Difference between revisions of "Talk:Radio Frequencies, Bands, and Channels"

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== The difference between mHz and MHz ==
 +
 +
SI units:
 +
 +
*the "m" prefix is a modifier meaning 1/1,000th of the units that follow.
 +
*the "M" prefix is a modifier meaning 1,000,000 times the units that follow.
 +
 +
A frequency of 49mHz = 0.049 Hz, while a frequency of 49MHz = 49,000,000 Hz.

Revision as of 10:44, 11 April 2016

ince VHF and UHF propagation is usually "line of sight," frequency allocations and usage are far more "localized" on frequencies above 30 MHz. However, there are some broad allocations for different purposes used in the United States and most of the rest of the Americas. The following is a summary of the main frequency bands found above 30 MHz. Please remember that listening to cellular phones, cordless phones and wireless intercoms is illegal in the United States.

30 to 50 MHz: This is known as the "VHF low" band. Most transmissions will be in narrow band FM with channels spaced at 20 kHz intervals. A wide variety of stations can be heard on this range, including businesses, federal, state, and local governments, law enforcement agencies, and various industrial radio services.

50 to 54 MHz: This is the six-meter ham radio band. The first megahertz is mainly used for USB, AM, CW, FSK modes, digital modes. The remainder of the band is used for narrow band FM, both simplex and through repeaters. 52.525 MHz is widely used as a simplex and calling frequency.

54 to 72 MHz: Television channels 2, 3, and 4 are located in this range. The video portions will sound like distorted noise on a scanner. The audio portions are in FM, but will sound "clipped" and "tinny" unless your scanner can tune this range in wide band.

72 to 76 MHz: This range is used for remote control signals for model airplanes and garage door openers, wireless microphones (including those used by law enforcement agencies), and two-way communications inside factories, warehouses, and other industrial facilities. Most channels are spaced at 20 kHz intervals.

76 to 88 MHz: This range is used for television channels 5 and 6.

88 to 108 MHz: This is where the FM broadcasting band is located.

108 to 136 MHz: This band is used for civilian aeronautical communications and all transmissions are in AM. Aeronautical beacons occupy 108 to 118 MHz; these continuously transmit a station identification and are used for navigation. The rest of the band is used for traffic between aircraft and air traffic control towers on channels spaced at 25 kHz intervals.

136 to 138 MHz: This segment is mainly used by weather satellites to transmit photographic images.

138 to 144 MHz: The various military services are the biggest users of this segment in the United States, with most transmissions in narrow band FM and spaced at 5 kHz intervals. You can also hear ham radio operators who are members of the military affiliate radio service (MARS).

144 to 148 MHz: This is the two-meter ham radio band. This is the most heavily used ham radio band in the United States. USB and various FSK modes are mainly used in the first 500 kHz, and the rest of the band is FM. Most activity is through repeaters, although simplex activity is found on frequencies like 146.52 MHz. For more information about this band, visit the ham radio section of this site.

148 to 150.8 MHz: The usage here is similar to the 138 to 144 MHz range.

150.8 to 174 MHz: This is known as the "VHF high" band, and it is used by the same wide spectrum of users as the 30 to 50 MHz band.

174 to 216 MHz: This range is used for television channels 7 through 13.

216 to 220 MHz: In the United States, this band is used by the automated maritime telecommunication system (AMTS) used on major inland waterways such as the Great Lakes and the Mississippi river. Communications are in FM on channels spaced at 12.5 kHz intervals. However, the 219 to 220 MHz range is shared with ham radio. On this range, ham stations can be used to relay digital messages to other hams, subject to a maximum power of 50 watts. Hams must first register to use their shared allocation, and cannot use it within range of maritime users.

220 to 222 MHz: This range was reallocated a few years ago from ham radio to land mobile radio. Frequency usage and modulation have not yet been finalized, although new narrow bandwidth modes are expected to be used.

222 to 225 MHz: This is the 1.25-meter ham radio band. It is mainly used for FM communication through repeaters, although it is much less heavily used than the two-meter band.

225 to 400 MHz: This very wide band is used for military aviation communications in AM. Most channels are 100 kHz apart.

400 to 406 MHz: This range is used primarily by government and military stations in FM.

406 to 420 MHz: In the United States, this band is used exclusively by the federal government. All transmissions are in FM, with most channels spaced at 25 kHz intervals.

420 to 450 MHz: This is the 70-centimeter ham radio band, second in popularity to the two-meter band on VHF/UHF. The 420 to 444 MHz range is used for USB, digital modes, ham television, and ham communications satellites. The 444 to 450 MHz range is used for FM, mainly in conjunction with repeaters.

450 to 470 MHz: This is the "UHF" band on most scanners, used for many of the same purposes as the 30 to 50 and 150.8 to 174 MHz bands.

470 to 512 MHz: This is known as the "UHF-T" band, and covers the same frequency range as television channels 14 to 20. This band is used for many of the same purposes as the "UHF" band in areas of the country without television stations on those channels.

512 to 825 MHz: This range is where television channels 21 through 72 are located.

825 to 849 MHz: This range is used for cellular telephone service, with cellular units transmitting here. Listening in this range is prohibited.

849 to 851 MHz: This band is used to provide telephone service from aircraft in flight. SSB is generally used here. Listening in this range is prohibited.

851 to 866 MHz: This is used by many of the same users as the 450 to 470 MHz band, with channels spaced at 25 kHz intervals.

866 to 869 MHz: This allocation is used by public safety and law enforcement agencies.

869 to 894 MHz: This range is used for cellular telephone service, with cells transmitting here. Listening in this range is prohibited.

894 MHz and above: These higher frequencies are where new communications technologies, such as wireless local area networks, spread spectrum telephony, and direct satellite broadcasting are being implemented.

kb8lxc frequency table

United States Frequency List
From To For Memo
1.800 MHz 2.000 MHz Amateur Radio 160m Band
3.500 MHz 4.000 MHz Amateur Radio 80m Band
7.000 MHz 7.300 MHz Amateur Radio 40m Band
10.100 MHz 10.150 MHz Amateur Radio 30m Band
14.000 MHz 14.350 MHz Amateur Radio 20m Band
18.068 MHz 18.168 MHz Amateur Radio 17m Band
21.000 MHz 21.450 MHz Amateur Radio 15m Band For Long Distance
24.890 MHz 24.990 MHz Amateur Radio 12m Band
26.965 MHz 26.965 MHz CB Channel 1 a.k.a. 11m Band (Not Amatuer Radio)
26.975 MHz 26.975 MHz CB Channel 2 a.k.a. 11m Band (Not Amatuer Radio)
26.985 MHz 26.985 MHz CB Channel 3 a.k.a. 11m Band (Not Amatuer Radio)
27.005 MHz 27.005 MHz CB Channel 4 a.k.a. 11m Band (Not Amatuer Radio)
27.015 MHz 27.015 MHz CB Channel 5 a.k.a. 11m Band (Not Amatuer Radio)
27.025 MHz 27.025 MHz CB Channel 6 a.k.a. 11m Band (Not Amatuer Radio)
27.035 MHz 27.035 MHz CB Channel 7 a.k.a. 11m Band (Not Amatuer Radio)
27.055 MHz 27.055 MHz CB Channel 8 a.k.a. 11m Band (Not Amatuer Radio)
27.065 MHz 27.065 MHz CB Channel 9 Emergency Only. a.k.a. 11m Band (Not Amatuer Radio)
27.075 MHz 27.075 MHz CB Channel 10 a.k.a. 11m Band (Not Amatuer Radio)
27.085 MHz 27.085 MHz CB Channel 11 a.k.a. 11m Band (Not Amatuer Radio)
27.105 MHz 27.105 MHz CB Channel 12 a.k.a. 11m Band (Not Amatuer Radio)
27.115 MHz 27.115 MHz CB Channel 13 a.k.a. 11m Band (Not Amatuer Radio)
27.125 MHz 27.125 MHz CB Channel 14 a.k.a. 11m Band (Not Amatuer Radio)
27.135 MHz 27.135 MHz CB Channel 15 a.k.a. 11m Band (Not Amatuer Radio)
27.155 MHz 27.155 MHz CB Channel 16 a.k.a. 11m Band (Not Amatuer Radio)
27.165 MHz 27.165 MHz CB Channel 17 a.k.a. 11m Band (Not Amatuer Radio)
27.175 MHz 27.175 MHz CB Channel 18 a.k.a. 11m Band (Not Amatuer Radio)
27.185 MHz 27.185 MHz CB Channel 19 a.k.a. 11m Band (Not Amatuer Radio)
27.205 MHz 27.205 MHz CB Channel 20 a.k.a. 11m Band (Not Amatuer Radio)
27.215 MHz 27.215 MHz CB Channel 21 a.k.a. 11m Band (Not Amatuer Radio)
27.225 MHz 27.225 MHz CB Channel 22 a.k.a. 11m Band (Not Amatuer Radio)
27.255 MHz 27.255 MHz CB Channel 23 a.k.a. 11m Band (Not Amatuer Radio)
27.235 MHz 27.235 MHz CB Channel 24 a.k.a. 11m Band (Not Amatuer Radio)
27.245 MHz 27.245 MHz CB Channel 25 a.k.a. 11m Band (Not Amatuer Radio)
27.265 MHz 27.265 MHz CB Channel 26 a.k.a. 11m Band (Not Amatuer Radio)
27.275 MHz 27.275 MHz CB Channel 27 a.k.a. 11m Band (Not Amatuer Radio)
27.285 MHz 27.285 MHz CB Channel 28 a.k.a. 11m Band (Not Amatuer Radio)
27.295 MHz 27.295 MHz CB Channel 29 a.k.a. 11m Band (Not Amatuer Radio)
27.305 MHz 27.305 MHz CB Channel 30 a.k.a. 11m Band (Not Amatuer Radio)
27.315 MHz 27.315 MHz CB Channel 31 a.k.a. 11m Band (Not Amatuer Radio)
27.325 MHz 27.325 MHz CB Channel 32 a.k.a. 11m Band (Not Amatuer Radio)
27.335 MHz 27.335 MHz CB Channel 33 a.k.a. 11m Band (Not Amatuer Radio)
27.345 MHz 27.345 MHz CB Channel 34 a.k.a. 11m Band (Not Amatuer Radio)
27.355 MHz 27.355 MHz CB Channel 35 a.k.a. 11m Band (Not Amatuer Radio)
27.365 MHz 27.365 MHz CB Channel 36 a.k.a. 11m Band (Not Amatuer Radio)
27.375 MHz 27.375 MHz CB Channel 37 a.k.a. 11m Band (Not Amatuer Radio)
27.385 MHz 27.385 MHz CB Channel 38 a.k.a. 11m Band (Not Amatuer Radio)
27.395 MHz 27.395 MHz CB Channel 39 a.k.a. 11m Band (Not Amatuer Radio)
27.405 MHz 27.405 MHz CB Channel 40 a.k.a. 11m Band (Not Amatuer Radio)
28.000 MHz 29.700 MHz Amateur Radio 10m Band For Long Distance
30.820 MHz 30.820 MHz Restaurant KFC
30.840 MHz 30.840 MHz Restaurant Arby's, Bob's Big Boy, Burger King, Hardee's, KFC, McDonald's, Taco Bell, Wendy's
31.000 MHz 31.000 MHz Restaurant Arby's, Burger King, Hardee's, KFC, McDonald's
33.400 MHz 33.400 MHz Restaurant KFC
33.140 MHz 33.140 MHz Restaurant McDonald's
33.160 MHz 33.160 MHz Restaurant Wendy's
33.400 MHz 33.400 MHz Restaurant McDonald's, Wendy's
33.715 MHz 33.715 MHz Restaurant McDonald's
35.020 MHz 35.020 MHz Restaurant Hardee's, McDonald's
35.120 MHz 35.120 MHz Restaurant McDonald's
43.720 MHz 43.720 MHz Cordless Phone
43.740 MHz 43.740 MHz Cordless Phone
43.820 MHz 43.820 MHz Cordless Phone
43.840 MHz 43.840 MHz Cordless Phone
43.920 MHz 43.920 MHz Cordless Phone
43.960 MHz 43.960 MHz Cordless Phone
44.120 MHz 44.120 MHz Cordless Phone
44.160 MHz 44.160 MHz Cordless Phone
44.180 MHz 44.180 MHz Cordless Phone
44.200 MHz 44.200 MHz Cordless Phone
44.320 MHz 44.320 MHz Cordless Phone
44.360 MHz 44.360 MHz Cordless Phone
44.400 MHz 44.400 MHz Cordless Phone
44.460 MHz 44.460 MHz Cordless Phone
44.480 MHz 44.480 MHz Cordless Phone
44.890 MHz 44.890 MHz Restaurant Wendy's
46.610 MHz 46.610 MHz Cordless Phone
46.630 MHz 46.630 MHz Cordless Phone
46.670 MHz 46.670 MHz Cordless Phone
46.710 MHz 46.710 MHz Cordless Phone
46.730 MHz 46.730 MHz Cordless Phone
46.770 MHz 46.770 MHz Cordless Phone
46.830 MHz 46.830 MHz Cordless Phone
46.870 MHz 46.870 MHz Cordless Phone
46.930 MHz 46.930 MHz Cordless Phone
46.970 MHz 46.970 MHz Cordless Phone
49.300 MHz 49.300 MHz Baby Monitor
49.830 MHz 49.830 MHz Baby Monitor/Restaurant Wendy's
49.845 MHz 49.845 MHz Baby Monitor
49.860 MHz 49.860 MHz Baby Monitor
49.875 MHz 49.875 MHz Baby Monitor
49.890 MHz 49.890 MHz Baby Monitor
49.830 MHz 213.800 MHz Wireless Mike
50.000 MHz 54.000 MHz Amateur Radio 6m Band
67.775 MHz 67.775 MHz Restaurant McDonald's
88.000 MHz 108.000 MHz Public FM Radio
108.500 MHz 135.900 MHz Aviation
144.000 MHz 148.000 MHz Amateur Radio 2m Band Most Popular Band for Hams. It is also popular for satellite communications.
151.685 MHz 151.685 MHz Restaurant Hardee's
154.490 MHz 154.490 MHz Restaurant McDonald's
154.540 MHz 154.540 MHz Restaurant KFC
154.570 MHz 154.570 MHz Commercial/Restaurant Wal-Mart Stores/Arby's, Bob's Big Boy, Burger King, Taco Bell
154.600 MHz 154.600 MHz Commercial Wal-Mart Stores
170.065 MHz 170.065 MHz Department of Corrections Federal Prisons
170.875 MHz 170.875 MHz Department of Corrections Federal Prisons
170.925 MHz 170.925 MHz Department of Corrections Federal Prisons
170.305 MHz 170.305 MHz Restaurant Burger King, Hardee's
220.000 MHz 225.000 MHz Amateur Radio 1.25m Band
430.000 MHz 450.000 MHz Amateur Radio 70cm Band Popular Band for Hams
457.5375 MHz 457.5375 MHz Restaurant Taco Bell
457.550 MHz 457.550 MHz Restaurant Arby's, Taco Bell
457.600 MHz 457.600 MHz Restaurant Bob's Big Boy
460.8875 MHz 460.8875 MHz Restaurant Wendy's
462.5625 MHz 462.5625 MHz Family Radio Service Ch. 1 "Very Short Distance Two-way Voice Radio Service."
462.5875 MHz 462.5875 MHz Family Radio Service Ch. 2 "Very Short Distance Two-way Voice Radio Service."
462.6125 MHz 462.6125 MHz Family Radio Service Ch. 3 "Very Short Distance Two-way Voice Radio Service."
462.6375 MHz 462.6375 MHz Family Radio Service Ch. 4 "Very Short Distance Two-way Voice Radio Service."
462.6625 MHz 462.6625 MHz Family Radio Service Ch. 5 "Very Short Distance Two-way Voice Radio Service."
462.6875 MHz 462.6875 MHz Family Radio Service Ch. 6 "Very Short Distance Two-way Voice Radio Service."
462.7125 MHz 462.7125 MHz Family Radio Service Ch. 7 "Very Short Distance Two-way Voice Radio Service."
464.475 MHz 464.475 MHz Commercial Wal-Mart Stores
464.520 MHz 464.520 MHz Commercial Wal-Mart Stores
464.6125 MHz 464.6125 MHz Restaurant Hardee's
464.975 MHz 464.975 MHz Commercial Wal-Mart Stores
465.8875 MHz 465.8875 MHz Restaurant Burger King
467.5625 MHz 467.5625 MHz Family Radio Service Ch. 8 "Very Short Distance Two-way Voice Radio Service."
467.5875 MHz 467.5875 MHz Family Radio Service Ch. 9 "Very Short Distance Two-way Voice Radio Service."
467.6125 MHz 467.6125 MHz Family Radio Service Ch. 10 "Very Short Distance Two-way Voice Radio Service."
467.6375 MHz 467.6375 MHz Family Radio Service Ch. 11 "Very Short Distance Two-way Voice Radio Service."
467.6625 MHz 467.6625 MHz Family Radio Service Ch. 12 "Very Short Distance Two-way Voice Radio Service."
467.6875 MHz 467.6875 MHz Family Radio Service Ch. 13 "Very Short Distance Two-way Voice Radio Service."
467.7125 MHz 467.7125 MHz Family Radio Service Ch. 14 "Very Short Distance Two-way Voice Radio Service."
467.8125 MHz 467.8125 MHz Restaurant KFC
467.825 MHz 467.825 MHz Restaurant Bob's Big Boy
469.0125 MHz 469.0125 MHz Restaurant Hardee's
469.475 MHz 469.475 MHz Commercial Wal-Mart Stores
469.525 MHz 469.525 MHz Commercial Wal-Mart Stores
469.975 MHz 469.975 MHz Commercial Wal-Mart Stores
902.000 MHz 928.000 MHz Amateur Radio 33cm Band Not used often
926.100 MHz 926.370 MHz Cordless Phone 10 Chs
1.240 GHz 1.300 GHz Amateur Radio 23cm Band Not used often

The difference between mHz and MHz

SI units:

  • the "m" prefix is a modifier meaning 1/1,000th of the units that follow.
  • the "M" prefix is a modifier meaning 1,000,000 times the units that follow.

A frequency of 49mHz = 0.049 Hz, while a frequency of 49MHz = 49,000,000 Hz.

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