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PT-8000A Operating Manual v2.00.33
13
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13.1 Notch Filter: IF-Notch and DSP Multi Notch
13.1.1 IF-NOTCH Filter
Fig. 60
13.1.2 DSP Multi NOTCH Filter („digital" MNF)
Fig. 62
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Two notch filters of different type are available in the PT-8000A.
st
One is working at 1
IF @ 40.7 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 Multi-Notch Filter
(ANF/MNF) – here called the DSP NOTCH.
IF-NOTCH and DSP-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.
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.
Turning IF-NOTCH will adjust the variable notch through the passband hence
the interference will be almost nullified.
Pushing the NOTCH button located in
the cluster DSP will activate the
automatic multi-notch filtering
(ANF/MNF):
On the display the DSP NOTCH is outlined as NOTCH 1.
DSP NOTCH-LED will be on.
The DSP will now detect even multiple interferences and will cancel them
effectively.
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47
Fig. 61
Fig. 63
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