1.25 metres - Revision history

Carlb: 220-222 segment has been dropped by radio manufacturers due to its non-availablity stateside

2009-11-16T02:29:20Z

220-222 segment has been dropped by radio manufacturers due to its non-availablity stateside

← Older revision		Revision as of 19:29, 15 November 2009
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	Availability of 222 MHz repeaters varies widely from one US region to another, as the bulk of FM activity is on [[2 metres]] and [[70 centimetres]] with other bands most often used in congested areas where all suitable 2-metre repeater frequency pairs have already been allocated. In California, 222MHz has been used as a means to link multiple repeaters in and around the state.		Availability of 222 MHz repeaters varies widely from one US region to another, as the bulk of FM activity is on [[2 metres]] and [[70 centimetres]] with other bands most often used in congested areas where all suitable 2-metre repeater frequency pairs have already been allocated. In California, 222MHz has been used as a means to link multiple repeaters in and around the state.

	A 220-222 MHz band segment has been reallocated to commercial narrowband land-mobile users in the US, but ~~may be~~ available in portions of Canada. A secondary allocation on 219-220 MHz exists in the US (fixed digital stations only, with stringent restrictions to prevent interference to automated marine services) but is rarely used.		A 220-222 MHz band segment has been reallocated to commercial narrowband land-mobile users in the US, but had been available in portions of Canada. This segment is not tunable on most new radios. A secondary allocation on 219-220 MHz exists in the US (fixed digital stations only, with stringent restrictions to prevent interference to automated marine services) but is rarely used.

	Equipment selection tends to be more limited than on the [[2 metre]] band: a cause for concern in the US radio amateur community as fewer choices for transceivers leads to fewer users on the band, increasing the risk that more of this valuable but underutilised VHF spectrum will be lost to reallocation to commercial land-mobile use.		Equipment selection tends to be more limited than on the [[2 metre]] band: a cause for concern in the US radio amateur community as fewer choices for transceivers leads to fewer users on the band, increasing the risk that more of this valuable but underutilised VHF spectrum will be lost to reallocation to commercial land-mobile use.

Carlb: link Hamtronics R100 module, SLVRC page

2009-06-06T02:08:23Z

link Hamtronics R100 module, SLVRC page

← Older revision		Revision as of 19:08, 5 June 2009
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	}}		}}

	222 MHz to 225 MHz is an amateur band only in Region 2. Countries where 222 MHz operation exists include the United States, Mexico, Central American nations, Caribbean nations, and Brazil.		222 MHz to 225 MHz is an amateur band only in Region 2. Countries where 222 MHz operation exists include the United States, Mexico, Central American nations, Caribbean nations, and Brazil. In the United States, 222 MHz is one of very few bands in which holders of the Novice license had been permitted to transmit voice.

			Availability of 222 MHz repeaters varies widely from one US region to another, as the bulk of FM activity is on [[2 metres]] and [[70 centimetres]] with other bands most often used in congested areas where all suitable 2-metre repeater frequency pairs have already been allocated. In California, 222MHz has been used as a means to link multiple repeaters in and around the state.

			A 220-222 MHz band segment has been reallocated to commercial narrowband land-mobile users in the US, but may be available in portions of Canada. A secondary allocation on 219-220 MHz exists in the US (fixed digital stations only, with stringent restrictions to prevent interference to automated marine services) but is rarely used.

			Equipment selection tends to be more limited than on the [[2 metre]] band: a cause for concern in the US radio amateur community as fewer choices for transceivers leads to fewer users on the band, increasing the risk that more of this valuable but underutilised VHF spectrum will be lost to reallocation to commercial land-mobile use.

	== Equipment ==		== Equipment ==

	Because 222 MHz is only available to amateurs in Region 2, very little currently-manufactured equipment supports it. Examples include the [http://www.eham.net/reviews/detail/1404 Alinco DR-235T], the [http://www.eham.net/reviews/detail/1739 Kenwood TH-F6A] and the U.S. versions of the [[Yaesu]] [http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=111&encProdID=8D3254BFC69FB172D78647DC56EFB0E9&DivisionID=65&isArchived=0 VX-7R] and [http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=111&encProdID=4C6F204F6FEBB5BAFA58BCC1C131EAC0&DivisionID=65&isArchived=0 VX-6R] [[~~HTs~~\|HT]]. Many amateurs, especially those who do weak-signal work, use [[transverters]] on this band.		Because 222 MHz is only available to amateurs in Region 2, very little currently-manufactured equipment supports it. Examples include the [http://www.eham.net/reviews/detail/1404 Alinco DR-235T], the [http://www.eham.net/reviews/detail/1739 Kenwood TH-F6A] and the U.S. versions of the [[Yaesu]] [http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=111&encProdID=8D3254BFC69FB172D78647DC56EFB0E9&DivisionID=65&isArchived=0 VX-7R] and [http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=111&encProdID=4C6F204F6FEBB5BAFA58BCC1C131EAC0&DivisionID=65&isArchived=0 VX-6R] [[handheld transceiver\|HT]]. While the Alinco 235 is a reasonably-powerful single-band mobile transceiver, most of the current generation of 222MHz-capable transceivers are small handheld devices which operate at greatly-reduced power on this band. New multiband mobile or base equipment for 222MHz is not readily available commercially at this time.

			Conversion of commercial land-mobile radio equipment for radio amateur use is more difficult on 222MHz as much of this equipment is designed for operation below 174 MHz, on bands near or adjacent to the [[2 metre]] band. Adaptation of surplus commercial base station equipment (such as the Motorola Micor or GE Mastr II series) to repeater operation is possible but requires extensive RF modification as there is little or no commercial activity in this portion of the spectrum. [http://www.hamtronics.com/r100.htm Hamtronics] does manufacture new single-channel receiver and transmitter boards which are suitable for the construction of radioamateur repeater systems on 222MHz.

			Many amateurs, especially those who do weak-signal work, use [[transverters]] on this band.

	== Modulation ==		== Modulation ==
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	222 MHz propagation is primarily line of sight, although enhanced modes do exist. There is no [[Propagation#Propagation_Theory_.28unfinished.29\|F2 layer]] propagation on this band, but [[tropospheric ducting]] and [[aurora]] exist.		222 MHz propagation is primarily line of sight, although enhanced modes do exist. There is no [[Propagation#Propagation_Theory_.28unfinished.29\|F2 layer]] propagation on this band, but [[tropospheric ducting]] and [[aurora]] exist.

			== External link ==
			* [http://www.slvrc.org/220band.htm Getting on the 220 band], St. Lawrence Valley Repeater Council (SLVRC)

	{{bands}}		{{bands}}

Carlb: /* Propagation */

2009-04-09T03:25:22Z

Propagation

← Older revision		Revision as of 20:25, 8 April 2009
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	222 MHz propagation is primarily line of sight, although enhanced modes do exist. There is no [[Propagation#Propagation_Theory_.28unfinished.29\|F2 layer]] propagation on this band, but [[tropospheric ducting]] and [[aurora]] exist.		222 MHz propagation is primarily line of sight, although enhanced modes do exist. There is no [[Propagation#Propagation_Theory_.28unfinished.29\|F2 layer]] propagation on this band, but [[tropospheric ducting]] and [[aurora]] exist.


			{{bands}}

G7VRD at 16:38, 12 July 2008

2008-07-12T16:38:54Z

← Older revision		Revision as of 09:38, 12 July 2008
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	\|USA=222.000-225.000		\|USA=222.000-225.000
	\|UST=222.000-225.000		\|UST=222.000-225.000
			\|UK=Not used
	}}		}}

TimVK4YEH: redirect f2 layer to propagation theory

2008-07-04T21:44:42Z

redirect f2 layer to propagation theory

← Older revision		Revision as of 14:44, 4 July 2008
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	== Propagation ==		== Propagation ==

	222 MHz propagation is primarily line of sight, although enhanced modes do exist. There is no [[F2 layer~~\|F2~~]] propagation on this band, but [[tropospheric ducting]] and [[aurora]] exist.		222 MHz propagation is primarily line of sight, although enhanced modes do exist. There is no [[Propagation#Propagation_Theory_.28unfinished.29\|F2 layer]] propagation on this band, but [[tropospheric ducting]] and [[aurora]] exist.

TimVK4YEH: added links

2008-07-02T05:03:44Z

added links

← Older revision		Revision as of 22:03, 1 July 2008
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			Other VHF/UHF/Microwave wiki pages : [[13 centimetres]], [[9 centimetres]], [[6 centimetres]], [[3 centimetres]] [[1.25 centimetres]] and [[Bands above 24GHz]].

	{{Band		{{Band
	\|band=1.25m		\|band=1.25m

TimVK4YEH: changed spelling on tropo ducting link to match page

2008-07-01T19:55:22Z

changed spelling on tropo ducting link to match page

← Older revision		Revision as of 12:55, 1 July 2008
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	== Propagation ==		== Propagation ==

	222 MHz propagation is primarily line of sight, although enhanced modes do exist. There is no [[F2 layer\|F2]] propagation on this band, but [[~~troposphere~~ ducting]] and [[aurora]] exist.		222 MHz propagation is primarily line of sight, although enhanced modes do exist. There is no [[F2 layer\|F2]] propagation on this band, but [[tropospheric ducting]] and [[aurora]] exist.

YL: Changed "Central America" and "Caribbean" to "Central American nations" and "Caribbeans nations", since the sentence refers to countries.

2008-04-04T22:09:36Z

Changed "Central America" and "Caribbean" to "Central American nations" and "Caribbeans nations", since the sentence refers to countries.

← Older revision		Revision as of 15:09, 4 April 2008
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	}}		}}

	222 MHz to 225 MHz is an amateur band only in Region 2. Countries where 222 MHz operation exists include the United States, Mexico, Central ~~America~~, ~~the~~ Caribbean, and Brazil.		222 MHz to 225 MHz is an amateur band only in Region 2. Countries where 222 MHz operation exists include the United States, Mexico, Central American nations, Caribbean nations, and Brazil.

	== Equipment ==		== Equipment ==

YL: Changed "United States" to "Region 2", and included list of countries where 222 ops are occurring.

2008-04-04T22:08:30Z

Changed "United States" to "Region 2", and included list of countries where 222 ops are occurring.

← Older revision		Revision as of 15:08, 4 April 2008
Line 7:		Line 7:
	}}		}}

	222 MHz to 225 MHz is an amateur band only in the United States.		222 MHz to 225 MHz is an amateur band only in Region 2. Countries where 222 MHz operation exists include the United States, Mexico, Central America, the Caribbean, and Brazil.

	== Equipment ==		== Equipment ==

	Because 222 MHz is only available to amateurs in ~~the United States~~, very little currently-manufactured equipment supports it. Examples include the [http://www.eham.net/reviews/detail/1404 Alinco DR-235T], the [http://www.eham.net/reviews/detail/1739 Kenwood TH-F6A] and the U.S. versions of the [[Yaesu]] [http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=111&encProdID=8D3254BFC69FB172D78647DC56EFB0E9&DivisionID=65&isArchived=0 VX-7R] and [http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=111&encProdID=4C6F204F6FEBB5BAFA58BCC1C131EAC0&DivisionID=65&isArchived=0 VX-6R] [[HTs\|HT]]. Many amateurs, especially those who do weak-signal work, use [[transverters]] on this band.		Because 222 MHz is only available to amateurs in Region 2, very little currently-manufactured equipment supports it. Examples include the [http://www.eham.net/reviews/detail/1404 Alinco DR-235T], the [http://www.eham.net/reviews/detail/1739 Kenwood TH-F6A] and the U.S. versions of the [[Yaesu]] [http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=111&encProdID=8D3254BFC69FB172D78647DC56EFB0E9&DivisionID=65&isArchived=0 VX-7R] and [http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=111&encProdID=4C6F204F6FEBB5BAFA58BCC1C131EAC0&DivisionID=65&isArchived=0 VX-6R] [[HTs\|HT]]. Many amateurs, especially those who do weak-signal work, use [[transverters]] on this band.

	== Modulation ==		== Modulation ==

YL: Added band template chart.

2008-03-29T01:14:46Z

Added band template chart.

← Older revision		Revision as of 18:14, 28 March 2008
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			{{Band
			\|band=1.25m
			\|USG=222.000-225.000
			\|USE=222.000-225.000
			\|USA=222.000-225.000
			\|UST=222.000-225.000
			}}

	222 MHz to 225 MHz is an amateur band only in the United States.		222 MHz to 225 MHz is an amateur band only in the United States.

	== Equipment ==		== Equipment ==

	Because 222 MHz is only available to amateurs in the United States, very little currently-manufactured equipment supports it~~; examples~~ include the [http://www.eham.net/reviews/detail/1404 Alinco DR-235T], the [http://www.eham.net/reviews/detail/1739 Kenwood TH-F6A] and the U.S. versions of the [[Yaesu]] [http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=111&encProdID=8D3254BFC69FB172D78647DC56EFB0E9&DivisionID=65&isArchived=0 VX-7R] and [http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=111&encProdID=4C6F204F6FEBB5BAFA58BCC1C131EAC0&DivisionID=65&isArchived=0 VX-6R] HTs. Many amateurs, especially those who do weak-signal work, use [[transverters]] on this band.		Because 222 MHz is only available to amateurs in the United States, very little currently-manufactured equipment supports it. Examples include the [http://www.eham.net/reviews/detail/1404 Alinco DR-235T], the [http://www.eham.net/reviews/detail/1739 Kenwood TH-F6A] and the U.S. versions of the [[Yaesu]] [http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=111&encProdID=8D3254BFC69FB172D78647DC56EFB0E9&DivisionID=65&isArchived=0 VX-7R] and [http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=111&encProdID=4C6F204F6FEBB5BAFA58BCC1C131EAC0&DivisionID=65&isArchived=0 VX-6R] [[HTs\|HT]]. Many amateurs, especially those who do weak-signal work, use [[transverters]] on this band.

	== Modulation ==		== Modulation ==
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	== Propagation ==		== Propagation ==

	~~Primarily~~ line of sight, although enhanced modes do exist. There is no [[F2]] propagation on this band, but [[troposphere ducting]] and [[aurora]] exist.		222 MHz propagation is primarily line of sight, although enhanced modes do exist. There is no [[F2 layer\|F2]] propagation on this band, but [[troposphere ducting]] and [[aurora]] exist.