Your receiver's S-meter is calibrated to a standard of 6 dB per S-unit per a recommendation by the International Amateur Radio Union (IARU). The S-meter shows S9 when receiving a station transmitting with 100 watts. Neglecting propagation changes, what transmitter power would cause your receiver's S-meter to read S8?

Why

Each S-unit on your meter represents a 6 dB change in signal strength, which corresponds to a fourfold change in power. The full explanation — and one for every question — is in Pro.

Practise this section

Operating and procedures is section B-002 of the Basic exam: How to operate: calling, phonetics, Q-signals, repeaters, nets, emergency traffic, and the courtesies that keep a band usable.

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