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14
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O T C H
O I S ER E D UC T I O N
14.1 Notch Filter Functions
14.1.1 IF-NOTCH
Picture 60
14.1.2 DSP-NOTCH
Picture 62
PT-8000 A · B · C User Manual
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Two Notch filter of different type are available in the PT-8000. One is working
st
at 1
IF 70.7 MHz – it´s the classical type of manual notch filtering using a
Xtal bridge – the IF-NOTCH. The other one is part of the DSP – it´s an
Automatic Notch Filter (ANF) – here called the DSP NOTCH.
DSP NOTCH and IF-NOTCH may be engaged simultaneously.
Notch filtering is not available in AM and FM. In case NOTCH filtering is active
and modes are changed to AM/FM both NOTCHs will cease operation.
After power on both NOTCH filters are off (Default value).
The IF-NOTCH will be activated by pushing the control IF-
NOTCH which is located as depicted. On the display it is
outlined as NOTCH 2.
•
•
Pushing the button NOTCH located in the cluster DSP will activte the
automatic notch filtering. On the display the DSP NOTCH is outlined as
NOTCH 1.
The DSP will now detect even multiple interferences and will cancel them
effectively.
•
•
O I S E B L A N K E R
The display will show NOTCH 2
Turning IF-NOTCH will adjust the varable notch
through the passband hence the interference will
be almost nullified.
DSP NOTCH-LED will be on
The display will show NOTCH 1
C–49
Picture 61
Picture 63
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