In Australia and New Zealand, our parks exchange is a little different to what’s been published online for other parts of the world, so if you’re just starting out chasing or activating with CW, here’s the commonly used script.

Following on from the previous exploration of how receivers convert a CW signal into an audable tone, we will take the next step in our journey to understand why pre-DSP receivers have a fixed pitch CW tone, and the oft overlooked feature there to ease your ears.

Needing a paired 49:1 transformer and a common mode choke (CMC) for a permanently installed EFHW, I whipped one of each up and mounted them in some 50 mm PVC pipe.

Small, high performing and cheap, what’s not to love about bifilar wound common mode chokes (CMC). This article will walk through the process of building one (or two).

Does your amateur radio station comply with EMR safety guidelines? The WIA and RSGB tools enable you to quickly evaluate, mitigate and document your compliance. I expect that in most instances, it would take less than 10 minutes to complete. It really is as easy as a, b, c.

TinyGS is a great project with a very simple installation. The documentation however is several years out of date, so prepare the pull your hair out. After installing it twice with a six month interlude, I forgot what I needed to do, so am documenting it here for future me.

There is plenty of published information on how to build common mode chokes (CMCs), but not much related to measuring their performance. This post details three such tests using a Nano VNA. If anyone is aware of additional tests which will shed light on a CMC’s performance, I’m all ears.