S - Revision history

QSO: /* S */ Added "squelch"

2014-06-07T14:54:25Z

S: Added "squelch"

← Older revision		Revision as of 07:54, 7 June 2014
Line 28:		Line 28:

	'''[[ E-Skip \| Sporadic E-Skip]]''': Unexpected and unpredictable propagation using refraction in the E Layer.		'''[[ E-Skip \| Sporadic E-Skip]]''': Unexpected and unpredictable propagation using refraction in the E Layer.

			'''[[Squelch]]''' : A user-adjustable electronic circuit in a [[receiver]] or [[transceiver]] which masks unwanted noise in the absence of a signal.

	'''SSB''' : Single Sideband. A transmission mode used mainly in the HF bands.		'''SSB''' : Single Sideband. A transmission mode used mainly in the HF bands.

TimVK4YEH: added semiconductor

2010-12-19T07:02:04Z

added semiconductor

← Older revision		Revision as of 00:02, 19 December 2010
Line 2:		Line 2:

	==S==		==S==

			'''[[Semiconductor \| Semiconductor]]''' : an element that is normally an insulator but which can, under certain physical conditions, be made to conduct.

	'''Series circuit''': Usually used to describe tuned circuits in which the capacitive and inductive elements are in series with each other.		'''Series circuit''': Usually used to describe tuned circuits in which the capacitive and inductive elements are in series with each other.

TimVK4YEH: added sporadic e skip

2010-11-09T09:26:31Z

added sporadic e skip

← Older revision		Revision as of 02:26, 9 November 2010
Line 24:		Line 24:

	'''Split operation''' : Direct communications where transmit and receive are offset from each other in frequency - most often used by [[DXpedition]] stations which must accommodate large numbers of incoming calls.		'''Split operation''' : Direct communications where transmit and receive are offset from each other in frequency - most often used by [[DXpedition]] stations which must accommodate large numbers of incoming calls.

			'''[[ E-Skip \| Sporadic E-Skip]]''': Unexpected and unpredictable propagation using refraction in the E Layer.

	'''SSB''' : Single Sideband. A transmission mode used mainly in the HF bands.		'''SSB''' : Single Sideband. A transmission mode used mainly in the HF bands.

TheAnarcat at 01:25, 14 October 2010

2010-10-14T01:25:18Z

← Older revision		Revision as of 18:25, 13 October 2010
Line 15:		Line 15:
	'''Skip Distance''' : The shortest distance, for a fixed frequency, between transmitter and receiver.		'''Skip Distance''' : The shortest distance, for a fixed frequency, between transmitter and receiver.

	'''Skip Zone''' : The distance between the point of no reception and the closest point of reception.		'''[[Skip Zone]]''' : The distance between the point of no reception and the closest point of reception.

	'''S meter''' : A meter on a receiver that displays the relative strength of an incoming signal.		'''S meter''' : A meter on a receiver that displays the relative strength of an incoming signal.

TimVK4YEH: sota

2009-08-19T07:23:22Z

sota

← Older revision		Revision as of 00:23, 19 August 2009
Line 20:		Line 20:

	'''SNP''', '''SNPF''' : Shared non-protected pair, shared non-protected frequency. In [[repeater]] coordination, an input/output frequency pair on which no fixed/permanent repeater stations have been deployed. These frequencies remain available for temporary use only within a very limited coverage area by portable public service, emergency, search and rescue operations or short experiments. Individual temporary repeaters on these frequencies are not regionally-coordinated, so are not protected from mutual interference with other temporary repeaters on the same frequency.<sup>[http://www.wnysorc.org/_docs/WNYSORC_SNPF_DEF.pdf]</sup>		'''SNP''', '''SNPF''' : Shared non-protected pair, shared non-protected frequency. In [[repeater]] coordination, an input/output frequency pair on which no fixed/permanent repeater stations have been deployed. These frequencies remain available for temporary use only within a very limited coverage area by portable public service, emergency, search and rescue operations or short experiments. Individual temporary repeaters on these frequencies are not regionally-coordinated, so are not protected from mutual interference with other temporary repeaters on the same frequency.<sup>[http://www.wnysorc.org/_docs/WNYSORC_SNPF_DEF.pdf]</sup>

			'''SOTA''' : [[International_Events#Summits_on_the_Air \| Summits On The Air]]. An [[International Events \| international event]] in which operators gain points from contacts to and from mountain summits over 500m.

	'''Split operation''' : Direct communications where transmit and receive are offset from each other in frequency - most often used by [[DXpedition]] stations which must accommodate large numbers of incoming calls.		'''Split operation''' : Direct communications where transmit and receive are offset from each other in frequency - most often used by [[DXpedition]] stations which must accommodate large numbers of incoming calls.

TimVK4YEH: /* S */

2009-07-01T07:01:32Z

← Older revision		Revision as of 00:01, 1 July 2009
Line 34:		Line 34:

	'''Susceptance''' : the reciprocal of [[Reactance]], measured in Siemens; symbol S		'''Susceptance''' : the reciprocal of [[Reactance]], measured in Siemens; symbol S

	'''[[SWL]]''' : Shortwave listener. While SWL's do not operate licensed transmitting stations, some are using equipment capable of receiving both radioamateur and broadcast signals. For both, SWL's may submit reception reports in order to receive [[QSL]] cards. On VHF/UHF and above, one who can receive (but not transmit) is a scanner operator.		'''[[SWL]]''' : Shortwave listener. While SWL's do not operate licensed transmitting stations, some are using equipment capable of receiving both radioamateur and broadcast signals. For both, SWL's may submit reception reports in order to receive [[QSL]] cards. On VHF/UHF and above, one who can receive (but not transmit) is a scanner operator.

	'''[[SWR]]''' : Standing Wave Ratio. The ratio of the height of a standing wave on a transmission line to the height of an adjacent node.		'''[[SWR]]''' : Standing Wave Ratio. The ratio of the height of a standing wave on a transmission line to the height of an adjacent node.

TimVK4YEH: susceptance

2009-07-01T07:00:48Z

susceptance

← Older revision		Revision as of 00:00, 1 July 2009
Line 33:		Line 33:
	'''[[Sunspot Cycle]]''' : A cycle of approximately 11 years in which the number of sunspots increases and decreases. The broader sunspot cycle is 22 years as the polarity of the sunspots reverses every 11 years.		'''[[Sunspot Cycle]]''' : A cycle of approximately 11 years in which the number of sunspots increases and decreases. The broader sunspot cycle is 22 years as the polarity of the sunspots reverses every 11 years.

			'''Susceptance''' : the reciprocal of [[Reactance]], measured in Siemens; symbol S
	'''[[SWL]]''' : Shortwave listener. While SWL's do not operate licensed transmitting stations, some are using equipment capable of receiving both radioamateur and broadcast signals. For both, SWL's may submit reception reports in order to receive [[QSL]] cards. On VHF/UHF and above, one who can receive (but not transmit) is a scanner operator.		'''[[SWL]]''' : Shortwave listener. While SWL's do not operate licensed transmitting stations, some are using equipment capable of receiving both radioamateur and broadcast signals. For both, SWL's may submit reception reports in order to receive [[QSL]] cards. On VHF/UHF and above, one who can receive (but not transmit) is a scanner operator.

	'''[[SWR]]''' : Standing Wave Ratio. The ratio of the height of a standing wave on a transmission line to the height of an adjacent node.		'''[[SWR]]''' : Standing Wave Ratio. The ratio of the height of a standing wave on a transmission line to the height of an adjacent node.

Carlb: /* S */

2009-06-18T14:24:14Z

← Older revision		Revision as of 07:24, 18 June 2009
Line 8:		Line 8:

	'''Simplex''' : Transmit and receive on the same frequency - most often used when communicating directly (not used when operating via voice repeaters).		'''Simplex''' : Transmit and receive on the same frequency - most often used when communicating directly (not used when operating via voice repeaters).

			'''SK''' : Silent Key, a term used in memory of a deceased radio operator. The <span style="text-decoration: overline">SK</span> [[Morse code#Prosign\|prosign]] in [[Morse code]] indicates the end of a message.

	'''Skip''' : Skip is a radio phenomenon in which signals are reflected or refracted by the atmosphere and return to earth in unexpected places, far away from the normal reception zones. In between transmitter and receiver there is a zone where no transmissions can be heard		'''Skip''' : Skip is a radio phenomenon in which signals are reflected or refracted by the atmosphere and return to earth in unexpected places, far away from the normal reception zones. In between transmitter and receiver there is a zone where no transmissions can be heard
Line 31:		Line 33:
	'''[[Sunspot Cycle]]''' : A cycle of approximately 11 years in which the number of sunspots increases and decreases. The broader sunspot cycle is 22 years as the polarity of the sunspots reverses every 11 years.		'''[[Sunspot Cycle]]''' : A cycle of approximately 11 years in which the number of sunspots increases and decreases. The broader sunspot cycle is 22 years as the polarity of the sunspots reverses every 11 years.

	'''[[SWL]]''' : Shortwave listener. While SWL's do not operate licensed transmitting stations, in some ~~cases they will be~~ using equipment capable of receiving both radioamateur and broadcast signals. For both, SWL's may submit reception reports in order to receive [[QSL]] cards. ~~A similar capability exists on~~ VHF/UHF and above ~~for scanner operators;~~ one ~~need~~ not ~~already be the~~ operator ~~of a licensed station to merely listen and observe on any of the radioamateur bands~~.		'''[[SWL]]''' : Shortwave listener. While SWL's do not operate licensed transmitting stations, some are using equipment capable of receiving both radioamateur and broadcast signals. For both, SWL's may submit reception reports in order to receive [[QSL]] cards. On VHF/UHF and above, one who can receive (but not transmit) is a scanner operator.

	'''[[SWR]]''' : Standing Wave Ratio. The ratio of the height of a standing wave on a transmission line to the height of an adjacent node.		'''[[SWR]]''' : Standing Wave Ratio. The ratio of the height of a standing wave on a transmission line to the height of an adjacent node.

Carlb: /* S */

2009-06-18T03:14:44Z

← Older revision		Revision as of 20:14, 17 June 2009
Line 16:		Line 16:

	'''S meter''' : A meter on a receiver that displays the relative strength of an incoming signal.		'''S meter''' : A meter on a receiver that displays the relative strength of an incoming signal.

			'''SNP''', '''SNPF''' : Shared non-protected pair, shared non-protected frequency. In [[repeater]] coordination, an input/output frequency pair on which no fixed/permanent repeater stations have been deployed. These frequencies remain available for temporary use only within a very limited coverage area by portable public service, emergency, search and rescue operations or short experiments. Individual temporary repeaters on these frequencies are not regionally-coordinated, so are not protected from mutual interference with other temporary repeaters on the same frequency.<sup>[http://www.wnysorc.org/_docs/WNYSORC_SNPF_DEF.pdf]</sup>

	'''Split operation''' : Direct communications where transmit and receive are offset from each other in frequency - most often used by [[DXpedition]] stations which must accommodate large numbers of incoming calls.		'''Split operation''' : Direct communications where transmit and receive are offset from each other in frequency - most often used by [[DXpedition]] stations which must accommodate large numbers of incoming calls.

Carlb: /* S */

2009-06-13T23:36:17Z

← Older revision		Revision as of 16:36, 13 June 2009
Line 15:		Line 15:
	'''Skip Zone''' : The distance between the point of no reception and the closest point of reception.		'''Skip Zone''' : The distance between the point of no reception and the closest point of reception.

	'''S meter''' : A meter on a receiver that displays the relative ~~srength~~ of an incoming signal.		'''S meter''' : A meter on a receiver that displays the relative strength of an incoming signal.

	'''Split operation''' : Direct communications where transmit and receive are offset from each other in frequency - most often used by [[DXpedition]] stations which must accommodate large numbers of incoming calls.		'''Split operation''' : Direct communications where transmit and receive are offset from each other in frequency - most often used by [[DXpedition]] stations which must accommodate large numbers of incoming calls.
Line 25:		Line 25:
	'''Standing Wave''': The vector sum of two waves - in ham radio, this most usually refers to the forward and reflected waves in a [[Feedlines \| feedline]]		'''Standing Wave''': The vector sum of two waves - in ham radio, this most usually refers to the forward and reflected waves in a [[Feedlines \| feedline]]

	'''Sunspot''' : A region on the sun where an ~~electromangetic~~ "storm" is happening. These have an effect on [[Propagation \| propagation]]		'''Sunspot''' : A region on the sun where an electromagnetic "storm" is happening. These have an effect on [[Propagation \| propagation]]

	'''[[Sunspot Cycle]]''' : A cycle of approximately 11 years in which the number of sunspots increases and decreases. The broader sunspot cycle is 22 years as the polarity of the sunspots reverses every 11 years.		'''[[Sunspot Cycle]]''' : A cycle of approximately 11 years in which the number of sunspots increases and decreases. The broader sunspot cycle is 22 years as the polarity of the sunspots reverses every 11 years.