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@ -10,19 +10,19 @@ The motivation to develop this firmware is to provide cleaner, customizable and
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more modular codebase for developing RS41 radiosonde-based experiments.
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The main features this firmware aims to implement are:
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* DMA/Timer-based modulation of APRS and some other digital modes via JTEncode library
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* DMA/Timer-based modulation for APRS and many digital modes via JTEncode library
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* Support for HF/VHF transmissions via an external Si5351 chip connected to the external I²C bus
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* Support for custom sensors via the external I²C bus
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## Features (work in progress)
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* APRS on 70cm amateur radio band via Si4032 radio chip
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** Bell 202 timing is done via DMA transfers to achieve greater accuracy, but I have not been able to get the timings working correctly
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* Bell 202 timing is done via DMA transfers to achieve greater accuracy, but I have not been able to get the timings working correctly
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* Digital mode beacons on HF frequencies via a Si5351 radio chip connected to the external I²C bus of the RS41 radiosonde
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** The JTEncode library provides JT65/JT9/JT4/FT8/WSPR/FSQ beacon transmissions. I've decoded FT8 and WSPR successfully.
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* The JTEncode library provides JT65/JT9/JT4/FT8/WSPR/FSQ beacon transmissions. I've decoded FT8 and WSPR successfully.
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The implementation is missing correct scheduling of transmissions via GPS clock.
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* Support for additional sensors via the external I²C bus
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** There is a driver for Bosch BMP280 barometric pressure / temperature / humidity sensor included
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* There is a driver for Bosch BMP280 barometric pressure / temperature / humidity sensor included
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### Bell FSK modulation hack for APRS
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@ -46,4 +46,5 @@ the timings are mostly off for some unknown reason.
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# Authors
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Authors of the [RS41HUP](https://github.com/df8oe/RS41HUP) project
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Mikael Nousiainen OH3BHX <oh3bhx@sral.fi>
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