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Failure of the BFO to match the original carrier frequency when receiving such a signal will cause a heterodyne. Suppressed carriers are often used for single sideband (SSB) transmissions, such as for amateur radio on shortwave. That system is referred to in full as SSB suppressed carrier or (SSB-SC).
The 27 MHz CB27/81 Bandplan is a list of the channel frequencies for FM CB radio in the United Kingdom. Unlike CB usage in the United States , and subsequently elsewhere in the world, the original UK 40 channels progress in order with 10 kHz spacing.
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]
Illustration of the spectrum of AM and SSB signals. The lower side band (LSB) spectrum is inverted compared to the baseband. As an example, a 2 kHz audio baseband signal modulated onto a 5 MHz carrier will produce a frequency of 5.002 MHz if upper side band (USB) is used or 4.998 MHz if LSB is used.
Indonesia also permits usage of the standardized 26.965–27.405 MHz HF CB band with AM/SSB modes allowed. The new frequency allocations (142 & 476 MHz) were regulated in a decision by the Director General of Posts and Telecommunications in decree Number 92 Year 1994 on Implementing Regulation of the Inter-Citizens Radio Communications. [8]
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Citizens band radio (CB radio) is a land mobile radio system, a system allowing short-distance one-to-many bidirectional voice communication among individuals, using two-way radios operating near 27 MHz (or the 11-m wavelength) in the high frequency or shortwave band.