Advanced Qualification · A-007 Feedlines and matching · A-007-006-007
If the overall gain of an amateur station is increased by 3 dB the ERP (Effective Radiated Power) will:
- A double
- B decrease by 3 watts
- C remain the same
- D be cut in half
Correct answer: A — double. From the official ISED question bank, verified word for word.
Why
A 3 dB increase in gain means the signal power has doubled because the decibel scale is logarithmic, where every 3 dB step represents a multiplication of power by two. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.