Basic Qualification · B-001 Regulations and policies · B-001-007-006
When may an amateur radio station transmit an encoded message?
- A Only during contests
- B Only when transmitting above 450 MHz
- C Only when the encoding or cipher is not secret
- D Only during a declared communications emergency
Correct answer: C — Only when the encoding or cipher is not secret. From the official ISED question bank, verified word for word.
Why
An amateur station may send an encoded message only if the method used is open and not kept secret, meaning anyone with the right tools could decode it. 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.