Single-sideband (SSB) modulation is a refinement of
amplitude modulation (AM) that more efficiently uses
electrical power and
bandwidth. It is closely related to vestigial sideband
modulation (VSB)
Amplitude modulation produces a modulated output signal that
has twice the bandwidth of the original
baseband signal. Single-sideband modulation avoids this
bandwidth doubling, and the power wasted on a carrier, at the
cost of somewhat increased device complexity
High frequency (HF)
radio frequencies are between 3 and 30
MHz. Also known as the decameter band or decameter wave
as the wavelengths range from one to ten
decameters (ten to one hundred meters). Frequencies immediately
below HF are denoted Medium-frequency (MF), and the next higher frequencies are known as
Very high frequency (VHF).
Shortwave (2.310 - 25.820 MHz) overlaps and is slightly lower than
HF.
