Where two-way amateur radio communication is authorized on 60m, it has generally been within the frequency range 5250–5450 kHz, but the whole of this range is not necessarily available and allocations vary significantly from country-to-country.
In a number of countries the allocation is channelized at present, whereas others have block or band allocations. Voice operation is generally in upper sideband (USB) mode to facilitate inter-communication by non-amateur service users if necessary. In the United States and its Dependencies it is mandatory. Where channelization is used, the USB voice 'dial' frequency is normally 1.5 kHz below the quoted channel frequency (e.g. 5403.5 kHz is the USB voice 'dial' frequency for the channel 5405 kHz).
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