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Updated Audio Receivers (markdown)

Brumi-2021
2025-03-07 23:40:15 +01:00
parent 9a4a8637d9
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Audio-Receivers.md

@@ -47,7 +47,7 @@ The Key Items on the App that can be seen or selected with the cursor and change
* **Gain:** The RF Amp settings. The Spectrum view is +/-20k.
* **USB+FM:** It is used to demodulate Wefax (HF Weather fax transmissions) , demodulating the signal in two steps, first demodulating the tuned RF signal in USB , extracting audio tones. And then demodulating again those FM modulated subcarrier audio tones, to extract APT low scan weather fax map signal. (that signal can be recorded into audio.wav file .
For a correct demodulation , we need to tune that published frequency applying negative offset (- 1.900Khz) , tuning and aligning the top max freq. "white" carrier (published) with top part aligned with top "yellow" mark, , as the following drawing,
Still current mayhem fw can not decoded the picture -we need external programs, but coming soon, please wait ...)
Still current mayhem firmware can not decode the map-picture , we need external tools... But coming soon, please wait ...)
![image](https://github.com/user-attachments/assets/3b76e009-d64f-495f-8976-1858502248ec)
![image](https://github.com/user-attachments/assets/58acad5c-5abe-4b2b-858f-eb8aed06a228)