Automatic Packet Reporting System is a digital communications protocol that can exchanges information among large number of stations both local and global.
Connect directly with the global APRS-IS network by Internet. Messages reaching the gateways will be relayed to the APRS-IS feed.
PulseModem A can work without Internet, by connecting the audio port to your amateur radio.
You as a licensed Amateur Radio operators can send and receive APRS location and message.
You can connect directly with the global APRS-IS network by Internet. Messages reaching the gateways will be relayed to the APRS-IS feed.
APRS messages are short in length, in less than 100 bytes.
Messages are encoded in AX.25 protocol with Bell 202 AFSK modulation.
PulseModem A will play the encoded message through the audio port of your iOS device, to your radio.
The PulseModem A connects to the server, which you can change in settings, by TCP protocol.
The APRS network is intended for licensed amateur radio holders.
A callsign SSID identify your device, which is your ham radio callsign followed by a dash and then a number from 0 to 15 inclusive.
PulseModem A has built-in signal scope.
The RF output of your radio can be displayed nicely in the signal scope for optimal decoding.
It works equally well on both iPhone and iPad.