LoRa APRS 433 MHz battery powered beacon

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It has a WiFi Access Point for easy real time configuration. It sends: ham callsign, GPS or fixed coordinates, altitude, Volts and mA

Guido

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The original rubber antenna must be tuned!
12/23/2021 at 10:36 • 0 comments

Hi all!
I've found that the original antenna of the LILYGO® TTGO T-Beam is tuned at around 470MHz and that at 433.750 MHz the return loss is -3dB (half power in transmission is lost).
See how I solved in the "Details".
Guido