RF PREP // FCC AMATEUR RADIO

E1 · Commission Rules

Amateur Extra · correct answers only, in question-pool order.

E1A01

Why is a 3 kHz-wide USB signal with a displayed carrier of 14.348 MHz not legal?

AnswerIts upper 1 kHz extends beyond the 20-meter band edge.

For USB, transmitted energy lies above the displayed carrier frequency, so the entire occupied bandwidth must fit below the upper band edge.

E1A02

Answer3 kHz above the lower band edge.

LSB energy extends below the displayed carrier, so enough clearance is required to keep the whole emission inside the band.