#188 Antenna Tutorial incl. cheap DIY Antenna Tester (LoRa, ESP32)

Everything goes wireless these days. This is why we have a close look at the “black magic” of antennas, how they work, what is essential, and how to test them.
Based on this knowledge we will build a cheap antenna tester for LoRa antennas. A similar device can be built to test Wi-Fi antennas.
It uses an ESP32 TTGO board on one side and a Wemos D1 mini with a Hope RFM95 module on the other side.
Links:
Sketches:
Stuart's Page: /
and his results:
Watts to dBm converter: /
Radio link budget calculator:
Coax cable loss calculator:
Ground plane Calculator:
LoRaWAN Balloon experiment:
Moxon Antenna: /
Moxon antenna 3D:
VSWR to dB table:
50$ satelite:
Supporting Material and Blog Page:
Github:
My Patreon Page:
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