70 centimetres - Revision history

K1ATV: /* Equipment */ Cable TV channels 57 to 61

2010-06-03T17:28:53Z

Equipment: Cable TV channels 57 to 61

← Older revision		Revision as of 10:28, 3 June 2010
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	Single-band equipment for 70cm is rare, but many dual-band transceivers are available that operate on both [[2 metres]] and 70cm. Available gear includes base stations, mobile units and [[HT\|HTs]].		Single-band equipment for 70cm is rare, but many dual-band transceivers are available that operate on both [[2 metres]] and 70cm. Available gear includes base stations, mobile units and [[HT\|HTs]].

	One single-band mobile FM transceiver for this band is Alinco's 435. In some cases, cable-ready broadcast television receivers and antennas have been used to receive fast-scan ATV in this band, as this over-the-air frequency range overlaps that of existing cable converter channels.		One single-band mobile FM transceiver for this band is Alinco's 435. In some cases, cable-ready broadcast television receivers and antennas have been used to receive fast-scan ATV in this band, as this over-the-air frequency range overlaps that of existing cable converter channels 57 to 61.

	== Modulation ==		== Modulation ==

Carlb: /* Equipment */

2009-06-06T02:26:46Z

Equipment

← Older revision		Revision as of 19:26, 5 June 2009
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	== Equipment ==		== Equipment ==

	Single-band equipment for 70cm is rare, but many dual-band transceivers are available that operate on both [[2 metres]] and 70cm. Available gear includes ~~both~~ mobile units and [[HT\|HTs]].		Single-band equipment for 70cm is rare, but many dual-band transceivers are available that operate on both [[2 metres]] and 70cm. Available gear includes base stations, mobile units and [[HT\|HTs]].

			One single-band mobile FM transceiver for this band is Alinco's 435. In some cases, cable-ready broadcast television receivers and antennas have been used to receive fast-scan ATV in this band, as this over-the-air frequency range overlaps that of existing cable converter channels.

	== Modulation ==		== Modulation ==

Carlb: /* Modulation */

2009-06-06T02:19:09Z

Modulation

← Older revision		Revision as of 19:19, 5 June 2009
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	== Modulation ==		== Modulation ==

	The most common mode is [[Modes#Frequency Modulation (FM)\|FM]], but [[weak-signal]] operation using [[Modes#Continuous Wave (CW)\|CW]] and [[Modes#Single Sideband Modulation (SSB)\|SSB]] occurs at the lower end of the band. This is also the most popular band for [[Fast-Scan Television (ATV)\|Fast-Scan Television]].		The most common mode is [[Modes#Frequency Modulation (FM)\|FM]], but [[weak-signal]] operation using [[Modes#Continuous Wave (CW)\|CW]] and [[Modes#Single Sideband Modulation (SSB)\|SSB]] occurs at the lower end of the band. The band is reasonably popular for FM voice repeaters in many regions, second only to the [[2 metre]] band, due to the ready availability of two-band mobile and handheld transceivers. This is also the most popular band for [[Fast-Scan Television (ATV)\|Fast-Scan Television]] as it is the lowest-frequency amateur band with sufficient space available to accommodate an entire 6-8MHz wide fast-scan TV signal.

	== Propagation ==		== Propagation ==

Carlb: /* Australian 70cm bandplan */

2009-04-09T03:26:00Z

Australian 70cm bandplan

← Older revision		Revision as of 20:26, 8 April 2009
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	[[Image:VK4YEH_Vk_70cm_bandplan.jpg]]		[[Image:VK4YEH_Vk_70cm_bandplan.jpg]]


			{{bands}}

G7VRD at 16:55, 12 July 2008

2008-07-12T16:55:35Z

← Older revision		Revision as of 09:55, 12 July 2008
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	{{Band		{{Band
	\|band=70cm		\|band=70cm
	\|USG=420~~.000~~-450~~.000~~		\|USG=420-450
	\|USE=420~~.000~~-450~~.000~~		\|USE=420-450
	\|USA=420~~.000~~-450~~.000~~		\|USA=420-450
	\|UST=420~~.000~~-450~~.000~~		\|UST=420-450
			\|UK=430-440
	}}		}}

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	== Propagation ==		== Propagation ==

	Propagation at UHF is primarily line-of-sight. However, [[tropospheric ducting]] can occasionally ~~upport~~ contacts over ranges of as much as 1500 to 3000 kilometres. [[Aurora]] and [[meteor scatter]] propagation have been observed, but are relatively rare and difficult to use.		Propagation at UHF is primarily line-of-sight. However, [[tropospheric ducting]] can occasionally support contacts over ranges of as much as 1500 to 3000 kilometres. [[Aurora]] and [[meteor scatter]] propagation have been observed, but are relatively rare and difficult to use.

	==Australian 70cm bandplan==		==Australian 70cm bandplan==

TimVK4YEH: added links

2008-07-02T05:02:41Z

added links

← Older revision		Revision as of 22:02, 1 July 2008
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			Other VHF/UHF/Microwave wiki pages : [[33 centimetres]], [[13 centimetres]], [[9 centimetres]], [[6 centimetres]],[[3 centimetres]] [[1.25 centimetres]] and [[Bands above 24GHz]].

	{{Band		{{Band
	\|band=70cm		\|band=70cm

TimVK4YEH at 18:04, 1 July 2008

2008-07-01T18:04:54Z

← Older revision		Revision as of 11:04, 1 July 2008
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	Propagation at UHF is primarily line-of-sight. However, [[tropospheric ducting]] can occasionally upport contacts over ranges of as much as 1500 to 3000 kilometres. [[Aurora]] and [[meteor scatter]] propagation have been observed, but are relatively rare and difficult to use.		Propagation at UHF is primarily line-of-sight. However, [[tropospheric ducting]] can occasionally upport contacts over ranges of as much as 1500 to 3000 kilometres. [[Aurora]] and [[meteor scatter]] propagation have been observed, but are relatively rare and difficult to use.

	==Australian 70cm ~~bandplans~~ ==		==Australian 70cm bandplan==

	Access : All licence classes		Access : All licence classes

TimVK4YEH: added vk 70cm info

2008-07-01T18:04:18Z

added vk 70cm info

← Older revision		Revision as of 11:04, 1 July 2008
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	==Australian 70cm bandplans ==		==Australian 70cm bandplans ==

			Access : All licence classes

			420 - 450 MHz RADIOLOCATION Primary Service

			420 - 450 MHz FIXED, MOBILE Primary Service

			420 - 430 MHz AMATEUR (restricted access in some states) Secondary Service

			430 - 450 MHz AMATEUR Secondary Service

			435 - 438 MHz AMATEUR SATELLITE Permitted on non-interference basis


			[[Image:VK4YEH_Vk_70cm_bandplan.jpg]]

TimVK4YEH at 09:38, 1 July 2008

2008-07-01T09:38:10Z

← Older revision		Revision as of 02:38, 1 July 2008
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	Propagation at UHF is primarily line-of-sight. However, [[tropospheric ducting]] can occasionally upport contacts over ranges of as much as 1500 to 3000 kilometres. [[Aurora]] and [[meteor scatter]] propagation have been observed, but are relatively rare and difficult to use.		Propagation at UHF is primarily line-of-sight. However, [[tropospheric ducting]] can occasionally upport contacts over ranges of as much as 1500 to 3000 kilometres. [[Aurora]] and [[meteor scatter]] propagation have been observed, but are relatively rare and difficult to use.

			==Australian 70cm bandplans ==

YL: Wrote 70cm summary section. More details on rigs would be useful.

2008-03-29T01:31:44Z

Wrote 70cm summary section. More details on rigs would be useful.

New page

{{Band
|band=70cm
|USG=420.000-450.000
|USE=420.000-450.000
|USA=420.000-450.000
|UST=420.000-450.000
}}

The 70 centimetre band is a popular [[UHF]] band.

== Equipment ==

Single-band equipment for 70cm is rare, but many dual-band transceivers are available that operate on both [[2 metres]] and 70cm. Available gear includes both mobile units and [[HT|HTs]].

== Modulation ==

The most common mode is [[Modes#Frequency Modulation (FM)|FM]], but [[weak-signal]] operation using [[Modes#Continuous Wave (CW)|CW]] and [[Modes#Single Sideband Modulation (SSB)|SSB]] occurs at the lower end of the band. This is also the most popular band for [[Fast-Scan Television (ATV)|Fast-Scan Television]].

== Propagation ==

Propagation at UHF is primarily line-of-sight. However, [[tropospheric ducting]] can occasionally upport contacts over ranges of as much as 1500 to 3000 kilometres. [[Aurora]] and [[meteor scatter]] propagation have been observed, but are relatively rare and difficult to use.