WSPRlite Flexi Antenna Performance Analysis System

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WSPRlite Flexi; 6 meters through to 630 meters!

Windows and Android configuration

Easy to use


Michael G0POT gives this thoughts on the WSPRlite Flexi

WSPRlite Flexi Propagation and Antenna Tester

All WSPRlite users gain free access to Premium features of (subject to terms below)

 Wondering how well your antenna works? WSPRlite with DXplorer will tell you...

The WSPRlite is a special test transmitter that sends a signal to a Worldwide network of receiving stations. When used with our web-based DXplorer system, it's a powerful new way to evaluate antenna performance. Going way beyond antenna modelling or antenna analyzers, this unique system allows you to see how your antenna is performing in its actual location and in real-time! This type of analysis has never been possible before. 

  • Click here for a range of handy accessories for your WSPRlite
  • Click here for low pass filter options  


  • antenna performance testing (great for contesters)
  • compare antennas
  • compare locations
  • test beam antennas
  • spot openings when you are out of the shack

...all in a way that has never been possible before! 

WSPRlite Flexi and Classic compared at a glance:


Note: 60m now supported.

More bands...

As soon as the WSPRlite Classic was launched, people asked us for more bands. The Classic has a hardware limitation on the maximum frequency. The Flexi required significant additional development work on the hardware and firmware to add five great new bands:
17m, 15m, 12m, 10m and 6m*.

Interference Avoidance Algorithm

WSPR continues to increase in popularity. Because of this, the chance of co-channel interference has risen. The WSPRlite Flexi's Interference Avoidance Algorithm uses statistical data on the frequency distribution of WSPR transmitters to helps it to pick frequencies that are more likely to be clear. Other improvements in the Flexi means that it uses a much higher proportion of the available WSPR spectrum - again helping to reduce the chances of interference to and from other WSPR users.

User defined transmit frequency

A powerful feature of all WSPRlites is their ability to run synchronised with other WSPRlites. By analysing synchronous data the measurement performance is vastly improved compared to other comparison methods as all the data is from simultaneous transmissions. To facilitate synchronous use, Flexi users can manually enter the frequency that they wish to use for each unit. This facility is only available with the Flexi.

Increased Maximum Run-time**

WSPRlite Flexis are all soak tested in our factory to pre-age the TXCOs. They are then individually adjusted against a Rubidium standard. With these more accurate oscillators we have been able to increase the run time to 45 days. This facility is only available with the Flexi.

Low Pass Filters

The WSPRlite Flexi has no internal filtering and thus the user will need to add filtering before use. We are working on a range of options and the first is our three-band lowpass filter PCB. This is sold as a bare board allowing you to implement your own filters. We offer a range of component kits for various bands. We will be introducing some more low pass filter options early next year.  

Also available from our international agent(s): 
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Low pass filter kit

 Buy now

Connect your WSPRlite

to your antenna with

a handy adapter.

SMA-SO239 (UHF socket)

 Buy now

Connect your WSPRlite

to your antenna with

a handy adapter.

SMA-BNC socket
 Buy now

SMA leads - various options

BNC, PL259 etc.

 Buy now

Micro USB lead - has data support

unlike many.  Guaranteed to work

with WSPRlite!


WSPRlite is not supplied

with a USB lead as most people

have these already.

 Buy now


facebook.jpg New to WSPRlite and DXplorer? Why not join the WSPRlite Facebook Community to see what people are doing with theirs? It's a good place to get user-community support, share tips and experience. Note that SOTABEAMS does not monitor this group; always contact us direct for support.



40 x 50 x 10 mm

Beacon power: 200 mW (software configurable: 5 mW - 200 mW); 6m limited to 100mW

VSWR: better than 3:1 recommended

Maximum reverse power < 100 mW (power levels above this will damage the WSPRlite's USB chip)

Bands covered: 630-160-80-60-40-30-20-17-15-12-10-6 m

USB current: 150 mA maximum (5 Volts).

Antenna connector: SMA socket

Power connector: micro USB socket (lead not supplied)


The WSPR propagation reporter system was conceived and devised by Professor Joe Taylor K1JT

DXplorer uses data freely provided by - our thanks to them.

We also thank the hundreds of people who operate WSPR receivers around the World - you make it all possible!



Our provision of DXplorer relies on free access to data from is provided “as is”. It is not a guaranteed service. It relies on access to third-party data over which we have no control.

*6m output power 100mW

**Check local regulations regarding unattended beacons.

Config app tested on Windows 7, 8, 10 and Vista

US customers should operate in accordance with FCC Regulation Section 97.203


Instructions are available HERE!


DXplorer, WSPRlite and DX10 are Trademarks of ECS Ltd t/a SOTABEAMS. (C) ECS Ltd 2016. All rights reserved.

23 Reviews Hide Reviews Show Reviews

  • 5
    Useful tool to have in your box

    Posted by Ian Pryke on 22nd Sep 2019

    Helpful stall and a quick response

  • 5
    WSPR flexi

    Posted by Robert Poortvliet on 1st Sep 2019

    Very nice compact piece to send beacons into the world on all the hf bands incusief 6 meters. Ideal for try out antennas or propagation tests

  • 5
    Great product

    Posted by F4EPP on 24th Jun 2019

    Everything was easy at the beginning. I'd appreciate to find the driver/app webpage more easily.
    This device is incredible to test and understand the propagation. I was happy to be heard by many active receivers on all bands what is obviously necessary to be powerfull. I don't use band filter yet and everything is OK so far.

  • 5

    Posted by Terry Martin on 1st Feb 2019

    A great overall system for evaluating propagation and comparing antenna designs. The port of the setup software to the latest MacOS (Mojave) system also works a treat (see Facebook group).

  • 5
    Well thought-out product and lots of fun!

    Posted by Kenneth Maltz on 18th Dec 2018

    The combination of the WSPRlite Flexi and Dxplorer works to enable you to evaluate your antenna systems while having lots of fun pushing the DX envelope with up to a whopping 200 mw of power! I've been spotted by stations up to 13,500 km from my NY, USA QTH. That's with a long wire and 200 mw. I can set it to transmit automatically for days and then DXplorer provides me with a list of spots in both spreadsheet and world map formats.

  • 5
    WSPRLite Flexi

    Posted by Ian D Baines on 9th Dec 2018

    The Flexi is an impressive little device. I was able to install the software and get the unit programmed in about ten minutes. I connected it to my dipole in a pine tree, not expecting much DX as the power is so low and the antenna is in a valley. Within a few hours I was getting reports from Europe, all over the US and Antarctica on 40. To say that I was thrilled is an understatement. Since that time I have used two of the units on the same band to compare antennas (height wins) and on different bands to compare propagation (two antennas). I am now running the Flexi at minimum power of 5 mW to see just how far it can be heard. My record so far is 2300 km, and this from a dipole in a valley. That equates to more than 400,000 km per watt. As I get used to this little magic box, the ideas are coming fast and furious. Putting it on odd bands, like 630 and 6. Using it mobile with random wires, tweaking my antenna to maximize the distance per watt. I intend to take it to Florida where we have a restriction on antennas and simply hide it along with a wire and battery in a palm tree. Then watch how far it can go. An amazing and simple to use magic box.

  • 5
    WSPRlite Flexi

    Posted by David G4ZAO on 18th Aug 2018

    Great product and works great in practice.

  • 5
    WSPRLite Antenna Analyzer

    Posted by Jay Wilson on 10th Aug 2018

    Unit is very frequency accurate could be used as a freq generator if app was available. Some drift on 6M in the decode at 200mW but I know how hard this is to achieve. Would be nice to have the original 80M frequency band since this is still used. In general very pleased with their achievement with the frequency and timing accuracy

  • 5
    WSPRLITE Flexi

    Posted by David Hepworth on 29th Jul 2018

    Simple to set up and very useful for checking antenna performance; basically, does what it says on the tin.