Digital Mode Without Cables or Modems: Rattlegram (OFDM) (Patreon)

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What a fantastic idea! The Rattlegram app for Smartphones transmits data using our radios' microphones and loudspeakers. With more than double the speed of APRS. How is this possible without cables to the handheld? And what is the relation of this project with Wi-Fi, 4G, and 5G? Stay with me. I will tell you an interesting story. Links: OFDM Modem: https://github.com/aicodix/modem Zero Retries Newsletter: https://zeroretries.substack.com/ Baofeng UV-5R (not allowed in EU and CH): https://amzn.to/3W0P2KU Ailunce HD1 DMR radio (used in this video): https://amzn.to/3Pf4Szo Anytone AT-D878 (better choice, but currently not allowed in CH): https://amzn.to/3UR4eJI or https://s.click.aliexpress.com/e/_Dci9tXl The links above usually are affiliate links that support the channel (no additional cost for you). Github: https://www.github.com/sensorsiot My Patreon Page: https://www.patreon.com/AndreasSpiess If you want to support the channel, please use the links below to start your shopping. No additional charges for you, but I get a commission (of your purchases in the next 24 hours) My Amazon.com shop: https://www.amazon.com/shop/andreasspiess For Banggood https://bit.ly/2jAQEf4 For AliExpress: http://bit.ly/2B0yTLL For Amazon.de: http://amzn.to/2r0ZCYI For Amazon UK: http://amzn.to/2mxBaJf For ebay.com: http://ebay.to/2DuYXBp https://twitter.com/spiessa As an Amazon Associate, I earn from qualifying purchases