UK CB specifications.
The following specifications refer to the MPT1382 standard. This applies to equipment
placed on the market after 1997.
This is not intended as a complete statement of the requirements, only a general
plain English guide.
Combinations.
Citizens Band equipment may be combined with other receiving equipment, such
as car audio systems. It must not be possible to transmit while any receiver
is operational.
Frequencies.
Equipment may be designed to cover either the UK band, the European band or both.
The conversion of single band CB equipment to dual band is not allowed.
Modulation.
Only Frequency Modulation (FM) and Phase Modulation (PM) may be used.
Deviation.
The maximum deviation is ± 2KHz.
Carrier power.
The maximum allowed RF output power is 4 Watts. For equipment with an integral
antenna, this is the maximum ERP. Otherwise, it is the maximum transmitter
output.
Adjacent channel power.
The maximum allowed adjacent channel power is 20 microwatts.
Audio input.
The equipment may not have connections to allow for external audio input to the
transmitter, other than a microphone and selective calling.
External connections are allowed for devices which do not modulate the transmitter. It
must not be possible to transmit the audio output of such devices.
Frequency tolerance.
The equipment must operate within ± 0.6 kHz of stated channel frequencies.
PLL.
Where a Phase Locked Loop (PLL) is used to generate frequencies, the transmitter
must be disabled whenever the loop is not locked.
Sensitivity.
Where equipment may be used with an external antenna, the maximum receiver sensitivity
is 6 dBµV.
Selectivity.
Equipment with provision for an external antenna must have a minimum of 60dB adjacent
channel attenuation.