One of the very popular topics on ham social media is common mode current, and it seems whilst opinions are presented as fact, there is little sound science in evidence. In a two wire transmission line, we can get good insight into the state of current balance by measuring three currents at a point along … Continue reading The black art of common mode current and two wire transmission lines
Logging temperature meter (ltm) is a ESP8266 based temperature measurement and logging device. Above is the prototype. Last update: 3rd May, 2021, 1:18 PM
Logging temperature meter (ltm) is a ESP8266 based temperature measurement and logging device. ESP32 The project is based on port of an existing ESP8266 Arduino project, and consideration was given to migration to the ESP32 hardware platform, but there are large differences to the WiFi related libraries… so for now, ESP8266 looks ok. A bigger … Continue reading Logging temperature meter (ltm) v1 – prototype Vin calibration
Logging temperature meter (ltm) is a ESP8266 based temperature measurement and logging device. The project is based on port of an existing ESP8266 Arduino project, and consideration was given to migration to the ESP32 hardware platform, but there are large differences to the WiFi related libraries… so for now, ESP8266 looks ok. There remain development … Continue reading Logging temperature meter (ltm) v1 – a preview
At Chinese AD8307 power measurement module #2 I concluded that the modified AD8307 was useful on HF, and through to 54MHz depending on accuracy requirements. This article looks at combining the AD8307 module with a display option based on an Arduino Nano. Above is a demonstration of the display prototype. The module in the foreground … Continue reading Chinese AD8307 power measurement module #3