Satellite uplink and downlink frequencies vary from one transmission source to another, but all must be different from one another in order to avoid interference during transmission. This is due to the waveforms created during signal transmission, as identical frequency transmissions disrupt the distance and clarity of the signal.Continue Reading
In all, there are four commonly used satellite transmission bands. These are Ka, Ku, X and C. Consumer broadcasts and publicly operated companies rely on Ka and Ku bands, which operate between 10.9 and 20 gigahertz downlink. This is referred to as the high frequency band of radio wave transmission, as the waves used to transmit signals are very close together.
The lower frequency X band, between 7.25 and 7.75 GHz downlink, is a low frequency signal used predominantly by military forces for long-range communications. Finally, at the lowest end of the satellite transmission range, the C band operates between 3.7 and 4.2 GHz downlink and is ideal for voice and data transmission because its lower frequency makes it less susceptible to adverse weather conditions. Each of these has its own dedicated uplink frequency which is not utilized by any other transmission source. This allows them to effectively receive and retransmit information without risk of overlap or mixed reception from other signal bands.Learn more about Optics & Waves
Resonance frequencies are the natural frequencies at which it is easiest to get an object to vibrate. While setting up vibrations at other frequencies is possible, they require much more energy and constant input to maintain than a resonance frequency. Most objects have several resonance frequencies, and this property must be taken into account because of their positive, as with musical instruments, or negative, as with bridges, effects.Full Answer >
Humans can generally hear frequencies from 20 to 20,000 hertz. However, under ideal laboratory conditions, humans have been able to hear frequencies as low as 12 hertz. As humans get older or are exposed to loud sounds that damage their hearing, the highest frequency they can hear decreases.Full Answer >
The key difference between infrasonic and ultrasonic waves is that infrasonic waves include sounds emitted at levels below frequencies of noise that can be heard by humans while ultrasonic waves are those that exceed 20 kilohertz, which is the upper limit of human noise perception. Ultrasonic waves are waves that have high amplitudes. These waves are also called micro sound, and exist primarily as longitudinal waves.Full Answer >
Wave interference describes the effects of the meeting of two waves that are travelling on the same plane or medium. The meeting of the waves causes the medium they are travelling in to change into a shape that reflects the net effect of both waves.Full Answer >