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Roman Piksaykin 2023-12-02 17:43:15 +03:00 zatwierdzone przez GitHub
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@ -12,7 +12,7 @@ Currently the upper freq. limit is about 9.4 MHz and it is achieved only using P
![mfsk-spectra](https://github.com/RPiks/pico-hf-oscillator/assets/47501785/a8309813-8e77-407e-abfc-58cbd262c35c) ![mfsk-spectra](https://github.com/RPiks/pico-hf-oscillator/assets/47501785/a8309813-8e77-407e-abfc-58cbd262c35c)
Here is an example of narrowband FSK (5 Hz step, 20 Hz range in total). Here is an example of narrowband FSK (9.4 MHz carrier, 5 Hz step, 20 Hz range in total).
# Phased locked loop in C # Phased locked loop in C
The DCO uses phase locked loop principle programmed in C. The DCO uses phase locked loop principle programmed in C.
@ -23,7 +23,7 @@ transmit the signal, you should calculate and provide a lowpass filter of
appropriate frequency. Please also figure out whether you possess rights appropriate frequency. Please also figure out whether you possess rights
to emit radio frequency energy on desired frequency. to emit radio frequency energy on desired frequency.
# GPS reference frequency correction (optional) since V0.9 # GPS reference frequency correction (optional) since v.0.9
GPS reference frequency correction option provides an absolute frequency error within about ~1Hz in long term. GPS reference frequency correction option provides an absolute frequency error within about ~1Hz in long term.
![pico-hf-oscillator](https://github.com/RPiks/pico-hf-oscillator/assets/47501785/06700e39-6b5f-4a6a-828a-d1cfdd9418ce) ![pico-hf-oscillator](https://github.com/RPiks/pico-hf-oscillator/assets/47501785/06700e39-6b5f-4a6a-828a-d1cfdd9418ce)