Changes

==Wavelength==

==Wavelength==

As indicated in the diagram above, the wavelength of a cyclic curve is the distance between adjacent corresponding points - peak to peak, trough to trough etc. For most ham radio applications, wavelength is measured in metres (m), centimetres (cm) or millimetres (mm). This is in fact how the [[Bands | amateur bands]] are described - eg 20m, 70cm etc.

As indicated in the diagram above, the wavelength of a cyclic curve is the distance between adjacent corresponding points - peak to peak, trough to trough etc. For most ham radio applications, wavelength is measured in metres (m), centimetres (cm) or millimetres (mm). This is in fact how the [[Bands|amateur bands]] are described - eg 20m, 70 cm etc.

==Frequency==

==Frequency==

Frequency is the number of corresponding wave points (eg peaks) that pass a stationary point each second. The unit for this is Hertz (HZ) or cycles per second.

Frequency is the number of corresponding wave points (eg peaks) that pass a stationary point each second. The unit for this is Hertz (HZ) or cycles per second.

* 1 [[KHz]] ([[Kilohertz]]) = 1000 Hz

* 1 [[KHz]] ([[Kilohertz]]) = 1000 Hz

* 1 [[MHz]] ([[Megahertz]]) = 1 000 000 Hz

* 1 [[MHz]] ([[Megahertz]]) = 1 000 000 Hz

* 1 [[GHz]] ([[Gigahertz]]) = 1 000 000 000 Hz

* 1 [[GHz]] ([[Gigahertz]]) = 1 000 000 000 Hz

==Period==

==Period==

|-

|-

! Frequency  

! Frequency  

| 1 mHz (10^-3)

| 1 mHz (10⁻³)

| 1 Hz (10⁰)

| 1 Hz (10⁰)

| 1 kHz (10³) || 1 MHz (10⁶)

| 1 kHz (10³) || 1 MHz (10⁶)

| 1 GHz (10⁹) || 1 THz (10¹²)

| 1 GHz (10⁹) || 1 THz (10¹²)

|-

|-

! Period (time)  

! Period (time)  

| 1 ks (10³)

| 1 ks (10³)

| 1 s (10⁰)

| 1 s (10⁰)

| 1 ms (10^-3) || 1 µs (10^-6)

| 1 ms (10⁻³) || 1 µs (10⁻⁶)

| 1 ns (10^-9) || 1 ps (10^-12)

| 1 ns (10⁻⁹) || 1 ps (10⁻¹²)

|}

|}

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

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

if f = 125MHz, the harmonics would be: 2f = 250MHz, 3f = 375MHz, 4f = 500MHz ..... etc

if f = 125 MHz, the harmonics would be: 2f = 250 MHz, 3f = 375 MHz, 4f = 500 MHz ..... etc

==See Also==

==See also==

* [[Modes]]

* [[Modes]]

* [[Propagation]]

* [[Propagation]]