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raspi-pico-aprs-tnc
kopia lustrzana https://github.com/eleccoder/raspi-pico-aprs-tnc
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eleccoder 2022-11-18 17:53:14 +01:00
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@ -5,7 +5,7 @@ A TX-only [TNC](https://en.wikipedia.org/wiki/Terminal_node_controller) (Termina
![Signal Flow](https://github.com/eleccoder/raspi-pico-aprs-tnc/blob/main/doc/img/signal_flow.png)
Image: Block diagram showing the signal flow
Block diagram showing the signal flow
An analog line-out audio signal will be generated by a band-pass filter connected to GPIO-pin 'GP0' which provides the binary PWM signal. You can probe it by a scope, listen to it by using an audio amp, or connect it to any RF transceiver to send it on the air (ham radio license required).
@ -13,12 +13,6 @@ An analog line-out audio signal will be generated by a band-pass filter connecte
Image: Line-out signal (see [below](#Hardware)) probed by a DSO. We clearly see the 1200 Hz and 2200 Hz tones of the 1200 Bd 2-AFSK.
Basically, the data/signal flow is as follows:
```
APRS (text msg + geo-coordinates + meta-data) -> AX.25 -> PCM -> PWM -> Band-Pass filtering -> AFSK audio signal
```
Both a static library `libaprs_pico.a` and an example application will be generated by the build.