Question
How do APRS stations relay data?
Answer Options
- A) By packet ACK/NAK relay
- B) By C4FM repeaters
- C) By DMR repeaters
- D) By packet digipeaters
Correct Answer: D
Explanation
APRS (Automatic Packet Reporting System) is designed as a tactical broadcast system, where data (like location) must be widely distributed for mapping and display. Since the core APRS protocol uses unacknowledged broadcast packets, it relies on designated intermediate relay stations to extend the coverage area.
APRS stations relay data primarily by packet digipeaters (Digital Repeaters). These stations listen for a packet containing a relay path instruction (like WIDE) and, if appropriate, retransmit the packet to extend its range and reach other parts of the network, including gateways to the internet backbone.
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