Lab assessment of impedance mismatch of a UHF/SMA adapter-block

Since I’ve purchased Mini VNA Tiny, my first ever VNA analyzer, I have completely reconsidered all my beliefs around how cables, connectors and how impedance mismatches in general behave around the circuits. The situation, I noticed, is not as ‘innocent’ as it seems. Most recently, amongst many other cables, I have been measuring the loss of a very high quality Hyperflex-10 cable by Messi-Paolini. This is currently the lowest loss…

1:1 50 Ohm Voltage Balun for HF bands

Here’s my small project of an easy to make 1:1 HF Voltage Balun. I have installed this balun between the input of my HF fan dipoles and the RG213 coaxial cable going down to the transceiver. Below there are photos that show how I’ve constructed this voltage balun. Note that this is not a current balun. The balun presented here has also a DC isolation protection between the input and…