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The plug-in will not decode TETRAPOL.
TETRA and TETRAPOL are not similar in any way.
From what I read, TETRAPOL is encrypted and so would not be worth the effort.
I don't receive TETRAPOL where I am and would not be motivated to invest time and effort into it.

This package (version) of TETRA Trunk Tracker and TETRA Demodulator plug-in (with codec libtetradec.dll) are only meant to be used with each other and with no other previous versions. To do so will most likely cause issues. No changes to TETRA Demodulator plug-in in this release. If SDR# is crashin...

There is a bug in the latest version (1.0.15.8) that effects some users. To Recap: They ran SDR#+plug-in and TTT then clicked 'Start' in TTT, it set-up SDR# and then TTT retrieved the MCC/MNC/LA then did not continue processing any calls. You can see more about and a workaround here: Bug NOTE: This ...

I removed old links because of issues. I forgot to update here.

Latest version (v1.0.15.8) can be found here

Please read the included documentation and change logs.

Try

_controlWhateverYouNamedIt.DetectorType = DetectorType.WFM;

Also have a look at Al Brown's source code Here, shows usage examples of different interface controls.

Hope that helps.

With the recent changes to TETRA Trunk Tracker and the TETRA plug-in both may experience more frequent issues. Bear with me through these issues and help if you can by supplying detailed reports of any problems you have. (e.g. TTT version, TTT mode and selected options, Plug-in selected options and ...

The encrypted PDU output was inadvertently removed in v1.0.13.
It has been restored in v1.0.14. Not posted on here yet. See RR.

Any encrypted PDU in older versions reported invalid data, this includes anything that was shown in the Calls tab.
This will not be shown in newer version. See post here

With the recent changes to TETRA Trunk Tracker and the TETRA plug-in both may experience more frequent issues. Bear with me through these issues and help if you can by supplying detailed reports of any problems you have. (e.g TTT version, TTT mode and selected options, Plug-in selected options and S...

It should be noted that TETRA Trunk Tracker will only work with the TETRA Demodulator Plug-in that is packaged with it.

It will not work with the January 2019 version that TSSDR has recently release.

It is in alpha stage . This means is may contain errors that may cause issues with the other programs it works with. i.e. crashing them or itself. Although I'm not seeing this. TETRA Demodulator plug-in has been updated by me. "Tweaked Edition (Unofficial) v1.0.7.0" It's is required for some SDS fea...