Practical takeaway
Radio direction finding, hidden transmitter hunts, contests, grid locators, IRLP, EchoLink, and VoIP.
T8C · 11 pool questions
Direction Finding, Contests & Internet Linking
Radio direction finding, hidden transmitter hunts, contests, grid locators, IRLP, EchoLink, and VoIP.
Technician exam focus
This group contains 11 questions in the current pool. The teaching below keeps the important tested terms visible while explaining what they mean in normal Amateur Radio use.
1. Direction finding turns signal strength into a bearing
Radio direction finding (RDF) is used to locate interference, jammers, or hidden transmitters. A directional antenna is especially useful in a transmitter hunt because its response changes as you point it toward or away from the signal.
2. Contests exchange concise information
Amateur contests are operating events where stations make contacts under a defined set of rules and exchange required information. Different contests use different exchanges, so read the sponsor’s rules rather than assuming every contest wants the same report.
3. Grid locators describe location compactly
A Maidenhead grid locator is a compact way to describe geographic location and is commonly exchanged in VHF/UHF, satellite, and weak-signal operating.
4. Radio can be linked through the internet
VoIP carries voice using internet protocol. Systems such as IRLP and EchoLink connect amateur-radio nodes over the internet. IRLP nodes are commonly controlled over the air with DTMF. Before using EchoLink, an amateur normally registers a call sign and provides proof of license.
T8C checklist
- RDF can locate interference or a hidden transmitter.
- A directional antenna is useful for transmitter hunting.
- A grid locator communicates geographic location compactly.
- VoIP carries voice via internet protocol.
- IRLP control commonly uses DTMF.
- EchoLink requires call-sign registration and proof of license.
Exam scope: NCVEC 2026–2030 Technician Class (Element 2), effective July 1, 2026 through June 30, 2030, with February 19, 2026 errata. The current NCVEC pool is the exam authority; explanatory prose here is SPARKA teaching material. NCVEC pool