How close to the upper edge of a band’s phone segment should your displayed carrier frequency be when using 3 kHz wide USB?
At least 3 kHz above the edge of the band
At least 3 kHz below the edge of the band✓Правильный ответ
At least 1 kHz above the edge of the segment
At least 1 kHz below the edge of the segment
Объяснение
With USB the occupied spectrum lies entirely above the displayed carrier frequency, so a 3 kHz wide signal needs its displayed frequency at least 3 kHz below the upper edge to stay inside. Placing that margin above the edge points it in the wrong direction and would put the whole emission outside the segment.