On 2 of my 3 KiwiSDRs I have been running the wsprdaemon script to decode WSPR 24/7 on 14 bands from 2200-10m. The latest release (2.5a) is able to perform a receiver noise reading while collecting the 2 minute WSPR signal sample.
It produces calibrated noise charts for each band with the parameters of noise level in dBm in 1Hz and Temperature in K. Example below:
As far as the interpretation of the graphs is concerned, it’s a learning curve. Diurnal background noise level changes are a good sign for an effective receiving system. I noted on a previous post that I thought that my 30m WSPR reception was affected by vDSL – a look at the 30m chart shows no diurnal variation and has the highest dBm figure.
There is a website which has some other receivers results online, and this will prove very useful when more are added: