FSKview

---
title: FSKview - QRSS and WSPR Viewer
description: FSKview is a high-resolution spectrogram for viewing narrowband frequency-shift keyed (FSK) signals in real time
---

# FSKview

**FSKview is a high-resolution spectrogram for viewing narrowband frequency-shift keyed (FSK) signals in real time.** FSKview can be used as a [QRSS](#QRSS) viewer, and if [WSJT-X](https://physics.princeton.edu/pulsar/K1JT/wsjtx.html) is running FSKview can label [WSPR](wspr.md.html) spots directly on the spectrogram as they are decoded.

<div align="center">

<a href="screenshot.png"><img src="screenshot.png" style="width: 80%"></a>

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## Download

Latest Build: December 19, 2021
* Windows 10: [**FSKview-1.3.0-win10.zip**](downloads/FSKview-1.3.0-win10.zip) (452 KB) - _may require the [.NET 6 Desktop Runtime](https://dotnet.microsoft.com/en-us/download/dotnet/thank-you/runtime-desktop-6.0.1-windows-x64-installer)_
* Windows 7: [**FSKview-1.3.0-win7.zip**](downloads/FSKview-1.3.0-win7.zip) (393 KB) - _may require the latest Windows Update_

## Configure as a QRSS Grabber

FSKview can serve as a [QRSS grabber](qrss.md.html), saving the latest grab every 10 minutes. Saved images are stamped with the date, time, and station information, and can be automatically uploaded to a web server using FTP. The settings button on the main screen launches an extended settings window, allowing the user to customize settings useful for fine-tuning behavior of a QRSS grabber.

<div align="center">

<a href="settings.png"><img src="settings.png" style="width: 80%"></a>
<br><br>
<a href="grabber.png"><img src="grabber.png" style="width: 80%"></a>
<br><br>

</div>

## QRSS and WSPR Example

This video shows my system listening to the 30m WSPR band over a 24 hour period. I don't have a great antenna, but it gets the job done well enough to demonstrate how this software works. The task manager is left open so you can see FSKview is not particularly resource intensive.

![](https://www.youtube.com/embed/gvbpA6TefgQ)


## Why _Viridis_ is Superior to Other Colormaps

Viridis is a carefully-designed colormap specifically created to maximize human perception while visualizing scientific data. Unlike many common colormaps, Viridis demonstrates a smooth increase in perceived visual intensity from low values through high values (it is _perceptually uniform_) and it uses intentionally-chosen color palette desined to maximize human perception (even in colorblind individuals). For these reasons, Viridis is the default colormap used for visualizing spectrograms in FSKview.

![](https://www.youtube.com/embed/xAoljeRJ3lU)

## Source Code

This software is open-source on GitHub:
* https://github.com/swharden/FSKview
* https://github.com/swharden/QRSS-Uploader

## Linux Support

FSKview seeks to be a simple click-to-run spectrogram similar to [Argo](https://digilander.libero.it/i2phd/argo/), but open-source and developed using modern programming techniques. FSKview uses Windows-specific code to interact with audio hardware and it does not support Linux. Excellent QRSS spectrogram software exists for Linux, including [LOPORA](https://www.qsl.net/pa2ohh/11lop.htm), [QRSSpig](https://gitlab.com/hb9fxx/qrsspig), and [Baudline](http://www.baudline.com/).