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CB radios must include AM or SSB modulation and may include frequency modulation. [5] If a radio includes SSB, it must transmit on the upper sideband with a suppressed, reduced, or full carrier. The unit may also transmit on the lower sideband with carrier as noted. [6]
With the original 23 CB channels SSB stations commonly used channel 16, to avoid interference to those using AM (SSB stations are authorized to use 12 watts, as opposed to 4 watts for AM stations) and to more easily locate other SSB stations. With the FCC authorization of 40 channels, SSB operation shifted to channels 36–40.
South Africa allows use of nine 27 MHz CB frequencies between 27.185 MHz and 27.275 MHz (27 MHz CB channels 19–27). Maximal output power is 5 watts carrier power in AM mode and 12 watts PEP power in SSB mode. As with the 29 MHz allocation, each frequency is assigned to either AM only or SSB operation.
Frequency-domain depiction of the mathematical steps that convert a baseband function into a single-sideband radio signal. Single-sideband has the mathematical form of quadrature amplitude modulation (QAM) in the special case where one of the baseband waveforms is derived from the other, instead of being independent messages:
The originally imported equipment used AM amplitude modulation and SSB single-sideband modulation modes of transmission. The UK channels that were legalised on 2 November 1981 were on two blocks of frequencies: 40 channels on the 27 MHz band and 20 channels on the 934 MHz band, both of which used FM (frequency modulation) and both unique to the UK.
29.300 MHz is a common frequency to find JA hams on. British hams commonly use the 29.400 to 29.500 MHz band for FM as well with 29.400, 29.450, and 29.500 MHz being common. USA hams can be found on FM anywhere above 29.000 MHz, commonly on the above frequencies talking to overseas hams.
Five 2.8 kHz-wide channels are available in the U.S., centered on 5.332, 5.348, 5.368, 5.373, and 5.405 MHz. Since most radios in SSB mode display the (suppressed) carrier frequency, in USB mode the dial frequencies would all need to be set 1.5 kHz lower. Voice operation is generally in upper sideband mode, which is mandatory in the U.S. . The ...
The frequency 5290 kHz is also available but is restricted to Listen Only (for UK beacons) due to other users. SSB (USB), CW and Phase Modulation is permitted with a maximum power limit of 200 W (23 dBW) on a Secondary, non-interference basis. Communications with non-Amateur stations (i.e. UK military cadet stations) is not permitted.
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