Advanced Qualification · A-003 Measurements · A-003-005-010
What is the best instrument to use to check the signal quality of a CW or single-sideband phone transmitter?
- A A sidetone monitor
- B A signal tracer and an audio amplifier
- C A field-strength meter
- D An oscilloscope
Correct answer: D — An oscilloscope. From the official ISED question bank, verified word for word.
Why
An oscilloscope displays the radio wave as a moving line on a screen, letting you see the exact shape of the signal to spot distortions or improper filtering that ruin signal quality. The full explanation — and one for every question — is in Pro.
Practise this section
Measurements: meters, oscilloscopes, counters, signal generators, and what a reading actually tells you.