Frequently Asked Questions
The most-asked questions about packet radio and radio hobbies.
What exactly is packet radio?
Packet radio is a method of sending digital data in small, discrete blocks (packets) over amateur radio frequencies rather than over wired networks. It lets two or more stations exchange text, telemetry, or position data using store-and-forward nodes or direct point-to-point links, all within the licensed amateur bands.
Who are the most important pioneers in packet radio history?
Bob Hart (W1BH) is widely credited with designing the AX.25 link-layer protocol that became the backbone of amateur packet radio in the early 1980s, while Bob White (KB9CCH) introduced APRS in 1983, turning the technology into a real-time tracking and messaging system. Paul Lin (W6LPS) and a small group of West Coast hams conducted some of the earliest experimental packet links that inspired the broader effort.
What is APRS and why does it get so much attention?
APRS (Automatic Packet Reporting System) is the most recognizable packet-radio application, broadcasting a station's GPS position, weather readings, or short text messages on an open channel so any nearby receiver can see them. It became a cultural touchstone for the hobby because it combined radio, computers, and mapping into a single, visually compelling activity.
What is a TNC and is one still necessary today?
A TNC (Terminal Node Controller) is a dedicated digital modem that converts the audio tones carrying your data into digital packets and back, handling the AX.25 framing and error correction. Modern sound-card modems in a laptop or a LoRa transceiver with built-in digital handling have largely replaced the standalone TNC box for most operators.
What do I actually need to get started with packet radio?
At minimum you need a licensed amateur radio operator's ticket, a VHF or UHF transceiver (or a handheld on 2 m), a sound-card modem or a digital-capable radio, and a computer or phone running a packet client such as Winlink, CHIRP, or a LoRa terminal app. Joining a local ham club is the fastest way to get hands-on help with frequency coordination and antenna setup.
Which frequencies and channels are commonly used?
In the United States the traditional packet and APRS channels are 144.150 MHz on 2 m and 433.150 MHz on 70 cm, though many local groups also use 145.050 MHz or other sub-bands. Other countries allocate different frequencies, so always check your national amateur-radio allocation before transmitting.
How does packet radio relate to LoRa and LoRaWAN?
LoRa is a newer, ultra-low-power spread-spectrum radio technology that many hams now use to send the same kind of short digital messages and position reports that classic AX.25 packet radio handled. LoRaWAN adds a star-topology network layer, but the underlying hobby goal—reliable, low-data-rate wireless messaging without the internet—remains the same.
What are some landmark moments in the packet-radio story?
The mid-1980s saw the first store-and-forward BBS nodes and the rapid spread of APRS across North America, while the early 1990s brought the first experimental links connecting amateur packet stations directly to the Internet. The 2000s and 2010s brought smartphone APRS apps and the rise of LoRa, effectively giving the hobby a second digital renaissance.
Why do emergency-services groups value packet radio?
During natural disasters or infrastructure outages, packet radio and APRS provide a simple, low-bandwidth way to relay positions, status reports, and short messages when cell towers and internet backbones are down. Organizations like ARES and RACES train volunteers specifically in these digital modes because they require very little spectrum and can be operated from a handheld.
Where can a newcomer find an active community and ongoing projects?
The ARRL and national amateur-radio societies host local clubs that regularly run packet and LoRa sessions, while online spaces such as the APRS-IS network, LoRa community forums, and dedicated Discord or IRC channels let you watch live traffic and ask questions in real time. Attending a local club's first Saturday meeting is usually the quickest path to a mentor and a working demo.