Citizens Band radio in India

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Small black mobile radio with hand-held microphone and long, coiled mic cord
Cobra 18 WX ST II mobile CB radio with microphone

Citizens' Band radio (also known as CB radio) is a system of short-distance radio communications between individuals on a selection of 40 channels within the 27-MHz (11 m) band. Citizens' Band is distinct from the Family Radio Service, GMRS, Multi-Use Radio Service and amateur radio (Ham). In many countries CB operation does not require a license, and (unlike amateur radio) it may be used for business or personal communications. Like many other two-way radio services, any Citizens' Band channel is shared by many users. Only one station may transmit in a channel at a time; other stations must listen and wait for the shared channel to be available. Also, the system works in half-duplex mode, which means we may transmit and receive information, but not both at the same time.

Regulation in India[edit]

CB antenna with loading coil, mounted on pickup-truck metal tool box
Typical center-loaded mobile CB antenna. Note the loading coil, which shortens the antenna's overall length.

The channel assignments in India are different from the band plans used elsewhere. The Indian band plan consists of 40 frequencies spaced a relatively tight eight kHz apart, plus a few offset channels used for mountaineering and radio-controlled devices. Many of the channels are reserved for specific purposes such as forestry, disaster relief, and sporting events. The frequency band allocated for this purpose in India is 26.957-27.283 MHz. Nonetheless, the effective radiating power used for Citizens Band is limited within 5 Watt in India.[1]

Indian CB channels [2]
Frequency Usage
26.964 Hobbyist comms
26.968 [offset] Mountaineering
26.972 Hobbyist comms
26.976 [offset] Mountaineering
26.980 Highway comms
26.988 spare
26.996 spare
27.004 Radio-controlled model aircraft
27.012 Rural comms
27.020 Radio-controlled devices, ex. garage door openers, alarms
27.028 Rural comms
27.036 Hobbyist comms
27.044 Highway emergency ( to contact police )
27.052 Highway emergency ( to contact EMS )
27.060 Marine lifesaving comms
27.068 Marine lifesaving comms
27.076 Disaster relief
27.084 Disaster relief
27.092 Forestry
27.100 Forestry
27.108 Radio-controlled devices, ex. garage door openers, alarms
27.116 Radio-controlled model aircraft
27.124 Hobbyist comms
27.132 spare
27.140 Mountaineering
27.148 Radio-controlled model aircraft
27.155 [offset] Radio-controlled models, general
27.156 Radio-controlled model aircraft
27.164 spare
27.172 Rural comms
27.180 spare
27.188 spare
27.196 spare
27.204 Mountaineering
27.212 Rural comms
27.220 Sports events
27.225 [offset] Radio-controlled models, general
27.228 Radio-controlled model aircraft
27.236 Highway comms
27.244 Sports events
27.250 [offset] Radio-controlled toys and gadgets
27.252 spare
27.260 Radio-controlled toys and gadgets
27.268 spare
27.276 spare

Popular use[edit]

Citizens Band radio is a good option for long-haul truck drivers to communicate directions, traffic problems and other relevant matters.[3]

See also[edit]

References[edit]

  1. ^ "WPA Notification on Citizens Band". WPA Coordinating Committee. Wireless Planning Commission of India. 12 August 2005. Retrieved August 30, 2012. 
  2. ^ WPC: Remarks in the National Frequency Allocation Table
  3. ^ Alice Adams Trucking:Tractor-Trailer Driver Handbook/Workbook, page 558, the first DB radio