Topic: Wisper mode...
For doing low power WSPR mode download using git the following line:
git clone https://github.com/threeme3/WsprryPi.git
You will need git to work first with apt-get install git
After that you should attach a filter on GPIO#4 to get clear signals and there you go...
See also http://m0xpd.blogspot.nl/2013/01/raspbe … spers.html for more information.