Amateur Radio Wiki - User contributions [en]

File:Harmonics.png

2015-04-26T17:25:38Z

Nojiratz: Nojiratz uploaded a new version of "File:Harmonics.png"

Harmonics

2015-04-26T17:24:59Z

Nojiratz: /* What is a harmonic? */

==What is a harmonic?==

A harmonic of a particular frequency (the fundamental frequency '''f''') is a frequency that is an integer multiple of the first one. For example:

if f = 125 MHz, the harmonics would be:

1st harmonic = 1f = 125 MHz

2nd harmonic = 2f = 250 MHz

3rd harmonic = 3f = 375 MHz

4th harmonic = 4f = 500 MHz

..... etc.

In the diagram below it can be seen that harmonics share common nodes.

[[Image:Harmonics.png |450px]]

Mathematically, the basic wave equation is:

<math> \mathit{v}=\mathit{f}\times \lambda </math>

''v'' is the velocity of the wave in metres per second - a constant close to the speed of light for radio waves in the atmosphere.

''f'' is the frequency of the wave - how many cycles pass a fixed point per second

<math> \lambda </math> is the wavelength of the wave in metres - the distance between two peaks of the wave.

So, as the frequency increases, the wavelength decreases - a doubling of frequency causes a halving of wavelength etc.

==Where do harmonics come from?==

==Why are harmonics bad?==

==How do you get rid of harmonics?==

==External links==

== See also ==

* [[Antennas]]
* [[Propagation]]
* [[Interference]]
* [[Gain]]
* [[SWR]]
* [[Frequency Wavelength and Period]]

{{electronics}}

Harmonics

2015-04-26T16:50:03Z

Nojiratz: /* What is a harmonic? */

==What is a harmonic?==

A harmonic of a particular frequency (the fundamental frequency '''f''') is a frequency that is an integer multiple of the first one. For example:

if f = 125 MHz, the harmonics would be:

1st harmonic = 1f = 125 MHz

2nd harmonic = 2f = 250 MHz

3rd harmonic = 3f = 375 MHz

4th harmonic = 4f = 500 MHz

..... etc.

In the diagram below it can be seen that harmonics share common nodes.

[[File:Harmonics.png |450px]]

Mathematically, the basic wave equation is:

<math> \mathit{v}=\mathit{f}\times \lambda </math>

''v'' is the velocity of the wave in metres per second - a constant close to the speed of light for radio waves in the atmosphere.

''f'' is the frequency of the wave - how many cycles pass a fixed point per second

<math> \lambda </math> is the wavelength of the wave in metres - the distance between two peaks of the wave.

So, as the frequency increases, the wavelength decreases - a doubling of frequency causes a halving of wavelength etc.

==Where do harmonics come from?==

==Why are harmonics bad?==

==How do you get rid of harmonics?==

==External links==

== See also ==

* [[Antennas]]
* [[Propagation]]
* [[Interference]]
* [[Gain]]
* [[SWR]]
* [[Frequency Wavelength and Period]]

{{electronics}}

Harmonics

2015-04-26T16:42:09Z

Nojiratz: Updated the Harmonics graphic

File:Harmonics.png

2015-04-26T16:40:33Z

Nojiratz:

Harmonics

2015-04-20T16:16:35Z

Nojiratz:

==What is a harmonic?==

A harmonic of a particular frequency (the fundamental frequency '''f''') is a frequency that is an integer multiple of the first one. For example:

if f = 125 MHz, the harmonics would be:

1st harmonic = 1f = 125 MHz

2nd harmonic = 2f = 250 MHz

3rd harmonic = 3f = 375 MHz

4th harmonic = 4f = 500 MHz

..... etc.

In the diagram below it can be seen that harmonics share common nodes.

[[Image:Vk4yeh_harmonics.jpg |450px]]

(this diagram is mislabeled, since 2f should be the 2nd harmonic, etc.)

Mathematically, the basic wave equation is:

<math> \mathit{v}=\mathit{f}\times \lambda </math>

''v'' is the velocity of the wave in metres per second - a constant close to the speed of light for radio waves in the atmosphere.

''f'' is the frequency of the wave - how many cycles pass a fixed point per second

<math> \lambda </math> is the wavelength of the wave in metres - the distance between two peaks of the wave.

So, as the frequency increases, the wavelength decreases - a doubling of frequency causes a halving of wavelength etc.

==Where do harmonics come from?==

==Why are harmonics bad?==

==How do you get rid of harmonics?==

==External links==

== See also ==

* [[Antennas]]
* [[Propagation]]
* [[Interference]]
* [[Gain]]
* [[SWR]]
* [[Frequency Wavelength and Period]]

{{electronics}}

Harmonics

2015-04-20T16:14:53Z

Nojiratz:

==What is a harmonic?==

A harmonic of a particular frequency (the fundamental frequency '''f''') is a frequency that is an integer multiple of the first one. For example:

if f = 125 MHz, the harmonics would be:

1st harmonic = 1f = 125 MHz
2nd harmonic = 2f = 250 MHz
3rd harmonic = 3f = 375 MHz
4th harmonic = 4f = 500 MHz
..... etc.

In the diagram below it can be seen that harmonics share common nodes.

[[Image:Vk4yeh_harmonics.jpg |450px]]
(this diagram is mislabeled, since 2f should be the 2nd harmonic)

Mathematically, the basic wave equation is:

<math> \mathit{v}=\mathit{f}\times \lambda </math>

''v'' is the velocity of the wave in metres per second - a constant close to the speed of light for radio waves in the atmosphere.

''f'' is the frequency of the wave - how many cycles pass a fixed point per second

<math> \lambda </math> is the wavelength of the wave in metres - the distance between two peaks of the wave.

So, as the frequency increases, the wavelength decreases - a doubling of frequency causes a halving of wavelength etc.

==Where do harmonics come from?==

==Why are harmonics bad?==

==How do you get rid of harmonics?==

==External links==

== See also ==

* [[Antennas]]
* [[Propagation]]
* [[Interference]]
* [[Gain]]
* [[SWR]]
* [[Frequency Wavelength and Period]]

{{electronics}}

Harmonics

2015-04-20T16:13:53Z

Nojiratz: /* What is a harmonic? */ Addition of harmonic examples delineation

==What is a harmonic?==

An harmonic of a particular frequency (the fundamental frequency '''f''') is a frequency that is an integer multiple of the first one. For example:

if f = 125 MHz, the harmonics would be:

1st harmonic = 1f = 125 MHz
2nd harmonic = 2f = 250 MHz
3rd harmonic = 3f = 375 MHz
4th harmonic = 4f = 500 MHz
..... etc.

In the diagram below it can be seen that harmonics share common nodes.

[[Image:Vk4yeh_harmonics.jpg |450px]]
(this diagram is mislabeled, since 2f should be the 2nd harmonic)

Mathematically, the basic wave equation is:

<math> \mathit{v}=\mathit{f}\times \lambda </math>

''v'' is the velocity of the wave in metres per second - a constant close to the speed of light for radio waves in the atmosphere.

''f'' is the frequency of the wave - how many cycles pass a fixed point per second

<math> \lambda </math> is the wavelength of the wave in metres - the distance between two peaks of the wave.

So, as the frequency increases, the wavelength decreases - a doubling of frequency causes a halving of wavelength etc.

==Where do harmonics come from?==

==Why are harmonics bad?==

==How do you get rid of harmonics?==

==External links==

== See also ==

* [[Antennas]]
* [[Propagation]]
* [[Interference]]
* [[Gain]]
* [[SWR]]
* [[Frequency Wavelength and Period]]

{{electronics}}