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Rattlegram Smart Text App For Licensed & Unlicensed Devices!

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Description

As you know we are always looking at things you can do without being a licensed HAM operator. This one is really really interesting and fun!

Rattlegram is pretty cool check out the video to get a better understanding. As radio enthusiast this should prove to be an interesting project for those of you that undertake it!

About Rattlegram

English

Transmit short text messages over COFDMTV encoded audio signals

COFDMTV is based on COFDM (coded orthogonal frequency-division multiplexing) technology:
– 160 ms long OFDM symbols
– 6.25 Hz per sub-carrier
– 1/8 guard interval
– differentially encoded PSK (phase-shift keying) modulation
– systematic polar codes for forward error correction

Currently only Mode 14 is supported:
Using a SPC(2048, 1392) with CRC32C aided SCL decoding and differential QPSK modulation for the payload.
Only a bandwidth of 1600 Hz is needed and the transmission of 170 bytes take about one second with the leading noise and fancy header disabled.

What’s New in the Latest Version 1.4

Last updated on Dec 14, 2022

– show full date
– improved responsiveness of user interface
– made failure messages less confusing
– internal improvements

We tested it as well and it works pretty good… Check Out Our YouTube Page https://youtu.be/2x-IztI3ybo

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