Watching HF band activities using Grafana

The best tool around for watching and analyzing band activites is wspr.live. It allows ham radio operators to watch all WSPR activities in their local grid ...

High IO-Wait and lags under Linux after wiping SSD

I was experiencing high IO-Wait after moving a PC from Windows to Linux. According the buffered reads the SATA interface wasn’t the bottleneck. # hdparm -t...

Building an efficient End-Fed Half Wave transformer using special Ferrite 2643625002 from Fair-Rite

A few months ago I was reading an article written by Owen Duffy that a compact, low-loss QRP-capable EFHW (1:49) transformer could be build using the Fair-R...

Useful, affordable tools for daily embedded development tasks

This is a more or less incomplete list of useful tools which are helping with the daily business of developing embedded stuff. FTDI FT2232HL Can be easily ...

Minimal ESP-IDF Modbus TCP example

As the ESP-IDF Modbus TCP is rather complex I decided to strip it down to a bare minimum. This implemention is based on ESP-IDF v4.4.1. It increases an uin...