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Updated Audio Receivers (markdown)

Brumi-2021 2024-03-25 11:17:37 +01:00
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Audio-Receivers.md

@ -44,7 +44,7 @@ The Key Items on the App that can be seen or selected with the cursor and change
* (3) 40k with also sharp transition, for supporting NOAA APT weather satellite reception in 137 MHz . (that filter is too narrow for WFM with 75khz delta deviation and can produce audio distortion in the demodulated sound). The Spectrum view is +/-100k with a marker That may be changed (though seem the incorrect value). * (3) 40k with also sharp transition, for supporting NOAA APT weather satellite reception in 137 MHz . (that filter is too narrow for WFM with 75khz delta deviation and can produce audio distortion in the demodulated sound). The Spectrum view is +/-100k with a marker That may be changed (though seem the incorrect value).
* Just below REC Icon we have a marker Frequency field input (0 Hz) , that we can adjust in a range from 0..48kHz range with the knob rotary encoder, with 200 Hz step jumps. It will move a short vertical red line pointing cursor across the spectrum Multiplex IF demodulated FM baseband FFT graphic . It could be useful to see and confirm the exact frequency of those spectrum peaks, like the below picture , showing 19Khz pilot carrier tone from a usual Stereo FM Broadcasting. * Just below REC Icon we have a marker Frequency field input (0 Hz) , that we can adjust from 0..48kHz range with the knob rotary encoder, with 200 Hz step jumps. It will move a short vertical red line pointer cursor across the Multiplex FM demodulated baseband FFT spectrum graphic. It could be useful to see and confirm the exact frequency of those spectrum peaks, like the below picture , showing 19Khz pilot carrier tone from a usual Stereo FM Broadcasting.
> ![image](https://github.com/portapack-mayhem/mayhem-firmware/assets/86470699/88ef7389-d7c0-47a8-84ed-05d836879af5) > ![image](https://github.com/portapack-mayhem/mayhem-firmware/assets/86470699/88ef7389-d7c0-47a8-84ed-05d836879af5)