Revised version of the HF Antenna isolator
Following the publication of my recent article on loop counterpoises for low noise vertical antennas in the RSGB RadCom magazine, I've had a lot of feedback from RSGB members trying the design.
One question that came up a few times was could it be used with the non-resonant HF verticals such as the popular 43 foot vertical?
To work with those antennas the HF Antenna Isolator would need a 200 ohm output so I've re-designed it to have both 50 and 200 ohm outputs along with the 1 M ohm resistor and 20 kA gas discharge tube to provide protection from static electricity on the antenna.
It's now available.
The web page is: