#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: github.com/SensorsIot/Antenna-Tester
Stuart's Page: loratracker.uk/
and his results: github.com/LoRaTracker/Test-Reports
Watts to dBm converter: rapidtables.com/convert/power/Watt_to_dBm.html / g4urh.co.uk/amateur_radio/watt_converter.php
Radio link budget calculator: en.jirous.com/calculation-wifi
Coax cable loss calculator: qsl.net/co8tw/Coax_Calculator.htm
Ground plane Calculator: csgnetwork.com/antennagpcalc.html
LoRaWAN Balloon experiment: bit.ly/2DgSBUB
Moxon Antenna: moxonantennaproject.com/
Moxon antenna 3D: thingiverse.com/thing:2124434
VSWR to dB table: bit.ly/2IgrWuI
50$ satelite: 50dollarsat.info/page1.html


Supporting Material and Blog Page: sensorsiot.org
Github: github.com/sensorsiot

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