Tracking Noise Filter question

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  • Updated 3 years ago
I have been trying to get the Tracking Noise Filter to work on a slice. I can only get it to work on the DAX audio going to third party Apps. I would think that if it is working properly, I should see my s-meter level drop substantially when the TNF is enabled over an interfering signal within the slice passband. It does not do anything inside the passband of my received audio, only on the audio sent to DAX rx stream.
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Keith Flint

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Posted 3 years ago

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Dan -- KC4GO

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The Tracking Notch Filter (an audio notch) comes after all the RF portions of the radio therefor it will not show an effect in the S-Meter or the Waterfall  but will show in the audio on the third party applications using DAX. You should be able to hear it take effect in the Speakers attached or remote audio.
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Ken - NM9P

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Correct.  the TNF is a panadapter/SCU notch routine, not a slice routine.

TNF doesn't affect anything in the panadapter display or meters, only the received audio.  But you should notice the change in audio in both DAX and local speakers/headphones.

The reason it is showing an effect in your third party digital aps is that they are showing the actual audio output of the rig AFTER the filter is applied and this is reflected in the waterfall of the third party software.  

The rig's panadapter is tapped directly from the SCU sampling routine BEFORE any of the slices are tapped, DAX channels are sent, or any demodulation is done.

The TNF is effective anywhere in the Panadapter, or actually anywhere on ANY panadapter that is active in the rig.  (Setting a TNF and making it "remembered" will enable the notch even on all 8 panadapters of a 6700.)