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):





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


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

17 Reviews Hide Reviews Show Reviews

  • 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.

  • 5
    Simple and effective design.

    Posted by G7YTZ on 28th Jan 2018

    Great product, easy to set up and results are impressive . It would be great if filtering has been included, and the ability for the software to switch bands in a schedule, but here’s for future models.

  • 5
    Just amazing

    Posted by Jukka Tarvainen on 28th Jan 2018

    Works fine. Easy to setup. Make or get low-pass filter for band desired and get on the air. I was surprised to see that 200 mW was enough on 160 meters to reach Antarctica, over 15000 km. Just amazing. Will make more testing on other bands too. Have made LPF for 80 and 160 already. And have BPF available for 20 and 15. Planning to put more permanent installation on 30 m with some short vertical.

    73 de Jukka OH4MFA, OG4T

  • 5
    Flexi takes it further

    Posted by Steve Down G3USE on 11th Jan 2018

    Great development on original. I plan to check aerials and propagation particularly, on 10 and 6, during the coming sporadic E months. With these products, you quickly find out if an aerial working without misleading 59/599 reports. Especially useful for height or space limited aerials.

  • 5
    Ultimate Superrr Device!

    Posted by Vadim on 25th Dec 2017

    Many thanks from Far North for Flexi!
    Installed in KP69AK near VHF Beacon. Full info here!

    73 Richard & All from UA1ZFG, Vadim

  • 5

    Posted by David M0VGA on 19th Dec 2017

    I already own three WSPRLite Classic models which provide flexibility to perform real time tests against different antennas under different call signs.

    The new WSPRLite Flexi adds some great new features - more bands & a more stable crystal oscillator which allows for a longer continuous running period.

    As ever, amazing results on WSPR using mW rather than Watts or KW!

    Very pleased, and very addicted!
    73, David M0VGA

  • 5
    Tres bon produit

    Posted by Jean Marie TALAUCHER on 16th Dec 2017

    Très bon produit ; je passe beaucoup de temps a tester mes antennes

    Happy new year