March 27th, 2021
WSPR Code Generator
WSPR (Weak Signal Propagation Reporter) is a protocol for weak-signal radio communication. Transmissions encode a station's callsign, location (grid square), and transmitter power into a frequency-shift-keyed (FSK) signal that hops between 4 frequencies to send 162 tones in just under two minutes. Signals can be decoded with S/N as low as −34 dB! WSJT-X, the most commonly-used decoding software, reports decoded signals to wsprnet.org so propagation can be assessed all over the world.
WsprSharp is a WSPR encoding library implemented in C#. I created this library learn more about the WSPR protocol. I also made a web application (using Blazor WebAssembly) to make it easy to generate WSPR transmissions online: WSPR Code Generator
WSPR Transmission Information
- One packet is 110.6 sec continuous wave
- Frequency shifts between 4 tones
- Each tone keys for 0.683 sec
- Tones are separated by 1.4648 Hz
- Total bandwidth is about 6 Hz
- 50 bits of information are packaged into a 162 bit message with FEC
- Transmissions always begin 1 sec after even minutes (UTC)
Resources
- WSPR Code Generator - encode WSPR messages from your browser
- WsprSharp - a .NET library for encoding and decoding WSPR transmissions using C#
- FSKview - spectrogram for viewing frequency-shift keyed (FSK) signals in real time
- Anatomy of a WSPR transmission
- WSPR on Wikipedia
- K1JT Program
- Grid square lookup
- WSJT on SourceForge
- WSPR Mode in WSJT-X
Markdown source code last modified on September 12th, 2021
--- Title: WSPR Code Generator Description: An online resource for generating encoded WSPR messages Date: 2021-03-27 8PM EST Tags: blazor, amateur radio, qrss --- # WSPR Code Generator **[WSPR](https://en.wikipedia.org/wiki/WSPR_(amateur_radio_software)) (Weak Signal Propagation Reporter) is a protocol for weak-signal radio communication.** Transmissions encode a station's callsign, location (grid square), and transmitter power into a frequency-shift-keyed (FSK) signal that hops between 4 frequencies to send 162 tones in just under two minutes. Signals can be decoded with S/N as low as −34 dB! [WSJT-X](https://physics.princeton.edu/pulsar/k1jt/wsjtx.html), the most commonly-used decoding software, reports decoded signals to [wsprnet.org](https://wsprnet.org/) so propagation can be assessed all over the world. **[WsprSharp](https://github.com/swharden/WsprSharp) is a WSPR encoding library implemented in C#.** I created this library learn more about the WSPR protocol. I also made a web application (using Blazor WebAssembly) to make it easy to generate WSPR transmissions online: [WSPR Code Generator](https://swharden.com/software/wspr-code-generator) [](https://swharden.com/software/wspr-code-generator) ### WSPR Transmission Information  * One packet is 110.6 sec continuous wave * Frequency shifts between 4 tones * Each tone keys for 0.683 sec * Tones are separated by 1.4648 Hz * Total bandwidth is about 6 Hz * 50 bits of information are packaged into a 162 bit message with [FEC](https://en.wikipedia.org/wiki/Error_correction_code) * Transmissions always begin 1 sec after even minutes (UTC) ### Resources * [WSPR Code Generator](https://swharden.com/software/wspr-code-generator) - encode WSPR messages from your browser * [WsprSharp](https://github.com/swharden/WsprSharp) - a .NET library for encoding and decoding WSPR transmissions using C# * [FSKview](https://swharden.com/software/FSKview/) - spectrogram for viewing frequency-shift keyed (FSK) signals in real time * [Anatomy of a WSPR transmission](https://swharden.com/software/FSKview/wspr/) * [WSPR](https://en.wikipedia.org/wiki/WSPR_(amateur_radio_software)) on Wikipedia * [K1JT Program](http://physics.princeton.edu/pulsar/K1JT/devel.html) * [Grid square lookup](http://www.levinecentral.com/ham/grid_square.php?Grid=FN20) * [WSJT](https://sourceforge.net/projects/wsjt/) on SourceForge * [WSPR Mode in WSJT-X](https://wsprnet.org/drupal/node/5563)