Basic Qualification · B-003 Station assembly, practice and safety · B-003-011-011
The difference between DC input power and RF output power of a transmitter RF amplifier:
- A radiates from the antenna
- B appears as heat
- C is lost in the transmission line
- D is due to oscillations
Correct answer: B — appears as heat. From the official ISED question bank, verified word for word.
Why
When a transmitter amplifier takes in direct current power but cannot turn all of it into radio waves, the leftover energy must go somewhere. The full explanation — and one for every question — is in Pro.
Practise this section
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.