27Mhz FCC Bandplan
The U.S. 27 MHz FCC bandplan used in Citizens' band radio assigns 40 numbered radio frequency channels between 26.965 MHz (channel 1) and 27.405 MHz (channel 40), with channels generally spaced 10 kHz apart.
There are odd 20 kHz channel spacings between channels 3/4, 7/8, 11/12, 15/16 and 19/20. These 'unused' frequencies are used by remote controlled toys such as toy boats and toy cars. These frequencies cannot be used by remote controlled aircraft, due to interference by CB radio in close proximity, which could crash the plane or helicopter into the ground, an object, or even a person. For this reason model aircraft use only the 72.0~73.0 MHz band instead, which contains 50 channels.
The gap between Channel 22 and Channel 23 (which is then filled by Channels 24 and 25) exists because originally CB radio ended at Channel 23. When the market grew extensively during the 1970s additional channels from 24 to 40 were added to the CB band.
This assignment of channels to frequencies has been adopted by many countries worldwide, including the U.K., although some countries have only approved the use of the first 22 channels.
The channel/frequency allocation for the 40 channels are as follows:
Channel Frequency
Channel 01 26.965 MHz
Channel 02 26.975 MHz
Channel 03 26.985 MHz
Channel 04 27.005 MHz
Channel 05 27.015 MHz
Channel 06 27.025 MHz
Channel 07 27.035 MHz
Channel 08 27.055 MHz
Channel 09 27.065 MHz (emergency channel)
Channel 10 27.075 MHz
Channel 11 27.085 MHz
Channel 12 27.105 MHz
Channel 13 27.115 MHz
Channel 14 27.125 MHz
Channel 15 27.135 MHz
Channel 16 27.155 MHz
Channel 17 27.165 MHz
Channel 18 27.175 MHz
Channel 19 27.185 MHz
Channel 20 27.205 MHz
Channel 21 27.215 MHz
Channel 22 27.225 MHz
Channel 23 27.255 MHz
Channel 24 27.235 MHz
Channel 25 27.245 MHz
Channel 26 27.265 MHz
Channel 27 27.275 MHz
Channel 28 27.285 MHz
Channel 29 27.295 MHz
Channel 30 27.305 MHz
Channel 31 27.315 MHz
Channel 32 27.325 MHz
Channel 33 27.335 MHz
Channel 34 27.345 MHz
Channel 35 27.355 MHz
Channel 36 27.365 MHz
Channel 37 27.375 MHz
Channel 38 27.385 MHz
Channel 39 27.395 MHz
Channel 40 27.405 MHz
The frequency allocation list is supplied by the FCC (Federal Communications Commission) from Part 95 - Subpart D - Rules for CB Service
Citizens Band (CB) Radio Service.
See also: GMRS, FRS, MURS
