Advanced Qualification · A-003 Measurements · A-003-005-011
What is the best signal source to connect to the vertical input of an oscilloscope for checking the quality of a transmitted signal?
- AThe RF output of the transmitter through a sampling device
- BThe RF signals of a nearby receiving antenna
- CThe IF output of a monitoring receiver
- DThe audio input of the transmitter
Correct answer: A — The RF output of the transmitter through a sampling device. From the official ISED question bank, verified word for word.
Why
To see the true shape and quality of your transmitted radio wave, you must connect the oscilloscope directly to the transmitter's radio frequency output using a sampling device. The full explanation — and one for every question — is in Pro.
Practise this section
Measurements is section A-003 of the Advanced exam: Measurements: meters, oscilloscopes, counters, signal generators, and what a reading actually tells you.
Drill A-003 — free, no account