Here is a short list of the bandwidth requirement for some common modes when using your amateur radio. Bandwidth is the width of your signal compared against the band. When you're sending any signal, it uses more than just the dialed frequency, so you need to know exactly which frequencies you're using.
AM: 6 kHz
SSB, RTTY, PSK31, AMTOR, PACTOR : 2 -3 kHz
FM, Packet: 5 -15 MHz
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