[Ribbit-Users] http gateway and digipeater with Rattlegram and linux modem

[Ricardo Saiz]

 Hello,
Not much activity in this list recently. Since my previous email I have installed and successfully run the linux modem https://github.com/aicodix/modem/ in a Raspberry version 1. I have left it up and working for several days. The script records sound clips from a 2 meter radio, demodulates the data, shows the message in an http server:
http://ea4gmz.hopto.org/OFDM.txtand repeats the same message a few seconds later. Fellow hams around Madrid have been able to exchange messages using Rattlegram in their smartphones and a fixed or handheld radio. It works through voice repeaters too. The modem software was modified for making the algorithm faster, maybe at the expense of some sensitivity. I have not noticed a significant loss of sensitivity, and now it takes less than 100 ms to process an audio clip and decode the message, even in a Rpi 1.

This is a temporary and experimental system. I wish to engage more people into Rattlegram as an introduction to Ribbit.





    En miércoles, 7 de febrero de 2024, 23:25:23 CET, Ricardo Saiz <rsaizv at yahoo.es> escribió:  
 
 HelloI have played a bit with the linux software https://github.com/aicodix/modem/ and the Android app. I wrote my experiencies in my blog, currently in spanish only:https://www.radiotecnia.es/rattlegram-experimentos-con-ofdm/https://www.radiotecnia.es/digi-repetidor-rattlegram/I modified YD1RUH's script for adding more information to the message log and also for repeating the received messages, so my station can act as a digipeater. This is a simple and very basic way of implementing some features that are announced for Ribbit. Looking forward to trying that app when it becomes available.
regards
  
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