Radio Frequency and electrical signals

Click For Summary

Discussion Overview

The discussion revolves around the concept of radio frequency (RF) and its relationship with electrical signals, including how these signals produce and detect radio waves. Participants explore the necessity of RF in various applications and seek clarification on the nature of signals.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants inquire about the mechanisms by which electrical signals produce and detect radio waves.
  • Others mention the utility of RF in applications such as radio, microwaves, and satellite communications.
  • A participant critiques a quoted definition of RF as being loose and confusing, suggesting that context is important for understanding.
  • There is a viewpoint that electrical signals and electromagnetic waves are fundamentally similar, with electrical oscillations being a form of guided electromagnetic waves.
  • One participant describes a signal as a means of conveying information, highlighting various forms of information transmission including electrical signals, sound, and optical methods.
  • Another participant notes that RF frequencies are advantageous because they can be effectively launched and retrieved using antennas and processed by existing electronic technologies.

Areas of Agreement / Disagreement

Participants express differing views on the clarity of definitions and the nature of signals, indicating that there is no consensus on these points. The discussion remains unresolved regarding the best way to articulate the relationship between electrical signals and radio waves.

Contextual Notes

Some statements rely on broad definitions and may lack specific context, leading to potential misunderstandings. The discussion does not resolve the complexities of how electrical signals relate to electromagnetic waves.

hasan_researc
Messages
166
Reaction score
0
"Radio frequency (RF) is a rate of oscillation in the range of about 30 kHz to 300 GHz, which corresponds to the frequency of electrical signals normally used to produce and detect radio waves." - Quoted from Wikipedia.

How can electrical signals be used to produce and detect radio waves?
What do we need RF for those purposes?
What is a signal anyway?

Thanks in advance for any help!:smile:
 
Engineering news on Phys.org
hasan_researc said:
"Radio frequency (RF) is a rate of oscillation in the range of about 30 kHz to 300 GHz, which corresponds to the frequency of electrical signals normally used to produce and detect radio waves." - Quoted from Wikipedia.

How can electrical signals be used to produce and detect radio waves?
What do we need RF for those purposes?
What is a signal anyway?

Thanks in advance for any help!:smile:
You don't specify where, in Wikipedia, that quote came from but it is a very loose and confusing statement. Possibly the context would make it better(?).

Electrical signals are not, in face, any different from electromagnetic waves in space. An electrical oscillation (even 50Hz AC) is transmitted along a wire in what is, in fact, a 'guided' electromagnetic wave of very long wavelength. So a transmitter (or receiver, etc. ) is only a device for interfacing between a signal within an electronic circuit (guided waves) and space (free waves), via some form of amplifier / antenna.

A signal, "by the way", is just information (in the most general terms). You can carry information (a signal - the original meaning), written on a paper, via sound / speech or using the variations of an electric current - such as what comes from a microphone. There are many forms of information transmission and, nowadays, the vast majority of information (in terms of sheer quantity) is transferred as electrical signals on wires, radio waves or optically, along fibres.

The reason that RF frequencies are used is that em waves at these frequencies can be launched and retrieved using antennae and generated / processed / detected by available electronic equipment technologies. These days, light is also used, of course.
 

Similar threads

  • · Replies 14 ·
Replies
14
Views
6K
Replies
15
Views
2K
  • · Replies 45 ·
2
Replies
45
Views
6K
  • · Replies 14 ·
Replies
14
Views
3K
  • · Replies 68 ·
3
Replies
68
Views
6K
  • · Replies 3 ·
Replies
3
Views
2K
Replies
26
Views
3K
  • · Replies 1 ·
Replies
1
Views
7K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 12 ·
Replies
12
Views
2K