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Updated Audio Receivers (markdown)

Brumi-2021 2024-03-25 11:07:20 +01:00
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Audio-Receivers.md

@ -44,6 +44,12 @@ 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 increase or decrease from 0..48kHz range with the knob rotary encoder with a jumps of 200 Hz steps. It will move a short vertical red line pointing the spectrum IF demodulated FM baseband FFT graphic . It could be useful to see the exact frequency of those spectrum peaks, like the below picture , showing 19Khz pilot carrier tone from a Stereo FM Broadcasting .
> ![image](https://github.com/portapack-mayhem/mayhem-firmware/assets/86470699/88ef7389-d7c0-47a8-84ed-05d836879af5)
* **SPEC.** The spectrum Secondary Items allows the view of the RF spectrum with different setting for maximum bandwidth shown: * **SPEC.** The spectrum Secondary Items allows the view of the RF spectrum with different setting for maximum bandwidth shown:
20M with markers at +/- 5M 20M with markers at +/- 5M