Radials and Hybrid Baluns OZ-Tenna Hybrid UnUns isolate the coax from the UnUn and hence to work properly radials must be used. In the pic above, the 2 radials at the base of the antenna do carry a small amount of current – you have to squint a little – but it is there. Why …
Hybrid UnUn – The OZ-Tenna Advantage What are Hybrid UnUn’s? Marketing hype is something that annoys me at a deep and painful fundamental level. In the past I’ve been the victim of such and it has always left a bad taste in my mouth. The term ‘Hybrid UnUn’ just hints at that, and I have …
The Trail-Tenna – New For April 2022 Owen Duffy in his excellent blog did a critique for a single core fairly low efficiency EFHW transformer. He left clues in the post about how to improve efficiency which I duly followed. It was not hard. I changed the core(s) and windings and used a nanoVNA to …
Modelling And testing At OZ-Tenna In the last week Amateur Radio activities have had to take a back seat to work and family life, but some maybe interesting things have happened. Common Mode Current Measurement Ages ago I made a clip-on ferrite based sensor, added a diode and some caps and a burden resistor to …
We Wind and Test a LOT of Cores The cores we use in our products aren’t just chosen because they look nice or feel good in some way – and we admit those are good qualities but they’re optional. We actually wind a few, test them, put them in a prototype product and evaluate. One …