Basic Qualification · B-001 Regulations and policies · B-001-024-003
According to Safety Code 6, what frequencies cause us the greatest risk from RF energy?
- A 300 MHz to 3000 MHz
- B Above 1500 MHz
- C 3 MHz to 30 MHz
- D 48 MHz to 300 MHz
Correct answer: D — 48 MHz to 300 MHz. From the official ISED question bank, verified word for word.
Why
Safety Code 6 identifies the 48 MHz to 300 MHz range as the most hazardous because the human body absorbs radio frequency energy most efficiently at these frequencies, creating a resonance effect that heats tissues more than other bands. The full explanation — and one for every question — is in Pro.
Practise this section
The rules: who may operate, what the certificate allows, station identification, third-party traffic, what you may and may not transmit, and how ISED regulates the amateur service.