A television station broadcast Radio Frequency (RF) channel is allocated 6 MHz of bandwidth for over-the-air transmission in part of the VHF or UHF Radio Frequency Band. Each RF channel can carry multiple TV channels.
Band | Nomenclature | Frequency |
---|---|---|
ELF | Extremely Low Frequency | 3 - 30 Hz |
SLF | Super Low Frequency | 30 - 300 Hz |
ULF | Ultra Low Frequency | 300 - 3000 Hz |
VLF | Very Low Frequency | 3 - 30 kHz |
LF | Low Frequency | 30 - 300 kHz |
MF | Medium Frequency | 300 - 3000 kHz |
HF | High Frequency | 3 - 30 MHz |
VHF | Very High Frequency | 30 - 300 MHz |
UHF | Ultra High Frequency | 300 - 3000 MHz |
SHF |
Super High Frequency Microwaves |
3 - 30 GHz |
EHF |
Extremely High Frequency Millimeter Waves |
30 - 300 GHz |
Hz kHz MHz GHz |
-- Hertz -- kilohertz -- Megahertz -- Gigahertz |
Cycles per Second Thousand Million Billion |
Television Frequency Bands |
||
---|---|---|
Band |
RF Channels |
Frequency MHz |
VHF VHF-Lo VHF-Hi |
02 - 13 02 - 06 07 - 13 |
54 - 216 54 - 88 174 - 216 |
UHF | 14 - 36 | 470 - 608 |
Calculate RF Channel Wavelength |
---|
RF Channel:
RF Ch |
Police 10 Codes includes Basic Scanner Frequencies Police10codes.com |
VHF Band 54 - 216 MHz 1947 to present
12 VHF Band RF Channels |
VHF-Lo 54 - 88 MHz
5 VHF-Lo Channels |
VHF-Hi 174 - 216 MHz
7 VHF-Hi Channels |
RF Channels 14 - 36
470 - 608 MHz July 1952 to present
23 RF Channels |
RF Channels 37 - 51 608 - 698 MHz July 1952 to 2023
15 RF Channels |
RF Channels 52 - 69 698 - 806 MHz July 1952 to June 2020
18 RF Channels |
RF Channels 70 - 83 806 - 890 MHz July 1952 to 1983
14 RF Channels |
* RF Channel 37 -- Radio Astronomy
In 1963 Channel 37 (608-614 MHz) was reserved for radio astronomy research conducted by the University of Illinois’s Vermilion River Observatory
(40.0611°, -87.5511°)
near Danville, IL. From 1959 to 1970 the observatory used a 400 foot wide by 600 foot long linear parabolic radio telescope to focus on 3 frequencies, 410, 610 and 1400 MHz. Channel 37 transmissions within 600 miles of the observatory would interfere with the 610 MHz frequency. In 1963 the FCC reserved channel 37 for radio astronomy. The Observatory closed in 1981 and was decommissioned in 1984, but RF channel 37 remains reserved.
Spectrum History
In the 1950's there were very few TV UHF broadcast. In the 1960's the number of UHF broadcast started increasing, but never came close to the number of VHF stations until digital broadcast started in 2009. Today UHF stations far outnumber VHF stations.
The Television allocated spectrum has been reduced over the years.
Year | VHF RF Channels |
UHF RF Channels |
Total RF Channels |
---|---|---|---|
1947 | 2-13 | none | 12 |
1952 | 2-13 | 14 - 83 | 82 |
1963 | 2-13 | 14 - 36 38 - 83 |
81 |
1983 | 2-13 | 14 - 36 38 - 69 |
67 |
2020 | 2-13 | 14 - 36 38 - 51 |
49 |
2023 | 2-13 | 14 - 36 | 35 |
OTA DTv
Television Broadcast Frequencies |