Previous implementation was very opaque and very odd.

This implementation follows the detail described in from the following
web site, and is hopefully much less opaque.

http://elektronikforumet.com/wiki/index.php/RF_Protokoll_-_Nexa/Proove_%28%C3%A4ldre,_ej_sj%C3%A4lvl%C3%A4rande%29