A simple transformer model of the Guanella 1:4 balun – some further observations.Garden environmental telemetry project – part 4.Modelling an antenna as a simple two terminal resistance is often naive.An improved simple Simsmith model for exploration of a common EFHW transformer designs (v1.03).Another small efficient matching transformer for an EFHW – LO1238 – VK3PY, VK3TU build and measurement.Another small efficient matching transformer for an EFHW – 2 x 5943000601 (FT82-43) – VK4JJ build and measurement.Another small efficient matching transformer for an EFHW – 2643251002 – #5 – improved Simsmith model (v1.03).Garden environmental telemetry project – part 5.Review of inexpensive Chinese thermostat – DST1000.Comparing RF Power Amplifier Tube Performance Computer and Calculate initial load line of valve RF amplifier on the AL811H.(tr)uSDX unauthorised product and countermeasures.tinyPFA – a set of Allan Deviation plots.tinyPFA – Trimble Thunderbolt GPSDO vs Leo Bodnar Precision GPSDO.tinyPFA – HP8656B vs Trimble Thunderbolt GPSDO.BG7TBL FA-3-6G frequency meter – initial impressions.nanoVNA-H – can firmware be updated if it has a broken USB socket?.Refurbishing aluminium antenna parts affected by weather / corrosion.

Can a diode be used to rectify signals smaller than its ‘threshold’ voltage?.Pulse test of a Hantek 6204BD 4 channel 200MHz USB DSO and supplied probe.Re-engine of Deutscher 650 chipper shredder.

Nanovna v3