APRS radio

I’ve been experimenting with APRS (Automatic Packet Reporting System) on HAM Radio. Interesting stuff! Essentially, it is a system that provides situational awareness and context for radio-enabled devices by capturing “beacons” from devices such as mobile radios, fixed point radios, weather stations, satellites, antennas, and creating a data stream that’s used to create a geo-enabled map of devices in real time…an organic “Internet of Things” (IoT) joined in the radio spectrum. As Bob Bruninga, the father of APRS says:

“Since the primary objective is consistent exchange of information between everyone, APRS established standard formats not only for the transmission of POSITION, STATUS, MESSAGES, and QUERIES, it also establishes guidelines for display so that users of different systems will still see the same consistent information displayed in a consistent manner (independent of the particular display or maping system in use)”

There are gateways to the traditional Internet for email, but the value of APRS is in the dynamic resource map it populates to RF contacts in the local area (and through data added to the APRS-IS, the Internet system, and thus generally available), and its ability to send messages between participants. It’s a peer-to-peer network that can grow organically with the addition of “digipeaters” to relay traffic, but still provides station to station information. As the APRS Wikipedia article states, “Anyone may place any object or information on his or her map, and it is distributed to all maps of all users in the local RF network or monitoring the area via the Internet.”

It does depend on access to a digipeater, and one thing I’ve found in a couple days of testing is that my HT 5w Kenwood TH-D72 transmits to the nearest repeater from Emerald Isle with sketchy regularity. It’s 10 air miles, and the standard antenna on the TH-D72 is reliably receives APRS packets from KD4KTO-4, but seems to get them there irregularly. Next week, I’ll be back in the Chapel Hill area, and it will be interesting to see how things fare there. I’ve ordered a better antenna for the radio as well, and that should help considerably with transmit range.


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