Multi-location long-term HF noise measurements and comparison to ITU-R P.372-8

The Signal to Noise Enhancement Program (SNEP) has a 25-year history of making noise and interference measurements at communications receivers. This paper describes SNEP´s latest measurement system and analytical techniques used to quantify communications facility performance. The analytical methods include techniques to identify noise from specific sources, such as power-line frequency related sources. This paper presents noise floor estimates from many facilities, and it includes some measurements taken continuously for several months.