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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.
CW / SSB / (AM: receive-only) Yes Xiegu 5105 [53] Commercial 160m – 6m 4.5 SSB / AM / FM Yes Xiegu G90 [54] Commercial 160m – 10m 20 CW / SSB / AM / (FM experimental with low sound quality) Yes Elecraft KX3 Kit or assembled 160 – 6 meter ham bands / wide band RX 0.1 – 10 CW / SSB / AM / FM / digital modes Yes Yaesu FT-818, Yaesu FT-817(ND)
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 International Telecommunication Union uses an internationally agreed system for classifying radio frequency signals. Each type of radio emission is classified according to its bandwidth, method of modulation, nature of the modulating signal, and type of information transmitted on the carrier signal.
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.
2,304.1 MHz Region 2 CW & SSB calling frequency [2]; 2,320.2 MHz Region 1 Narrow-band calling frequency [3]; 2.400–2.485 GHz: Spread Spectrum band for general radio-controlled aircraft recreational use (amateur radio license holders have 2.39–2.45 GHz licensed for their general use in the USA) and using both frequency-hopping spread spectrum and direct-sequence spread spectrum RF ...
An example is the stereophonic difference (L-R) information transmitted in stereo FM broadcasting on a 38 kHz subcarrier where a low-power signal at half the 38-kHz carrier frequency is inserted between the monaural signal frequencies (up to 15 kHz) and the bottom of the stereo information sub-carrier (down to 38–15 kHz, i.e. 23 kHz).
As with the 29 MHz allocation, each frequency is assigned to either AM only or SSB operation. Channels 19–22 (27.185–27.225 MHz) are designated for AM use and channels 23–27 (27.255–27.275 MHz) are designated for SSB use.