WSPR - whisper

WSPR is a very low power, very slow way of transmitting some key information. It is used to test propagation conditions. You have your own WSPR transmitter, and other people will receive you. The reception data is collected on a web site and you can get an immediate map of where you are being received.

I have got a WSPR system for reception going here.

I use my browser, Safari, and connect to the web SDR receiver at websdr.ewi.utwente.nl:8901. Then I pipe the output of Safari, normally connected to the system Internal Speakers, to SoundFlower (2ch).



The input to the WSPR program is taken from SoundFlower (2ch) and so it receives the sound from the SDR radio.



This is the result.