Bandwidth

It is the range of frequencies occupied by a radio signal. A small bandwith can yield a great reception sensitivity and a part of electromagnetic spectrum can be used by more stations at the same time.
Hams try to use modulation modes minimizing the required bandwidth, such as CW and SSB.
What follows is the typical bandwidth for each mode, assuming audio from 300 Hz to 3 kHz, which is standard in phone modes:

    AM     6000  Hz
    FM     6000  Hz (or 12000)
    SSB    2700  Hz
    CW     from 20 to 200 Hz, depending on speed
    RTTY    170  Hz
    Packet  200  Hz (on HF, in V/UHF an FM carrier is used)
    SSTV   1000  Hz (about)
    FAX    1000  Hz (about)
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