Frequencies and what would we do without wikipedia ?

Frequencies[edit]

Main article: Radio spectrum

Frequency	Wavelength	Designation	Abbreviation[5]
3 – 30 Hz	105 – 104 km	Extremely low frequency	ELF
30 – 300 Hz	104 – 103 km	Super low frequency	SLF
300 – 3000 Hz	103 – 100 km	Ultra low frequency	ULF
3 – 30 kHz	100 – 10 km	Very low frequency	VLF
30 – 300 kHz	10 – 1 km	Low frequency	LF
300 kHz – 3 MHz	1 km – 100 m	Medium frequency	MF
3 – 30 MHz	100 – 10 m	High frequency	HF
30 – 300 MHz	10 – 1 m	Very high frequency	VHF
300 MHz – 3 GHz	1 m – 10 cm	Ultra high frequency	UHF
3 – 30 GHz	10 – 1 cm	Super high frequency	SHF
30 – 300 GHz	1 cm – 1 mm	Extremely high frequency	EHF
300 GHz - 3000 GHz	1 mm - 0.1 mm	Tremendously high frequency	THF

The inverse relation between frequency and wavelength deduces that the higher the frequency of the RF Signal, the smaller its wavelength and vice versa. Thus, under similar conditions of propagation, the higher frequency signal attenuates faster than the lower frequency signal and becomes too weak to be detected at the end of the receiver, located at larger distances. An RF power amplifier is used to amplify the power level of such a transmitter RF Signal, so that it can travel larger distances with less attenuation.

Wifi is 2.4 GHZ,, UHF  our houses are 60 HZ,  is SLFand it is nice to know what you are dealing with,,

attenuateverb |əˈtenyoōˌāt| [ trans. ] (often be attenuated)reduce the force, effect, or value of : her intolerance was attenuated by a rather unexpected liberalism.• reduce the amplitude of (a signal, electric current, or other oscillation).• [ intrans. ] (of a signal, electric current, or other oscillation) be reduced in amplitude.• [usu. as adj. ] ( attenuated) reduce the virulence of (a pathogenic organism or vaccine) : attenuated strains of rabies virus.• reduce in thickness; make thin : the trees are attenuated from being grown too close together.

An RF power amplifier is a type of electronic amplifier used to convert a low-power radio-frequency signal into a larger signal of significant power, typically for driving the antenna of a transmitter. It is usually optimized to have high efficiency, high output Power(P1dB)compression, good return loss on the input and output, good gain, and optimum heat dissipation.

Applications[edit]

The basic applications of the RF power amplifier include driving to another high power source, driving a transmitting antenna and exciting microwave cavity resonators. Among these applications, driving transmitter antennas is most well known. The transmitter–receivers are used not only for voice and data communication but also for weather sensing (in the form of a RADAR).