RX
audio depending on the condition of the RX signal or
interfering signal.
3 Press and hold [NB1] or press [ESC] to end the
process.
>> or << >>
>> is