Attached is a screen shot showing what you are looking for. This one is for a tone set of 322/338. Until TTD starts receiving audio with tone indications like this, it won’t decode. Perhaps you need to adjust your scanner volume or otherwise improve the audio.
I don't think the radio audio is reaching TTD. As a test, can you switch the radio to a weather channel and then see the TTD data scrolling start and stop when you turn the weather channel on and off?
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