QRSS refers to the transmission and reception of VERY slow Morse code. Morse code so slow it is intended to be decoded VISIBLY by someone looking at a "waterfall" display on a computer screen.
"Why would anyone want to do that?", you may ask.
For many reasons, but primarily because the very low bandwidth occupied by such very slow Morse code means that these signals can be picked out of the noise very relatively easily using appropriate software and configuration of software, and because of this very low powered QRSS signals can be decoded vast distances away, subject to favourable propagation condition. (Not even QRSS signals can force signals to propagate where the laws of Physics determine otherwise!).
The equipment used to transmit QRSS successfully can be relatively simple and are normally quite low in power, usually less than a watt. They are usually on air continuously for several hours and other QRSS enthusiasts notified by a dedicated Email list server that a QRSS station is on the air so that those running "grabbers" can look out for them.
A QRSS transmitter is often referred to as an "MEPT" which stands for Manned Experimental Propagation Transmitter.
A "grabber" is a term used to describe a piece of software which displays the "waterfall" traces of signals in the QRSS operating
frequency bands. Screen dumps of the displayed output are often uploaded to the internet in real time – this facility
takes everything to a whole different level as enthusiasts all over the globe with internet access are able to participate in the various experiments.
Better still, all of the popular software is completely FREE!
Here is my own grabber page, and Here is information about my own MEPT.
Obviously typing "QRSS" into Google will bring up a lot of information, but here is a small selection of sites I have found particularly interesting and useful.