Deep Dive: T4B09
The correct answer is C: By entering the group's identification code. On a digital voice transceiver (like DMR, D-STAR, or System Fusion), you select a specific group of stations by entering the group's identification code (talkgroup ID, reflectors, etc.). Each group has a unique ID number that you program or select. Digital voice systems organize communications into groups (talkgroups in DMR, reflectors in D-STAR, etc.). Each group has a unique identification code. When you want to communicate with a specific group, you enter or select that group's ID code. Your transmissions are then routed to that group, and you receive transmissions from that group. This is how digital voice systems organize and separate different conversations and user groups.
Why Other Answers Are Wrong
Option A: Incorrect. While frequencies might be stored in memory, group selection is about the group ID, not just the frequency. Digital systems use both frequency and group ID. Option B: Incorrect. CTCSS tones are for analog repeaters, not for selecting digital voice groups. Digital systems use group ID codes. Option D: Incorrect. Automatic identification is a feature that identifies your station, but it doesn't select which group you're communicating with.
Exam Tip
Select digital group = Enter group ID. Remember: On digital voice transceivers, you select a specific group by entering the group's identification code (talkgroup ID, etc.).
Memory Aid
**S**elect **D**igital **G**roup = **E**nter **G**roup **I**D (think 'SDG = EGI')
Real-World Example
You're using a DMR radio and want to communicate on talkgroup 3100 (a regional talkgroup). You program talkgroup 3100 into your radio's code plug and select it. When you transmit, your signal is routed to talkgroup 3100, and other operators monitoring that talkgroup hear you. The group ID (3100) determines which group of stations you're communicating with.
Source & Coverage
Question Pool: 2022-2026 Question Pool
Subelement: T4B
Reference: FCC Part 97.205
Key Concepts
Verified Content
Question from the official FCC Technician Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the T4B topic.