Stations of the personal radio service - Citizen's Band (CB) are exempt from licensing provided their operation is in accordance with the following technical requirements:
1. Frequency band
The frequency band allocated to the personal radio service - Citizen's Band (CB) is between 26.960 MHz and 27.410 MHz.
2. Authorised frequencies
Regardless of the emission class used in communications, the frequency of the carrier wave is to be selected from among the frequencies listed in the following table:
2.1 Channel spacing
Channel spacing is 10 KHz.
2.2 Mode of operation
The establishment of alternate communications is permitted on the same frequency or channel (simplex mode on one frequency).
2.3 Distress, emergency and security channel
The 27.065 MHz frequency (channel 9) may only be used for the establishment of distress, emergency and security communications.
2.4 Calling Channel
The 27.085 MHz frequency (channel 11) should only be used in calling communications.
3. Modulation types
The following types of modulation are permitted:
a) amplitude modulation;
b) frequency modulation;
c) phase modulation.
4. Emission classes
4.1 The following emission classes are permitted:
a) telephony in amplitude modulation, double lateral band (A3E);
b) telephone in amplitude modulation, single lateral band with suppressed carrier wave (J3E);
c) telephony in frequency modulation (F3E);
d) telephony in phase modulation (G3E).
4.2. The use of CB stations operating in amplitude modulation, single lateral band with reduced carrier wave (3E) is prohibited.
5. Emission power
5.1 Emitter output power - rated output of the emitter of a CB station may not exceed:
a) 4 Watts of carrier power in the case of amplitude modulated, double lateral band (A3E);
b) 12 Watts of peak power in the case of amplitude modulation, single lateral band with suppressed carrier wave (J3E);
c) 4 Watts of carrier power in the case of frequency modulation (F3E and G3E);
5.2 Effective radiated power (e.r.p.). - maximum permitted e.r.p. is 4 Watts.
- ECC/DEC/(11)03 https://www.anacom.pt/render.jsp?contentId=1366778
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