APRS

APRS
APRS
Automatic
Packet
Reporting
System
APRS
●
Developed by Bob Bruninga WB4APR
●
Development started in the 1980s.
●
Uses the frequency 144.390 MHz in the USA
●
It is a form of packet radio.
●
Packets are carried over both RF and internet
paths.
Definitions – APRS-IS
●
●
●
APRS-Internet Service
Internet servers that collect and store APRS
packets
Most well-known user interface is aprs.fi
website
Definitions - Digipeater
Definitions - iGate
APRS-IS
My Original APRS Solution
GPS
PIC
APRS with a Smartphone
Adapter
...or just this
What You Need
●
Android smartphone (with or without data plan)
●
APRSDroid software
●
2m FM transceiver with VOX capability
●
Adapter cable
●
(Optional) external antenna
...or just this
●
●
Android smartphone with data plan or other
data access
APRSDroid software
What's the Difference?
APRS-IS
APRS-IS
Baofeng UV-3R / UV-200
●
2m / 70cm FM handheld
●
Inexpensive on eBay
●
Has VOX support
●
2W output
●
●
Single 3.5mm 4-pole
connector for signal
Takes 5V power on
barrel connector
Android Smartphone
●
●
●
●
Required: Android 1.5 or
later
Recommended: Android
2.0 or later
Connector: Single 3.5mm
4-pole connector
Microphone: High
impedance required
(around 1kΩ to 1.5kΩ or
greater)
Adapter Cable
●
Matches phone pinout to radio pinout
●
Attenuates audio in both directions
●
Sets correct impedance
●
(Optionally) isolates grounds with transformers
Pinouts
Speaker
Left Speaker
Microphone
PTT
Ground
Right Speaker
Ground
Microphone
UV-3R
Smartphone
My Adapter Attempt
2.2kΩ
Left Audio
Mic
22Ω
Phone
Side
Radio
Side
22Ω
Speaker
Mic
2.2kΩ
My Adapter Attempt
Easy Digi Adapter
APRSDroid
●
●
Available for $5 in the Google Play store
(includes automatic updates)
Available for free at aprsdroid.org
(requires a security compromise)
●
Has AFSK mode (speaker/microphone)
●
Has APRS-IS mode
●
Has other modes (Bluetooth TNC, etc.)
●
Versions available with Google Maps and
OpenStreetMap support
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