More magnetic loop experiments

Experimenting is the main thing of this hobby I think. So, my goal this time is to make a usable small portable magnetic loop that is reasonable easy to tune. There are several designs that you can find on the internet and some of them claim to be better then others. I choose the coax version for myself as it is light to carry and can be very small. I discussed some possebilities with PE1BVQ Hans and he gave me the measurements of his own loop that does well. I already had the 3x 500pF varco from him and decided to use it again but in a bigger box. The problem of tuning still is very difficult and Hans told me I should build a reduction. Glad the box is big enough.... I first thought of building another varco myself but let that go eventually. I have the luck to have a colleague that happens to be also studing for mechanical engineer and he always has good ideas. He designed a reduction system with isolation (less handeffect) from scrap and some new parts. The idea is simple but effective, this guy has nothing with my radio hobby but though of the exact good solution within 5 minutes. I think that is incredible! And besides that he helped to realize the mechanical part. We finally build this together and tuning is now a lot easier.

But still I would like to have a indicator besides the indication at the tuning knob. It should be no problem, but that is another experiment. Now, I was thinking of were to really use this antenna in case of emergency. And just when I was thinking this video shows up:

Of course you use it inside a shelter. I would use it in the basement as that is the most safe place in the house when disasters like hurricanes will happen. When my loop is ready I will test it for shure and post a video, at least that is the idea...