What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?
7.178 MHz to 7.181 MHz
7.178 MHz to 7.184 MHz
7.175 MHz to 7.178 MHz✓Ճիշտ պատասխան
7.1765 MHz to 7.1795 MHz
Բացատրություն
LSB places transmitted energy below the suppressed carrier frequency, so a 3 kHz wide signal with the display reading 7.178 MHz occupies from 7.178 minus 0.003, which is 7.175 MHz, up to 7.178 MHz. Nothing is transmitted above the displayed frequency.