Basic Qualification · B-003 Station assembly, practice and safety · B-003-010-006
A superheterodyne receiver has an intermediate frequency (IF) of 455 kHz. The local oscillator runs above the operating frequency. To which frequency should it be tuned to receive a signal on 3.54 MHz?
- A3.995 MHz
- B4.450 MHz
- C4.905 MHz
- D13.540 MHz
Correct answer: A — 3.995 MHz. From the official ISED question bank, verified word for word.
Why
To receive a signal at 3.54 MHz when the local oscillator runs above the incoming frequency, you simply add the intermediate frequency of 455 kHz to the signal frequency. The full explanation — and one for every question — is in Pro.
Practise this section
Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.
Drill B-003 — free, no account