In this video, I present a data logger for low-frequency magnetic fields and share the story behind its creation. The device is intended to investigate mysterious disturbances affecting GPS and a proton magnetometer during surveys around Pic de Bugarach in France.
Disclaimer: I enjoy science fiction and often reflect on how little we truly know about where we come from or where we’re headed. However, I always strive to keep at least one foot firmly planted on the solid ground of logic, physics, and modern technology.
00:10 Introduction
00:43 The Magnetometer
01:10 Field Measurements
01:52 GPS Data
02:09 Anomalies at the Site
02:49 Erratic GPS Data
03:10 Correlation Between GPS and Magnetometer Data
03:35 Proton Magnetometer Sensors
04:27 Introducing the Data Logger
05:04 Power Consumption
05:53 Fake Battery Warning
06:07 Data Analysis
06:38 Next Steps
2 Comments
Fake 18650's are really common. A theory is that people take second hand cells, relabel them and sell them online. The largest 18650 currently manufactured is around 3500mAh, but only specific factories make those and they cost quite a bit each (>$15 last I checked). Most cheaper battery factories can only do around 2000mAh-2500mAh.
"GPS accuracy": how is this calculated? Is it something you're calculating yourself or is it a raw number provided straight from the phone (its own internal estimation algorithms)?
Circuit @ 4:50 : what are those filter stages? I think the second two might be band passes, but the first one eludes me.
Really enjoyed your video, your sense of humour is great, your coils & equipment looks really nice and I am jealous you found an excuse to go for an adventure. I suspect that graphing and editing this all together took a lot of time.
Could it be intermittent partial discharge or arcing on the electric lines? Any interference would have to be very broadband to affect both devices.