47.000 - 49.670 MHz Business Band
49.670 - 50.000 MHz Portable Phones
50.000 - 54.000 MHz Amateur Radio
54.000 - 72.000 MHz VHF Television (Ch 2 - 4)
Television Channels are 6 MHz wide
Video is Fo + 1.25 MHz
Audio is Video + 4.5 MHz
Color Burst is Video + 3.5795 MHz
72.000 - 76.000 MHz Model Radio Control, Aviation and Industry
75.000 MHz is Aircraft Navigation Marker Beacon. This is near
airports on the ILS (Instrument Landing System) course. Three lights
are in the cockpit (Purple, Amber, White):
Purple - Outer Marker, Intercept Point, 4 to 7 Miles downrange
Two 400 Hz Dashes Per Second.
Amber - Middle Marker, Cat I Decision Height, 3500 Feet
downrange, 1300 Hz Dot and Dashes 95 times a minute.
White - Inner Marker, Cat II Decision Height, 3000 Feet
downrange, Six 3000 Hz Dots Per Seco nd.
122.700, 122.725, 122.800, 122.925,
122.975, 123.000, 123.050, 123.075 - UNICOM frequencies
122.900 - MULTICOM frequency
123.050, 123.075 - Heliports
122.750 - Air to Air Communications
122.975 - Air to Air Communications for high altitudes (airliners)
123.450 - Air to Air Communications (Trans-ocean get together, etc)
121.600 - CAP practice ELT search (under authorized missions only)
121.700, 121.800, 121.900 - Ground control frequencies.
136.000 - 138.000 MHz Weather Satellite, Government, Business
138.000 - 144.000 MHz Government (Military Bases)
144.000 - 148.000 MHz Amateur Radio
148.000 - 151.000 MHz Government, CAP, CD, MARS
151.000 - 156.250 MHz Business Band (Police, Fire)
156.250 - 157.425 MHz Marine Band
156.800 Marine Emergency "Guard"
157.450 - 160.200 MHz Business Band (Police, Fire)
160.200 - 161.600 MHz Railroad (161.600 is Marine Band)
161.605 - 161.795 MHz Business Band (Radio and V Remotes)
161.800 - 162.000 MHz Marine Band (Telephone)
162.000 - 174.000 MHz Government, Some Business (Radio and TV Remotes)
This is the common "Government Band", frequency spacing
is typically 12.5 kHz, other users are 5 kHz spacing
400.000 - 420.000 MHz Government (Base Walkie/Talkies, Pagers, etc)
420.000 - 450.000 MHz Amateur Radio
450.000 - 470.000 MHz Business Band (Police, Fire, Radio and TV Remotes)
470.000 - 890.000 MHz UHF Television (Ch 14 - 83)
(All channels not used anymore, 70 - 83 Obsolete)
806.000 - 810.000 MHz Business Band (Conventional Systems, Mobile Input)
810.000 - 816.000 MHz Public Safety (Slow Growth Systems, Mobile Input)
816.000 - 821.000 MHz Business Band (Trunked Systems, Mobile Input)
821.000 - 825.000 MHz Land Mobile Satellite Service (Mobile Input)
825.000 - 835.000 MHz Cellular Telephone Non-Wireline (Mobile Input)
835.000 - 845.000 MHz Cellular Telephone Wireline (Mobile Input)
845.000 - 850.000 MHz Cellular Telephone (Expansion, Mobile Input)
850.000 - 851.000 MHz Unallocated
851.000 - 855.000 MHz Business Band (Conventional systems, Base Output)
855.000 - 861.000 MHz Public Safety (Slow Growth Systems, Base Output)
861.000 - 866.000 MHz Business Band (Trunked Systems, Base Output)
866.000 - 870.000 MHz Land Mobile Satellite Service (Satellite Output)
870.000 - 880.000 MHz Cellular Telephone Non-Wireline (Base Output)
880.000 - 890.000 MHz Cellular Telephone Wireline (Base Output)
890.000 - 895.000 MHz Cellular Telephone (Expansion, Base Output)
895.000 - 902.000 MHz Land Mobile Radio (Mobile Input)
902.000 - 928.000 MHz Free-For-All, No use near White Sands, and Denver
928.000 - 930.000 MHz Multi-Address Paging
930.000 - 931.000 MHz Advanced Technology Paging
931.000 - 932.000 MHz Common Carrier Paging
932.000 - 935.000 MHz Government/Private Shared
935.000 - 941.000 MHz Land Mobile Radio (Base Output)
941.000 - 944.000 MHz Government/Private Shared
944.000 - 947.000 MHz Broadcast Studio To Transmitter Link
947.000 - 952.000 MHz Broadcast Radio Services
952.000 - 960.000 MHz Microwave Relay and Paging
960.000 -1240.000 MHz TACAN/DME, RADAR/IFF, Government
TACAN has 126 X and 126 Y channels. Normally only X channels
are used, unless crowded. TACAN frequencies are tied to VOR
frequencies. (Note: there are more TACAN frequencies than
VOR frequencies, some are blanked around the ATCRBS Beacon
frequencies, and others are for expansion and military use).
Pulse widths are 3.5 microseconds. Aircraft sounds like a Top
Fuel Dragster or Funny Car when searching for lock-on.
A third pulse is also included in all modes (except 4) at
2 microseconds from the first. This is the sidelobe pulse.
if it's within @6 dB of the first pulse (or greater) the
transponder doesn't reply (as it has detected an antenna
sidelobe). Pulse widths are .8 microseconds.
The reply is two framing pulses spaced 20.3 microseconds apart,
with 13 code pulses (0000 - 7777 Octal) and an X pulse at the
center which is not used anymore). A fourth pulse (called SPI
pulse (Special Position Identifier) is used to identify your
s position when asked by a controller to "Squawk Ident", it is
4.35 microseconds after the last framing pulse and lasts for
20 seconds (about 2 scans of a long range radar). Pulse widths
are .45 microseconds.
1575.42 MHz is the Navstar Global Positioning System (GPS)
frequency L1, and 1227.6 MHz is L2.
