VHF airband - Revision history

R4002 at 16:30, 14 November 2024

2024-11-14T16:30:03Z

← Older revision		Revision as of 16:30, 14 November 2024
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	117.975 MHz - 136.975 MHz - aeronautical voice and data communication, [[AM\|AM]] (25 kHz / 8.33 kHz channel spacing)		117.975 MHz - 136.975 MHz - aeronautical voice and data communication, [[AM\|AM]] (25 kHz / 8.33 kHz channel spacing)

-	Emergency frequency 121.5 MHz is often known as GUARD CHANNEL - analogous to [[VHF_marine\|VHF marine]] channel [[VHF_marine#VHF_Marine_Channels_International_and_USA_Simplex\|16]] (156.800 MHz), [[HF_marine\|2182 kHz]], 4125 kHz, 6215 kHz, etc.	+	Emergency frequency 121.5 MHz is often known as ''GUARD CHANNEL'', simply called "Guard" by most users - analogous to [[VHF_marine\|VHF marine]] channel [[VHF_marine#VHF_Marine_Channels_International_and_USA_Simplex\|16]] (156.800 MHz), [[HF_marine\|2182 kHz]], 4125 kHz, 6215 kHz, etc.

	''Aeronautical radiocommunication service, R (Route) service. Note that OR (military) allocation extends above 137 MHz to 150.8 MHz or 150 MHz or 144 MHz, depending on the country).''		''Aeronautical radiocommunication service, R (Route) service. Note that OR (military) allocation extends above 137 MHz to 150.8 MHz or 150 MHz or 144 MHz, depending on the country).''

R4002 at 16:29, 14 November 2024

2024-11-14T16:29:41Z

← Older revision		Revision as of 16:29, 14 November 2024
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-	[[VHF / UHF Radio\|VHF]]-AM aircraft band, worldwide allocation 108-137 MHz, divided into two subbands.	+	[[VHF / UHF Radio\|VHF]]-AM aircraft band, worldwide allocation 108-137 MHz, divided into two subbands. Aeronautical radio service. See also: MF/HF SSB aircraft bands [[HF_airband\|aeronautical service]] R (route) and OR (off-route).

	108.0 MHz - 117.95 MHz - aeronautical navigation only - [[VOR]], VORTAC, [[ILS\|localizers/glideslope (ILS)]] (50 kHz channel spacing)		108.0 MHz - 117.95 MHz - aeronautical navigation only - [[VOR]], VORTAC, [[ILS\|localizers/glideslope (ILS)]] (50 kHz channel spacing)

R4002: /* Common VHF Aircraft Frequencies */

2024-11-14T16:28:03Z

Common VHF Aircraft Frequencies

← Older revision		Revision as of 16:28, 14 November 2024
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	*121.500 MHz - Emergency - Guard 121.5 MHz		*121.500 MHz - Emergency - Guard 121.5 MHz
-	*123.100 MHz - SAR On Scene Common Use 123.1 MHz, including [[Civil_Air_Patrol#Civil_Air_Patrol_CAP_VHF_Frequencies\|Civil Air Patrol]]	+	*123.100 MHz - SAR On Scene [[Nationwide_Public_Safety_Interoperability#Federal_.2F_Non-Federal_Interagency_Search_and_Rescue_SAR_Interoperability\|Common Use]] 123.1 MHz, including [[Civil_Air_Patrol#Civil_Air_Patrol_CAP_VHF_Frequencies\|Civil Air Patrol]]
	*122.925 MHz - Special Use, Government Resource Management Multicom 122.925 MHz 122.92 MHz		*122.925 MHz - Special Use, Government Resource Management Multicom 122.925 MHz 122.92 MHz
	*122.900 MHz - Multicom, SAR training and secondary 122.9 MHz		*122.900 MHz - Multicom, SAR training and secondary 122.9 MHz
		+	*122.875 MHz - Multicom - used for air to air communications, including public safety, government users in some areas
	*122.750 MHz - Air To Air official fixed wing air-to-air frequency 122.75 MHz		*122.750 MHz - Air To Air official fixed wing air-to-air frequency 122.75 MHz
	*123.025 MHz - Air To Air 123.025 MHz 123.02 MHz		*123.025 MHz - Air To Air 123.025 MHz 123.02 MHz

R4002 at 11:29, 16 August 2024

2024-08-16T11:29:46Z

← Older revision		Revision as of 11:29, 16 August 2024
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	8.33 kHz channel spacing is used in Europe and in select other locations, most of the world uses 25 kHz spacing for a total of 760 channels. VDL (VHF data link) systems such as ACARS (aircraft communications addressing and reporting system) use select frequencies in the VHF airband, including 131.550 MHz and 136.975 MHz (in the United States).		8.33 kHz channel spacing is used in Europe and in select other locations, most of the world uses 25 kHz spacing for a total of 760 channels. VDL (VHF data link) systems such as ACARS (aircraft communications addressing and reporting system) use select frequencies in the VHF airband, including 131.550 MHz and 136.975 MHz (in the United States).

-	VHF aircraft communications originated during the Second World War. German air-to-ground communications networks, various radar systems (eg. Chain Home) operated in what is now called the VHF low band (roughly 35-48 MHz). American air to air and air-to-ground systems started transitioning from MF/HF to VHF-AM (100 to 156 MHz, usually crystal controlled radios with pushbutton channel selection) during the war. The 100 to 156 MHz band was only used during the war, with the narrower 108-135 MHz band being adopted shortly thereafter. Originally 100 kHz steps, followed by 50 kHz steps, then the expansion of the band up to 136.000 MHz, then eventually 136.975 MHz and 136.99167 MHz (136.995 MHz) or 137 MHz. Military aircraft have maintained capability to operate above 137 MHz for air to air tactical communications. Coverage extends up to [[Business_Radio#VHF_High_Band_150-174_MHz\|150.8 MHz]] (officially).
-
-	Military aircraft retain the capability to transmit and receive on the VHF-AM aircraft band, with US military aircraft radios covering up to 150.8 MHz in AM mode (25 kHz steps). Military aircraft also make extensive use of the UHF-AM aircraft band 225-400 MHz, often with ECCM systems such as HAVE QUICK, HAVE QUICK II and SATURN frequency hopping modes. The 225-400 MHz band is also extensively used for SATCOM and other purposes outside the scope of air-to-air communications. 380-400 MHz is shared with land mobile radio systems used by the US military in the United States. Military aircraft in close air support, MEDEVAC and other roles will also be equipped with VHF-FM [[SINCGARS]] tactical military radios for air-to-ground and air-to-air communications in both frequency hopping (FH) and single-channel (SC) modes.

	===Common VHF Aircraft Frequencies===		===Common VHF Aircraft Frequencies===
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	Some frequencies will not be switched over to 8.33 channeling. The obvious one is 121.5 MHz - the aircraft emergency frequency.		Some frequencies will not be switched over to 8.33 channeling. The obvious one is 121.5 MHz - the aircraft emergency frequency.
		+
		+
		+	VHF aircraft communications originated during the Second World War. German air-to-ground communications networks, various radar systems (eg. Chain Home) operated in what is now called the VHF low band (roughly 35-48 MHz). American air to air and air-to-ground systems started transitioning from MF/HF to VHF-AM (100 to 156 MHz, usually crystal controlled radios with pushbutton channel selection) during the war. The 100 to 156 MHz band was only used during the war, with the narrower 108-135 MHz band being adopted shortly thereafter. Originally 100 kHz steps, followed by 50 kHz steps, then the expansion of the band up to 136.000 MHz, then eventually 136.975 MHz and 136.99167 MHz (136.995 MHz) or 137 MHz. Military aircraft have maintained capability to operate above 137 MHz for air to air tactical communications. Coverage extends up to [[Business_Radio#VHF_High_Band_150-174_MHz\|150.8 MHz]] (officially).
		+
		+	Military aircraft retain the capability to transmit and receive on the VHF-AM aircraft band, with US military aircraft radios covering up to 150.8 MHz in AM mode (25 kHz steps). Military aircraft also make extensive use of the UHF-AM aircraft band 225-400 MHz, often with ECCM systems such as HAVE QUICK, HAVE QUICK II and SATURN frequency hopping modes. The 225-400 MHz band is also extensively used for SATCOM and other purposes outside the scope of air-to-air communications. 380-400 MHz is shared with land mobile radio systems used by the US military in the United States. Military aircraft in close air support, MEDEVAC and other roles will also be equipped with VHF-FM [[SINCGARS]] tactical military radios for air-to-ground and air-to-air communications in both frequency hopping (FH) and single-channel (SC) modes.

	===NAV Navigation VHF VOR===		===NAV Navigation VHF VOR===

R4002 at 11:28, 16 August 2024

2024-08-16T11:28:16Z

← Older revision		Revision as of 11:28, 16 August 2024
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-	[[VHF / UHF Radio\|VHF]]-AM aircraft band, worldwide allocation 108-137 MHz, divided into two subbands:	+	[[VHF / UHF Radio\|VHF]]-AM aircraft band, worldwide allocation 108-137 MHz, divided into two subbands.

	108.0 MHz - 117.95 MHz - aeronautical navigation only - [[VOR]], VORTAC, [[ILS\|localizers/glideslope (ILS)]] (50 kHz channel spacing)		108.0 MHz - 117.95 MHz - aeronautical navigation only - [[VOR]], VORTAC, [[ILS\|localizers/glideslope (ILS)]] (50 kHz channel spacing)
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	Emergency frequency 121.5 MHz is often known as GUARD CHANNEL - analogous to [[VHF_marine\|VHF marine]] channel [[VHF_marine#VHF_Marine_Channels_International_and_USA_Simplex\|16]] (156.800 MHz), [[HF_marine\|2182 kHz]], 4125 kHz, 6215 kHz, etc.		Emergency frequency 121.5 MHz is often known as GUARD CHANNEL - analogous to [[VHF_marine\|VHF marine]] channel [[VHF_marine#VHF_Marine_Channels_International_and_USA_Simplex\|16]] (156.800 MHz), [[HF_marine\|2182 kHz]], 4125 kHz, 6215 kHz, etc.
		+
		+	''Aeronautical radiocommunication service, R (Route) service. Note that OR (military) allocation extends above 137 MHz to 150.8 MHz or 150 MHz or 144 MHz, depending on the country).''

	8.33 kHz channel spacing is used in Europe and in select other locations, most of the world uses 25 kHz spacing for a total of 760 channels. VDL (VHF data link) systems such as ACARS (aircraft communications addressing and reporting system) use select frequencies in the VHF airband, including 131.550 MHz and 136.975 MHz (in the United States).		8.33 kHz channel spacing is used in Europe and in select other locations, most of the world uses 25 kHz spacing for a total of 760 channels. VDL (VHF data link) systems such as ACARS (aircraft communications addressing and reporting system) use select frequencies in the VHF airband, including 131.550 MHz and 136.975 MHz (in the United States).
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	===VHF ACARS Data Frequencies===		===VHF ACARS Data Frequencies===

-	''Note: these frequencies are not used for ACARS data in all areas, and the ~~frequency~~ list is likely ~~not complete~~. ''	+	''Note: these frequencies are not used for ACARS data in all areas, and the list below is likely incomplete. ''

	*129.350 MHz - Wide Area Coverage (En Route)		*129.350 MHz - Wide Area Coverage (En Route)

R4002 at 10:34, 18 June 2024

2024-06-18T10:34:11Z

← Older revision		Revision as of 10:34, 18 June 2024
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	*123.025 MHz - Air To Air 123.025 MHz 123.02 MHz		*123.025 MHz - Air To Air 123.025 MHz 123.02 MHz
	*123.400 MHz - Air To Air "Fingers" 123.4 MHz		*123.400 MHz - Air To Air "Fingers" 123.4 MHz
-	*123.450 MHz - Air To Air "Fingers" or interplane -	+	*123.450 MHz - Air To Air "Fingers" or interplane - official and unofficial
	*123.450 MHz - Officially used for air to air over oceans 123.45 PAC Air-To-Air International Air To Air		*123.450 MHz - Officially used for air to air over oceans 123.45 PAC Air-To-Air International Air To Air
	*122.950 MHz - Unicom - Controlled Airports - Traffic Advisory For Towered Airports		*122.950 MHz - Unicom - Controlled Airports - Traffic Advisory For Towered Airports

R4002: /* Common VHF Aircraft Frequencies */

2024-05-29T14:49:49Z

Common VHF Aircraft Frequencies

← Older revision		Revision as of 14:49, 29 May 2024
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	*123.025 MHz - Air To Air 123.025 MHz 123.02 MHz		*123.025 MHz - Air To Air 123.025 MHz 123.02 MHz
	*123.400 MHz - Air To Air "Fingers" 123.4 MHz		*123.400 MHz - Air To Air "Fingers" 123.4 MHz
-	*123.450 MHz - Air To Air "Fingers" or interplane - ~~officially~~ used for air to air over oceans 123.45 PAC Air-To-Air International Air To Air	+	*123.450 MHz - Air To Air "Fingers" or interplane -
		+	*123.450 MHz - Officially used for air to air over oceans 123.45 PAC Air-To-Air International Air To Air
	*122.950 MHz - Unicom - Controlled Airports - Traffic Advisory For Towered Airports		*122.950 MHz - Unicom - Controlled Airports - Traffic Advisory For Towered Airports
	*122.850 MHz - Multicom 122.85 MHz		*122.850 MHz - Multicom 122.85 MHz

R4002: /* Common VHF Aircraft Frequencies */

2024-05-29T14:49:24Z

Common VHF Aircraft Frequencies

R4002: /* 8.33 kHz channels vs. 25 kHz channels */

2024-05-29T14:48:22Z

8.33 kHz channels vs. 25 kHz channels

← Older revision		Revision as of 14:48, 29 May 2024
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	In areas using the narrower 8.33 kHz spacing, things become a little more complicated. Due to the number of digits after the decimal point on the 8.33 kHz channels, a rounding system has been developed. Instead of reading the entire frequency, aircraft radio displays round the channel up or down to the nearest 5 kHz channel (so 120.00833 MHz becomes 120.010 MHz, etc.)		In areas using the narrower 8.33 kHz spacing, things become a little more complicated. Due to the number of digits after the decimal point on the 8.33 kHz channels, a rounding system has been developed. Instead of reading the entire frequency, aircraft radio displays round the channel up or down to the nearest 5 kHz channel (so 120.00833 MHz becomes 120.010 MHz, etc.)

-	This gets even more insane when you include the old 25 kHz channels in the 8.33 kHz channel plan. Therefore, you must know if your radio is in 25 kHz mode or 8.33 kHz mode. For example, on a 25 kHz radio, 118.025 MHz shows on the display as 118.025 MHz (or 118.02 MHz). On a radio switched to 8.33 kHz mode, 118.025 MHz shows on the display as 118.030 MHz.~~.. The lunacy is pretty apparent here. Instead of switching from 25 kHz steps to 8.33 kHz steps, the switch should have been from 25 kHz steps to 12.5 kHz steps or 5 kHz steps.~~	+	This gets even more insane when you include the old 25 kHz channels in the 8.33 kHz channel plan. Therefore, you must know if your radio is in 25 kHz mode or 8.33 kHz mode. For example, on a 25 kHz radio, 118.025 MHz shows on the display as 118.025 MHz (or 118.02 MHz). On a radio switched to 8.33 kHz mode, 118.025 MHz shows on the display as 118.030 MHz.

	*118.0000 MHz - 118.000 MHz [display frequency]		*118.0000 MHz - 118.000 MHz [display frequency]
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	[[File:Icom_IC-A210E.jpg\|200px\|thumb\|left\|Icom IC-A210E VHF-AM airband transceiver, designed for installation in aircraft, this version of the IC-A210 supports the 8.33 kHz narrowband channel spacing required in Europe. Frequency coverage is 118.000 MHz to 136.975 MHz in 25 kHz or 8.33 kHz steps with 6 watts AM carrier power.]]		[[File:Icom_IC-A210E.jpg\|200px\|thumb\|left\|Icom IC-A210E VHF-AM airband transceiver, designed for installation in aircraft, this version of the IC-A210 supports the 8.33 kHz narrowband channel spacing required in Europe. Frequency coverage is 118.000 MHz to 136.975 MHz in 25 kHz or 8.33 kHz steps with 6 watts AM carrier power.]]

-	Some frequencies will not be switched over to 8.33 channeling. The obvious one is 121.5 MHz - the aircraft emergency frequency.	+	Some frequencies will not be switched over to 8.33 channeling. The obvious one is 121.5 MHz - the aircraft emergency frequency.
-		+

	===NAV Navigation VHF VOR===		===NAV Navigation VHF VOR===

R4002: /* VHF ACARS Data Frequencies */

2024-05-29T14:47:59Z

VHF ACARS Data Frequencies

← Older revision		Revision as of 14:47, 29 May 2024
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	===VHF ACARS Data Frequencies===		===VHF ACARS Data Frequencies===
		+
		+	''Note: these frequencies are not used for ACARS data in all areas, and the frequency list is likely not complete. ''

	*129.350 MHz - Wide Area Coverage (En Route)		*129.350 MHz - Wide Area Coverage (En Route)
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	*131.650 MHz - Terminal Base Station Links At Airports		*131.650 MHz - Terminal Base Station Links At Airports
	*131.725 MHz - Terminal Base Station Links At Airports		*131.725 MHz - Terminal Base Station Links At Airports
-
-

	===Selected VHF aircraft sub-bands===		===Selected VHF aircraft sub-bands===

← Older revision		Revision as of 14:49, 29 May 2024
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	*126.200 MHz - MILCOM - Military airports, advisory frequency 126.2 MHz		*126.200 MHz - MILCOM - Military airports, advisory frequency 126.2 MHz
	*134.100 MHz - MILCOM - Military airports, advisory frequency 134.1 MHz		*134.100 MHz - MILCOM - Military airports, advisory frequency 134.1 MHz
-	*123.975 MHz - VHF AM "Victor" National Firefighting Use	+	*123.975 MHz - VHF AM "Victor" National Firefighting Use 123.97 MHz
	*132.450 MHz - VHF AM "Victor" Flight Following - VHF [[Nationwide_Public_Safety_Interoperability#National_Incident_Radio_Support_Cache\|National Flight Following]]		*132.450 MHz - VHF AM "Victor" Flight Following - VHF [[Nationwide_Public_Safety_Interoperability#National_Incident_Radio_Support_Cache\|National Flight Following]]
-	*122.700 MHz - Unicom - Uncontrolled Airports	+	*122.700 MHz - Unicom - Uncontrolled Airports 122.7 MHz
-	*122.725 MHz - Unicom - Uncontrolled Airports	+	*122.725 MHz - Unicom - Uncontrolled Airports 122.72 MHz
-	*122.775 MHz - Unicom - Uncontrolled Airports	+	*122.775 MHz - Unicom - Uncontrolled Airports 122.77 MHz
-	*122.800 MHz - Unicom - Uncontrolled Airports	+	*122.800 MHz - Unicom - Uncontrolled Airports 122.8 MHz
-	*122.975 MHz - Unicom - Uncontrolled Airports	+	*122.975 MHz - Unicom - Uncontrolled Airports 122.97 MHz
-	*123.000 MHz - Unicom - Uncontrolled Airports	+	*123.000 MHz - Unicom - Uncontrolled Airports 123.0 MHz
	*123.025 MHz - Unicom - Uncontrolled Airports - air to air traffic advisory frequency in some areas 123.02 MHz		*123.025 MHz - Unicom - Uncontrolled Airports - air to air traffic advisory frequency in some areas 123.02 MHz
	*123.050 MHz - Unicom - Uncontrolled Airports - air to air traffic advisory frequency in some areas 123.05 MHz		*123.050 MHz - Unicom - Uncontrolled Airports - air to air traffic advisory frequency in some areas 123.05 MHz
	*123.075 MHz - Unicom - Uncontrolled Airports - air to air traffic advisory frequency in some areas 123.07 MHz		*123.075 MHz - Unicom - Uncontrolled Airports - air to air traffic advisory frequency in some areas 123.07 MHz
-	*121.950 MHz - Gliders and balloons, air-to-air and air-to-ground	+	*121.950 MHz - Gliders and balloons, air-to-air and air-to-ground 121.95 MHz
-	*123.300 MHz - Gliders and balloons, air-to-air and air-to-ground - flight training frequency	+	*123.300 MHz - Gliders and balloons, air-to-air and air-to-ground - flight training frequency 123.3 MHz
	*123.500 MHz - Gliders and balloons, air-to-air and air-to-ground - flight training frequency - balloons and some gliders also use VHF/UHF [[Business_Radio#Common_Itinerant_and_Low_Power_Business_Frequencies\|Business Band]] frequencies		*123.500 MHz - Gliders and balloons, air-to-air and air-to-ground - flight training frequency - balloons and some gliders also use VHF/UHF [[Business_Radio#Common_Itinerant_and_Low_Power_Business_Frequencies\|Business Band]] frequencies
-	*123.325 MHz - Air To Air / Air To Ground - Blimp Operations (other frequencies used, including on the VHF/UHF Business Band)	+	*123.325 MHz - Air To Air / Air To Ground - Blimp Operations (other frequencies used, including on the VHF/UHF Business Band) 123.32 MHz

	===Long Range VHF Networks===		===Long Range VHF Networks===