#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: https://github.com/SensorsIot/Antenna-Tester Stuart's Page: http://www.loratracker.uk/ and his results: https://github.com/LoRaTracker/Test-Reports Watts to dBm converter: https://www.rapidtables.com/convert/power/Watt_to_dBm.html / http://www.g4urh.co.uk/amateur_radio/watt_converter.php Radio link budget calculator: http://en.jirous.com/calculation-wifi Coax cable loss calculator: http://www.qsl.net/co8tw/Coax_Calculator.htm Ground plane Calculator: http://www.csgnetwork.com/antennagpcalc.html LoRaWAN Balloon experiment: http://bit.ly/2DgSBUB Moxon Antenna: http://www.moxonantennaproject.com/ Moxon antenna 3D: https://www.thingiverse.com/thing:2124434 VSWR to dB table: http://bit.ly/2IgrWuI 50$ satelite: http://www.50dollarsat.info/page1.html Supporting Material and Blog Page: http://www.sensorsiot.org 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 the next 24 hours) to buy new stuff for the channel For Banggood https://bit.ly/2jAQEf4 For AliExpress: http://bit.ly/2B0yTLL For ebay.com: http://ebay.to/2DuYXBp https://www.facebook.com/profile.php?id=100013947273409 https://twitter.com/spiessa https://www.instructables.com/member/Andreas%20Spiess/ Please do not try to Email me or invite me on LinkedIn. These communication channels are reserved for my primary job Equipment in my lab: http://www.sensorsiot.org/my-lab/