Amateur radio, RF design, electronics, uC, software, hacks, technology
My old vertical tuner can’t withstand QRO power levels as the tuner is limited to approx 150W. I am therefore working on a new multiband vertical for QRO operation. Its best to try to be finished before winter sets in(soon approaching as I write this blog post). Instead of using traps, I will tune the [...]
Posted: September 15th, 2012 under Amateur radio, Antennas.
Tags: 4NEC, design, hf, measurements, multiband, NEC, numerical electromagnetic code, proper length, shortwave, simulation, Vertical antenna, VNA
After reading the nice publication by GM3SEK (http://www.ifwtech.co.uk/g3sek/in-prac/inpr1005_ext_v2.pdf) about the Fair Rite ferrite matrial that gives a high resistive component when used for RF choking applications I wanted to do some measurements myself vith my VNA on that material used as a RF choke. Above is a three choke setup The blue trace above is [...]