Special Presentations

APRS (Automatic Packet Reporting System) is a real-time digital communication network that lets amateur radio operators share live information such as location, weather, messages, and telemetry over RF and the internet. Originally created in 1982 by Bob Bruninga, WB4APR, APRS has grown into a worldwide system used for everything from vehicle tracking and outdoor adventures to emergency response, marathons, and high-altitude balloon flights. It works through a combination of local RF transmission, digipeaters, and internet gateways (I-Gates) that relay packets globally.

Operators can get on APRS using handhelds with built-in APRS, mobile radios with TNCs, software-defined radios, phone apps like APRSdroid, or desktop software. APRS supports messaging, weather reporting, satellite/ISS digipeating, and even modern integrations like Meshtastic and sensor networks. While APRS offers incredible situational awareness and flexibility, users must understand its limitations—simplex congestion, no guaranteed delivery, and the need for good operating practices. Overall, APRS remains a powerful, resilient,…

Please see the attached presentation from W4MC during the HVARC October regular meeting.

This presentation gives amateur radio operators an inside look at how public safety agencies communicate in today’s world. Starting with the basics of repeaters and conventional systems, it builds toward an understanding of trunking, digital voice, and modern P25 Phase I and Phase II systems. Using clear visuals and local examples, the talk explains why conventional repeaters aren’t enough for large-scale operations, how trunking maximizes efficiency, and how Phase II technology doubles system capacity.

The goal is to make complex technology simple, highlight why it matters for first responders, and spark discussion about where amateur radio fits into the bigger picture of emergency communications.

Summary:

The document discusses the limitations of traditional repeaters in public safety communications and explores the advantages of trunked radio systems for enhancing reliability and capacity in emergency services.

Attached to this post are a PDF copy of the presentation, and a video version of the presentation for those interested in hearing the questions & answers throughout the in-person event.

With any digital related questions, please reach out to myself or PJ.

N1ENC@tjx400.com

KO4RMV@gmail.com

Thanks!!