WSPRlite Flexi Antenna Performance Analysis System

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Currently out of stock

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! 

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.



Dimensions :- 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 supplied)


WSPRlite Flexi and Classic compared at a glance:

Video - WSPRlite Flexi or Classic?   How to choose?

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

Spare Micro USB lead - has data support

unlike many.  Guaranteed to work

with WSPRlite!

 Buy now




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.

26 Reviews Hide Reviews Show Reviews

  • 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.

  • 5
    Amazing gadget; the power of very low power!

    Posted by César. on 3rd May 2018

    I was delighted since the very first moment that I set it up to work. It is very easy to set-up, run, gather data and display QSOs from all around the world. A very didactic way too to test the effectiveness of your antenna or to compare data.

  • 5
    Very effective and useful tool

    Posted by Neil Hutton on 30th Apr 2018

    Recently upgraded from the WSPRlite classic and it does everything as expected on more bands. Works fine through the low pass filter kit also available through Sotabeams, and have had a couple of reports from Australia (WSPRlite in UK) using 100 mW -impressive!

  • 4
    Wsprlite has potential!

    Posted by Dave on 18th Apr 2018

    Have been using Wsprlite for a few months now. Am impressed with 200mW. Great tool for refining antennas. Unable to get drivers to work with Windows 10, had to resort to old XP device which won't work online. This means I cannot access premium mode. Would like to register, even if I have to pay for access to premium. Any suggestions? [Admin: a suggestion; why not contact SOTABEAMS for help? We are here to assist you.]

  • 5
    Brilliant little gadget!

    Posted by Tom G4KWL on 23rd Mar 2018

    Having recently come back to amateur radio in retirement, I cannot believe the technology now available for little effort and cost. To see signal report 'spots' appearing on my 40m DXplorer map from Australia, New Zealand and the USA on the first evening of use, was simply amazing. An outstanding method of antenna analysis and all using 200mW from a box the size of a matchbox!! Many thanks!

  • 5
    Funziona alla grande.

    Posted by Massimiliano on 15th Mar 2018

    Ottimo prodotto. Funziona molto bene ed il suo utilizzo è semplice ed efficace. La configurazione tramite PC non ha dato nessun problema. Ho acquistato la versione Flexi e sono molto soddisfatto. 73 de IU4HMZ [Translation: Great product. It works very well and its use is simple and effective. The configuration via PC did not give any problem. I bought the Flexi version and I am very satisfied. 73 of IU4HMZ}

  • 5
    A very good performer

    Posted by Borje Hansson on 11th Mar 2018

    I have completed LPF kit for 7 and 14 Mhz and tested the antenna analyzer (WSPR Flex) on those bands. I works as expected in conjuction whith my long wire antenna (22 m long) and ATU. My OTH is Sweden and my longest connections was North America and Austalia (Tasmania) on 14 MHz. I'm really astonished consider the output of 200 mW power. I really recommend this item for antenna analyzer work!

  • 5
    Brilliant kit

    Posted by Simon Pryce on 8th Mar 2018

    Not fully up to spec yet as the only LPFs I have usable at present are for 10m and 6m. I've run it for a couple of days on both bands but got no reports back on either. I monitored it locally just with the 857 while out mobile in the car so I know its working ok. I've now made up two of your filter boards which will give me 20, 17, 15, 12, 10 & 6. The box has been sourced and the mounting and switching arrangements are being developed. Simon, G0EIY

  • 5
    WSPRlite Flexi

    Posted by on 24th Feb 2018

    I am now proudly owner of the new WSPRlite. The advantages are the extended frequency ranges which allow me to test all required ham bands. Now I am able to check my antennas especially the real efficiency. Furthermore I can now check what coverage the propagation allows. A very useful product.