Advanced Qualification · A-003 Measurements · A-003-004-011
You want to calibrate your station frequency reference to the WWV signal on your receiver. The resulting beat tone must be:
- A of a frequency as low as possible and with a period as long as possible
- B a combined frequency above both
- C the mathematical mean of both frequencies
- D at the highest audio frequency possible
Correct answer: A — of a frequency as low as possible and with a period as long as possible. From the official ISED question bank, verified word for word.
Why
When your station frequency is nearly identical to the WWV signal, the two waves interfere to create a beat tone. 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.