The heat from these bubbles transfers to the pool water, and can raise the water temperature by up to 15 degrees Fahrenheit. Once the pool water has been heated, Solar Covers are great for maintaining a pleasant water temperature long after the sun has set and the air has cooled down. Solar Covers do this by preventing heat loss through evaporation, which accounts for 70% of a poolâs heat loss.
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to the waveform being transmitted. That waveform may, for instance, correspond to the sounds to be reproduced by a loudspeaker, or the light intensity of television pixels.
How HD Radio Works. The radio waves that carry analog AM and FM signals are limited in the amount of information they can convey, both because of the nature of the waves themselves and the spacing of stations on the frequency band. FM stations are separated by 200 kHz, while AM stations have just 10 kHz between them. Alternate channel spacing of FM stations gives them 400 kHz to work with. The signals broadcast by radio stations are actually spread out on either side of the frequency into Upper and Lower Sidebands (USB and LSB).