E-Skip - Revision history

TimVK4YEH: added external links

2010-11-10T00:04:15Z

added external links

← Older revision		Revision as of 17:04, 9 November 2010
Line 12:		Line 12:
	* time frames for communications are predictable		* time frames for communications are predictable
	* QSB (fading) is slow and predictable		* QSB (fading) is slow and predictable


	=== At which frequencies does E-Skip occur? ===		=== At which frequencies does E-Skip occur? ===

	E-Skip generally occurs at night in the medium and shortwave [[HF]] parts of the spectrum.		E-Skip generally occurs at night in the medium and shortwave [[HF]] parts of the spectrum.


	===Sporadic E-Skip ===		===Sporadic E-Skip ===
Line 35:		Line 33:
	* fast and unpredictable QSB (fading) events		* fast and unpredictable QSB (fading) events

			===Further reading===

			* [http://www.amfmdx.net/propagation/Es.html Mid latitude sporadic E (ES) - A review]
			* [http://en.wikipedia.org/wiki/TV_and_FM_DX#Sporadic_E_propagation_.28E-skip.29 Wikipedia article]

	{{propagation}}		{{propagation}}

TimVK4YEH: added info about eskip and sporadic eskip. diagram needed?

2010-11-09T09:15:58Z

added info about eskip and sporadic eskip. diagram needed?

← Older revision		Revision as of 02:15, 9 November 2010
Line 5:		Line 5:
	The E-layer is the lowest layer of the atmosphere and can typically be found at altitudes between about 80km and 100km. the E-Layer is characterised by high electron densities, and high temperatures (between 300K and 122K)		The E-layer is the lowest layer of the atmosphere and can typically be found at altitudes between about 80km and 100km. the E-Layer is characterised by high electron densities, and high temperatures (between 300K and 122K)

	E-Skip ~~propogation~~ is the ~~refelection~~ of radio waves off the E-Layer, allowing reception many thousands of kilometres distant from normal reception areas.		E-Skip propagation is the reflection of radio waves off the E-Layer, allowing reception many thousands of kilometres distant from normal reception areas.

			E-Layer communications are characterised by:
			* weaker but longer paths than usual
			* directions for optimal communications, and hence target areas are predictable
			* time frames for communications are predictable
			* QSB (fading) is slow and predictable


	=== At which frequencies does E-Skip occur? ===		=== At which frequencies does E-Skip occur? ===
Line 11:		Line 18:
	E-Skip generally occurs at night in the medium and shortwave [[HF]] parts of the spectrum.		E-Skip generally occurs at night in the medium and shortwave [[HF]] parts of the spectrum.

	===~~What is~~ Sporadic E-Skip? ===
			===Sporadic E-Skip ===

	Sporadic E-skip is associated with scattered regions of especially dense ionisation that occur seasonally within the E-layer. generally it occurs:		Sporadic E-skip is associated with scattered regions of especially dense ionisation that occur seasonally within the E-layer. generally it occurs:
Line 20:		Line 28:
	* at frequencies up to about 150MHz		* at frequencies up to about 150MHz
	* can provide communication over distances up to 2,400Km		* can provide communication over distances up to 2,400Km

			Sporadic E-Skip is characterised by:
			* strong, relatively short paths
			* unpredicatable times
			* unpredictable directions
			* fast and unpredictable QSB (fading) events



	{{propagation}}		{{propagation}}

TimVK4YEH: fixed error in page link

2009-11-14T08:07:30Z

fixed error in page link

← Older revision		Revision as of 01:07, 14 November 2009
Line 1:		Line 1:
	Related wiki pages : [[Propagation]], [[Meteor scatter]], [[Aurora]], [[~~Tropspheric~~ ducting]]		Related wiki pages : [[Propagation]], [[Meteor scatter]], [[Aurora]], [[Tropospheric ducting]]

	==What is it?==		==What is it?==

Carlb: /* What is Sporadic E-Skip? */

2009-04-09T01:35:37Z

What is Sporadic E-Skip?

← Older revision		Revision as of 18:35, 8 April 2009
Line 13:		Line 13:
	===What is Sporadic E-Skip? ===		===What is Sporadic E-Skip? ===

	Sporadic E-skip is associated with scattered regions of especially dense ionisation that occur ~~seasonall~~ within the E-layer. generally it occurs:		Sporadic E-skip is associated with scattered regions of especially dense ionisation that occur seasonally within the E-layer. generally it occurs:

	* daily during the day in equatorial regions		* daily during the day in equatorial regions
Line 20:		Line 20:
	* at frequencies up to about 150MHz		* at frequencies up to about 150MHz
	* can provide communication over distances up to 2,400Km		* can provide communication over distances up to 2,400Km


			{{propagation}}

TimVK4YEH: /* What is Sporadic E-Skip? */

2008-08-13T09:15:36Z

What is Sporadic E-Skip?

← Older revision		Revision as of 02:15, 13 August 2008
Line 19:		Line 19:
	* in association with auroras in Polar regions		* in association with auroras in Polar regions
	* at frequencies up to about 150MHz		* at frequencies up to about 150MHz
	8 over distances up to 2,400Km		* can provide communication over distances up to 2,400Km

TimVK4YEH: brief info and internal links - needs expanding

2008-08-13T09:14:52Z

brief info and internal links - needs expanding

New page

Related wiki pages : [[Propagation]], [[Meteor scatter]], [[Aurora]], [[Tropspheric ducting]]

==What is it?==

The E-layer is the lowest layer of the atmosphere and can typically be found at altitudes between about 80km and 100km. the E-Layer is characterised by high electron densities, and high temperatures (between 300K and 122K)

E-Skip propogation is the refelection of radio waves off the E-Layer, allowing reception many thousands of kilometres distant from normal reception areas.

=== At which frequencies does E-Skip occur? ===

E-Skip generally occurs at night in the medium and shortwave [[HF]] parts of the spectrum.

===What is Sporadic E-Skip? ===

Sporadic E-skip is associated with scattered regions of especially dense ionisation that occur seasonall within the E-layer. generally it occurs:

* daily during the day in equatorial regions
* commonly in temperate regions in late spring, early summer and sometimes in early winter
* in association with auroras in Polar regions
* at frequencies up to about 150MHz
8 over distances up to 2,400Km