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README.md

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 # pico-WSPR-tx
-WSPR beacon for Raspberry Pi Pico, based on pico-hf-oscillator library
+WSPR beacon for Raspberry Pi Pico, based on pico-hf-oscillator PLL DCO library as submodule.
+
+![Screenshot_2023-11-16_22-42-12](https://github.com/RPiks/pico-WSPR-tx/assets/47501785/9e2d0a9a-fe95-4e67-8b72-acd1011ed353)
+
+# *NO* additional hardware
+The WSPR beacon provides the output signal on the GPIO pin of Raspberry Pi Pico. No externall PLL, analog oscillators!
+You should only provide a lowpass filter of appropriate frequency if you want to use this module extensively.
+
+# For what?
+This is an experimental project of amateur radio hobby and it is devised by me in order to experiment with QRP narrowband digital modes.
+I am licensed radio amateur who is keen on experiments in the area of the digital modes on HF. 
+My QRZ page is https://www.qrz.com/db/R2BDY
+
+# Quick-start
+1. Install Raspberry Pi Pico SDK. Configure environment variables. Test whether it is built successfully.
+
+2. git clone https://github.com/RPiks/pico-WSPR-tx
+2.1. cd pico-WSPR-tx
+2.2. git submodule init
+2.3. ./build.sh
+2.4. Check whether output file ./build/pico-WSPR-tx.uf2 appears.
+
+3. Load the .uf2 file (2) into the Pico.
+
+4. Initialy the operating HF band is 40 meter (WSPR dial frequency is 7040 kHz).
+
+5. Provide the feedback by clicking like on the github page of the project.
+
+Cheers,
+Roman Piksaykin, amateur radio callsign R2BDY
+https://www.qrz.com/db/R2BDY
+[email protected]