Blitzortung shielded ferrite antenne tube end caps
thingiverse
These are end caps designed specifically for aluminium 20mm tubes used in ferrite antennas for the Blitzortung.org lightning flash detection network. The tube's shielded design protects the antenna from the electrical component of longwave lightning flash signals. Older versions of the end cap featured a hole, but the new version boasts a slot that simplifies mounting the cap. The 20mm outer diameter and 18mm inner diameter tubes are used for ferrite antennas with 12mm diameters, including heat shrink tubing. Drill a small hole to attach a tiny tin screw securing a short, thin ground wire cable. Connect this cable to the amplifier's ground terminal. A clamp is included, though it remains untested and unpublished.
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