BasicB-001-016-007
In which of the following amateur radio bands is single sideband prohibited?
D
Answer
Regulations and administration
Type
A
24.890 MHz to 24.990 MHz
B
18.068 MHz to 18.168 MHz
C
7.000 MHz to 7.300 MHz
D
10.100 MHz to 10.150 MHz
Answer Notes
The 30-meter band (10.100 to 10.150 MHz) is allocated to amateurs on a secondary basis, meaning amateur operators must avoid causing interference to primary users. To facilitate this sharing, regulatory authorities place strict bandwidth limits on this frequency range.
Because of these tight bandwidth restrictions (typically limited to 1 kHz), voice modes such as Single Sideband (SSB), which require about 3 kHz of bandwidth, are strictly prohibited. Operations on this band are restricted to narrow-band modes like Continuous Wave (CW) and digital data.
The other options listed (12m, 17m, and 40m) all have sub-bands that permit phone emissions, making them perfectly legal for SSB operations.
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Which of the following amateur radio bands has a maximum allowed bandwidth of less than 6 kHz?
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What precaution must an amateur radio operator take when transmitting near band edges?