CB Radio
From HFUnderground
For more information, see the detailed CB page here.
American CB radio band plan. This is the same band plan used by most countries worldwide, including all of North America, South America, Europe, the UK, Australia and numerous other locations.
US regulations limit RF output power to 4 watts in FM mode, 4 watts AM carrier power and 12 watts SSB PEP (peak power). 4w AM carrier power equates to 16 watts peak power (PEP) at 100% modulation.
US regulations permit use of AM, FM and SSB voice modes. AM mode (A3E) must be full carrier double side band with a maximum bandwidth of 8 kHz. FM mode (F3E) is limited to 8 kHz bandwidth. SSB mode may be USB or LSB. Regular suppressed-carrier SSB (J3E) as well as reduced-carrier SSB (R3E) and full-carrier SSB (H3E) are all permitted, with a maximum bandwidth of 4 kHz.
CB radio service (CBRS) emission designators:
- AM voice, amplitude modulation double side band with full carrier - 8K00A3E
- FM voice, frequency modulation - 8K00F3E
- SSB voice, single side band with suppressed carrier - 4K00J3E
- SSB voice, single side band with reduced carrier - 4K00R3E
- SSB voice, single side band with full carrier - 4K00H3E
Bandwidth limits are 8 kHz for AM mode (8K00A3E), 8 kHz for FM (8K00F3E), and 4 kHz for SSB. SSB with carrier (4K00H3E), SSB with reduced carrier (4K00R3E), and true SSB without carrier (4K00J3E) are allowed. Use of selective calling systems, including tone-based selective calling such as DTMF, ANI, etc. as well as CTCSS tone squelch (PL) and DCS coded squelch (DPL) are permitted.
FCC CB regulations require that all CB equipment has the capability to operate in AM mode as the "default mode". In Europe, FM is the "default mode".
The CE (CEPT) Europe-wide standard 27 MHz band CB radio regulations permit FM voice mode only (4 watt power limit). EU mode is identical, except AM and SSB are also allowed (same requirements as the US FCC CB band).
40 channel CB radio band plan.
Standard 40 Channel CB Radio Channel Frequencies Band Plan - American CB Radio Band Plan, European mid band band plan, CEPT CB band, EU CB radio band, "legal 40", etc.
Channel...............................................................Frequency (MHz)
- 1...................................................................... 26.965 MHz
- 2...................................................................... 26.975 MHz
- 3...................................................................... 26.985 MHz
- 4...................................................................... 27.005 MHz
- 5...................................................................... 27.015 MHz
- 6...................................................................... 27.025 MHz
- 7...................................................................... 27.035 MHz
- 8...................................................................... 27.055 MHz
- 9...................................................................... 27.065 MHz
- 10.................................................................... 27.075 MHz
- 11.................................................................... 27.085 MHz
- 12.................................................................... 27.105 MHz
- 13.................................................................... 27.115 MHz
- 14.................................................................... 27.125 MHz
- 15.................................................................... 27.135 MHz
- 16.................................................................... 27.155 MHz
- 17.................................................................... 27.165 MHz
- 18.................................................................... 27.175 MHz
- 19.................................................................... 27.185 MHz
- 20.................................................................... 27.205 MHz
- 21.................................................................... 27.215 MHz
- 22.................................................................... 27.225 MHz
- 23.................................................................... 27.255 MHz
- 24.................................................................... 27.235 MHz
- 25.................................................................... 27.245 MHz
- 26.................................................................... 27.265 MHz
- 27.................................................................... 27.275 MHz
- 28.................................................................... 27.285 MHz
- 29.................................................................... 27.295 MHz
- 30.................................................................... 27.305 MHz
- 31.................................................................... 27.315 MHz
- 32.................................................................... 27.325 MHz
- 33.................................................................... 27.335 MHz
- 34.................................................................... 27.345 MHz
- 35.................................................................... 27.355 MHz
- 36.................................................................... 27.365 MHz
- 37.................................................................... 27.375 MHz
- 38.................................................................... 27.385 MHz
- 39.................................................................... 27.395 MHz
- 40.................................................................... 27.405 MHz
UK FM 27/81 CB Band Plan UK Only Allocation, FM mode only
The UK has 80 CB radio channels available for legal use.
The "27/81" band (the original UK FM CB radio allocation) is a 40 channel CB allocation, NFM mode only, 10 kHz channel spacing, with all channel frequencies purposely offset 1.25 kHz. The 27/81 CB radio regulations originally required all equipment to have a high/low power switch (often called a -10dB switch or a 4w/0.4w switch), to allow the operator to reduce transmit power from the 4 watt legal maximum to 0.4 watt or 400mW. This is no longer a requirement, although there is still a large installed base of original 27/81 specification equipment in use in the UK. The UK FM 27/81 band does not skip channels like the regular mid band 40 channel legal CB allocation, nor does it feature the out-of-order channel sequence for channels 23, 24 and 25. Channel plan is a straight 10 kHz step channel plan the whole way through.
The standard EU 40 channel "mid band" or "FCC band" is also available in the UK. AM, FM and SSB modes are permitted on the EU standard (CEPT band, FCC band, mid band, American CB band, etc.). See the band plan above.
UK FM CB 27/81 27.60125 MHz - 27.99125 MHz. Regulations actually call this allocation 27.59625 MHz to 27.99625 MHz but most sources simply list 27.6 MHz to 28 MHz or 27.600 MHz to 27.995 MHz if they don't go with 27.60125 - 27.99125 MHz or something similar like 27.601 MHz FM - 27.991 MHz FM.
Channel...............................................................Frequency (MHz)
- 1...................................................................... 27.60125 MHz
- 2...................................................................... 27.61125 MHz
- 3...................................................................... 27.62125 MHz
- 4...................................................................... 27.63125 MHz
- 5...................................................................... 27.64125 MHz
- 6...................................................................... 27.65125 MHz
- 7...................................................................... 27.66125 MHz
- 8...................................................................... 27.67125 MHz
- 9...................................................................... 27.68125 MHz
- 10.................................................................... 27.69125 MHz
- 11.................................................................... 27.70125 MHz
- 12.................................................................... 27.71125 MHz
- 13.................................................................... 27.72125 MHz
- 14.................................................................... 27.73125 MHz
- 15.................................................................... 27.74125 MHz
- 16.................................................................... 27.75125 MHz
- 17.................................................................... 27.76125 MHz
- 18.................................................................... 27.77125 MHz
- 19.................................................................... 27.78125 MHz
- 20.................................................................... 27.79125 MHz
- 21.................................................................... 27.80125 MHz
- 22.................................................................... 27.81125 MHz
- 23.................................................................... 27.82125 MHz
- 24.................................................................... 27.83125 MHz
- 25.................................................................... 27.84125 MHz
- 26.................................................................... 27.85125 MHz
- 27.................................................................... 27.86125 MHz
- 28.................................................................... 27.87125 MHz
- 29.................................................................... 27.88125 MHz
- 30.................................................................... 27.89125 MHz
- 31.................................................................... 27.90125 MHz
- 32.................................................................... 27.91125 MHz
- 33.................................................................... 27.92125 MHz
- 34.................................................................... 27.93125 MHz
- 35.................................................................... 27.94125 MHz
- 36.................................................................... 27.95125 MHz
- 37.................................................................... 27.96125 MHz
- 38.................................................................... 27.97125 MHz
- 39.................................................................... 27.98125 MHz
- 40.................................................................... 27.99125 MHz
German 80 Channel CB Radio Channels
These channels are authorized in several other countries in Europe in addition to Germany. Channels 1-40 are identical to the standard EU 40 mid band 40 CB channels US CB radio channels CE / CEPT mid band channels, etc. On channels 1-40, AM, FM and SSB voice are allowed. Digital modes such as AX.25 packet, ROS, PSK31, FT8 and various others are allowed on channels specified for this use by German law.
Standard 40 Channel CB Radio Channel Frequencies Band Plan - American CB Radio Band Plan, European mid band band plan, CEPT CB band, EU CB radio band, "legal 40", etc.
Standard 40 Channel CB Radio Channel Frequencies Band Plan - American CB Radio Band Plan, European mid band band plan, CEPT CB band, EU CB radio band, "legal 40", etc.
Standard 40 Channel CB Radio Channel Frequencies Band Plan - American CB Radio Band Plan, European mid band band plan, CEPT CB band, EU CB radio band, "legal 40", etc.
Standard 40 Channel CB Radio Channel Frequencies Band Plan - American CB Radio Band Plan, European mid band band plan, CEPT CB band, EU CB radio band, "legal 40", etc.
Standard 40 Channel CB Radio Channel Frequencies Band Plan - American CB Radio Band Plan, European mid band band plan, CEPT CB band, EU CB radio band, "legal 40", etc.
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