Noise, especially man-made interference from electronic devices, tends to have a great effect on the HF bands. In recent years, concerns have risen among certain users of the HF spectrum over "broadband over power lines" (BPL) Internet access, which has an almost destructive effect on HF communications. This is due to the frequencies on which BPL operates (typically corresponding with the HF band) and the tendency for the BPL signal to leak from power lines. Some BPL providers have installed notch filters to block out certain portions of the spectrum (namely the amateur radio bands), but a great amount of controversy over the deployment of this access method remains. Other electronic devices including plasma televisions can also have a detrimental effect on the HF spectrum.
Noise especially man-made interference from electronic devices tends to have a great effect on the HF bands In recent years concerns have risen among certain users of the HF spectrum over "broadband over power lines" (BPL) Internet access which has an almost destructive effect on HF communications This is due to the frequencies on which BPL operates (typically corresponding with the HF band) and the tendency for the BPL signal to leak from power lines Some BPL providers have installed notch filters to block out certain portions of the spectrum (namely the amateur radio bands) but a great amount of controversy over the deployment of this access method remains Other electronic devices including plasma televisions can also have a detrimental effect on the HF spectrum