WSPR

Recently, I have been using 200mW WSPR on 10m and 630m WSPR RX. I have been pleasantly surprised how well it works.  

Many now prefer FT8. I use both, although WSPR works with signals about 10dB weaker and takes up far less spectrum. WSPR is a beaconing mode whereas FT8 can be used for basic QSOs.