To get started with your WSPRlite, download the configuration app and follow these instructions:
Download instructions (English, PDF) - updated 2017-06-06
Download instructions (French, PDF) - unmaintained, updated 2017-05-24

Some tips on fault finding if it doesn't work:
WSPRlite fault finding (PDF) - updated 2017-06-08

Frequently Asked Questions (PDF) - updated 2017-02-15

Instructions on how to update the firmware (the software inside your WSPRlite):
WSPRlite firmware update instructions (PDF)

Or if you don't yet have a WSPRlite, buy one here.

Have you been asked to give a talk on your new WSPRlite at a local ham gathering or radio club? We have made it easy with this downloadable MS PowerPoint presentation. Feel free to alter it to suit your own audience. Let us know how it went!
WSPRlite presentation

Configuration app

The WSPRlite configuration app is used to change the callsign, locator, and other settings for your WSPRlite.

Download latest version (v1.0.8, released 2017-02-15):

What's new (see changelog for full version history):

System requirements: Windows Vista / 7 / 8 / 10.
Windows XP and older are not supported. Linux version might be available soon. Mac is not officially supported. The source code is cross platform, and is tested on Windows and Linux.


Before using the config app on Windows, the "CP210x USB to UART Bridge VCP" driver needs to be installed. Note: the zip file must be unzipped into another folder before installing.

USB drivers

Windows 10 users can sometimes skip this step as it may install the drivers automatically when the WSPRlite is connected to your computer.

Firmware update

Firmware updates may occasionally be released to add features or fix problems with your WSPRlite.

Download latest version (v1.0.7, released 2017-05-02):
Firmware update Instructions (PDF)

What's new (see changelog for full version history):


Configuration app changelog

Current version v1.0.8
Released 2017-02-15
Add 630m band
Released 2017-02-15
Add a setting to transmit a callsign using morse code after each WSPR transmission
More accurate power output at lower frequencies
Released 2017-01-19
Add a warning for old firmware versions
Released 2017-01-17
Fix random frequency bug on Windows
This is a critical update. All users who have programmed their WSPRlite using an older version of the config app should download the latest version of the app and reprogram their WSPRlite by changing band twice for continued optimum performance (assigns new random frequency). Once this is done, use as normal.
Released 2017-02-15
Add ability to update WSPRlite firmware
Released 2016-11-24
Added note about the limited precision of the transmitted locator
Added icon for executable
Released 2016-11-18
Added transmit frequency randomisation. ±50 Hz around the centre of the WSPR band, randomised whenever the band dropdown is changed in the config app.
Improved serial port dropdown default - it should now select the WSPRlite port automatically if the port is present when the program is started
Final beta test version

Firmware changelog

Current version v1.0.7
Released 2017-05-02
Random selection of transmit timeslots is now the same for all WSPRlites (if they have the same repeat rate setting), instead of being different every time the button is pressed. This allows WSPRlite transmissions to be synchronised.
Released 2017-02-15
Add a setting to transmit a callsign using morse code after each WSPR transmission
630m band now works properly
Released 2017-01-19
Fix a rare lockup when using certain transmission frequencies
Released 2017-01-09
Minor internal changes - no new user functionality.