QRN - Revision history

TimVK4YEH: internal link

2010-11-20T04:03:34Z

internal link

← Older revision		Revision as of 21:03, 19 November 2010
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	# '''Atmospheric noise'''. This originates in the atmosphere. Lightning creates RF noise over a wide range of frequencies (usually between 100 kHz to 20 MHz) that affects radio transmissions over hundreds of km. Auroral discharges over polar regions generally create noise at lower frequencies (below 0.1 MHz).		# '''Atmospheric noise'''. This originates in the atmosphere. Lightning creates RF noise over a wide range of frequencies (usually between 100 kHz to 20 MHz) that affects radio transmissions over hundreds of km. Auroral discharges over polar regions generally create noise at lower frequencies (below 0.1 MHz).
	# '''Geological activity'''. Increased RF noise has been recorded as a precursor to earthquakes, and near erupting volcanoes		# '''Geological activity'''. Increased RF noise has been recorded as a precursor to earthquakes, and near erupting volcanoes
	# '''Cosmic noise'''. This comes from a source outside the Earth's atmosphere. The sun produces noise that reaches a maximum at 11 year intervals (the so-called solar cycle). The planet Jupiter produces large amounts of RF noise in the 16 to 24 MHz range. Stars and galaxies also contribute to cosmic noise.		# '''Cosmic noise'''. This comes from a source outside the Earth's atmosphere. The sun produces noise that reaches a maximum at 11 year intervals (the so-called solar or [[Sunspot Cycle \| sunspot]] cycle). The planet Jupiter produces large amounts of RF noise in the 16 to 24 MHz range. Stars and galaxies also contribute to cosmic noise.
	# '''[http://www.w8pgw.org/node/95 Snow Static]''' yes, snow static! The link provides some detail about this unusual phenomenon		# '''[http://www.w8pgw.org/node/95 Snow Static]''' yes, snow static! The link provides some detail about this unusual phenomenon

TheAnarcat at 00:13, 10 November 2010

2010-11-10T00:13:01Z

← Older revision		Revision as of 17:13, 9 November 2010
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	Strictly speaking QRN means "noise from natural sources" as opposed to [[QRM]] which means "man-made noise". The abbreviation QRN is oftern used in in general terms to mean any noise that interferes with propagation or reception of transmissions.		Strictly speaking QRN means "noise from natural sources" as opposed to [[QRM]] which means "man-made noise". The abbreviation QRN is oftern used in in general terms to mean any noise that [[interference\|interferes]] with propagation or reception of transmissions.

	QRN is higher on the long wavelength bands (160, 80, 40), especially at night.		QRN is higher on the long wavelength bands (160, 80, 40), especially at night.

TheAnarcat: merge "what causes qrn" here

2010-11-10T00:04:40Z

merge "what causes qrn" here

← Older revision		Revision as of 17:04, 9 November 2010
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	QRN is "natural ~~interference~~", as opposed to [[QRM]] - "man-made ~~interference~~".		Strictly speaking QRN means "noise from natural sources" as opposed to [[QRM]] which means "man-made noise". The abbreviation QRN is oftern used in in general terms to mean any noise that interferes with propagation or reception of transmissions.

	QRN is higher on the long wavelength bands (160, 80, 40), especially at night.		QRN is higher on the long wavelength bands (160, 80, 40), especially at night.

	[[What causes QRN?]]		== What causes QRN? ==

			# '''Atmospheric noise'''. This originates in the atmosphere. Lightning creates RF noise over a wide range of frequencies (usually between 100 kHz to 20 MHz) that affects radio transmissions over hundreds of km. Auroral discharges over polar regions generally create noise at lower frequencies (below 0.1 MHz).
			# '''Geological activity'''. Increased RF noise has been recorded as a precursor to earthquakes, and near erupting volcanoes
			# '''Cosmic noise'''. This comes from a source outside the Earth's atmosphere. The sun produces noise that reaches a maximum at 11 year intervals (the so-called solar cycle). The planet Jupiter produces large amounts of RF noise in the 16 to 24 MHz range. Stars and galaxies also contribute to cosmic noise.
			# '''[http://www.w8pgw.org/node/95 Snow Static]''' yes, snow static! The link provides some detail about this unusual phenomenon

			== See also ==

			* [[Propagation]]
			* [[BPL]]


			==External links==
			* [http://web.archive.org/web/20050924150424/www.arrl.org/tis/info/HTML/rfi-noise/ ARRL noise identification site]


	{{propagation}}		{{propagation}}

Carlb at 01:37, 9 April 2009

2009-04-09T01:37:15Z

← Older revision		Revision as of 18:37, 8 April 2009
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	[[What causes QRN?]]		[[What causes QRN?]]


			{{propagation}}

TimVK4YEH at 10:33, 5 July 2008

2008-07-05T10:33:41Z

← Older revision		Revision as of 03:33, 5 July 2008
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	QRN is higher on the long wavelength bands (160, 80, 40), especially at night.		QRN is higher on the long wavelength bands (160, 80, 40), especially at night.

	[[What causes QRN]]		[[What causes QRN?]]

G7VRD at 13:14, 8 June 2008

2008-06-08T13:14:14Z

← Older revision		Revision as of 06:14, 8 June 2008
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	QRN is "natural interference", as opposed to QRM - "man-made interference".		QRN is "natural interference", as opposed to [[QRM]] - "man-made interference".

	QRN is higher on the long wavelength bands (160, 80, 40), especially at night.		QRN is higher on the long wavelength bands (160, 80, 40), especially at night.

	[[What causes QRN]]		[[What causes QRN]]

G7VRD: New page: QRN is "natural interference", as opposed to QRM - "man-made interference". QRN is higher on the long wavelength bands (160, 80, 40), especially at night. What causes QRN

2008-06-08T13:14:01Z

New page: QRN is "natural interference", as opposed to QRM - "man-made interference". QRN is higher on the long wavelength bands (160, 80, 40), especially at night. What causes QRN

New page

QRN is "natural interference", as opposed to QRM - "man-made interference".

QRN is higher on the long wavelength bands (160, 80, 40), especially at night.

[[What causes QRN]]