What is radio frequency receiver?

Answer 1

The definition of what it is, is actually in your question. It's a receiver that operates in the radio frequency spectrum. Anything that has a transmitter is said to transmit in radio frequency or `RF`. The term radio is short for radiotelegraphy, which has become generic over the years.

Where does the radio frequency start? Technically, it' at 10,000 hz and higher. That's not to say that there's lower frequency transmitters (The U.S. Gov't uses 2 hz. to reach our submarines when they're under water, but that's more of an exception than the rule. The radio frequency spectrum can extend into the gigahertz range for things such as satellite communications, and as our technology advances, we could eventually see frequencies in the teraherts.

So a radio frequency receiver is anything that will receive a a frequency in the radio frequency range.

Hope this helps,

Cubby

Answer 2

RF stands for Radio Frequency

When you receive on a Radio Frequency, you simply "listen" to the data on a particular radio frequency.

This can be a radio program with speech or music.

The actual purpose of the RF Transmitter is to transform audible frequencies so high up in frequency so that they become electromagnetic waves instead. This is the characteristics of ALL RadioWaves. Electromagnetic wavelengts of energy.

There are TWO commonly known methods of doing this FrequencyTransformation.

AmplitudeModulation: where one amplifies the transmitted energy on a fixed frequency according to the amplitude of the audible signal.

FrequencyModulation: where one keep the transmitted energy on a fixed current and then vary the frequency slightly according to the amplitude of the audible signal.

FrequencyModulation is in most cases preferable because one can then simply adjust the current down for small range and up for large range. Quite easy to do.

The purpose of a RF Receiver is to "decode"

In an FM Receiver it simply transform the frequency-variations of a set base frequency back to an audible frequency.

Then we use an Amplifier to enlarge this signal so that we can listen to it from a loudspeaker.

There are "other" methods of actually encode a signal for transmittion that will accordingly need a reverse method for decoding signal again.

Mainly used to transmit encoded data, but the principles are the same and one can use both methods for this.

One use different frequencies for different purposes.

Some frequencies are reflected better due to atmospheric conditions and can have a very very long range with little power. (Low frequencies)

Other frequencies are better for very short range but provide the ability for massive amounts of data.(Very High Frequencies)

As a baseline, the higher the frequency, the more information you can send in one frame of time (IE 1 second).

This does not mean that the speed of the magnetic waves of the higer frequencies move faster, they just shift/switch polarity faster.

Magnetic waves all move at the speed of light (in vacum).

Regards.