Summary

Ham radio antenna accessory to protect a ferrite wideband tranformer or isolator. Large enough for 70 mm OD by 40 mm high wire windings. Includes provisions for hanging eyelet, connection bolts and SO239 coax connector.

Instructions

Eyelet and screw clearances are sized for 10-24 or 3/16" hardware. M4 will also fit. Top eyelet hole is intended only for hanging the case from a rope support, so that hole includes a drain at the bottom, for ice protection.
Two notches are placed for the wires to come out to the side eyelets or connection screws. Coaxial rf input is on the bottom and the boss and holes are sized for SO-239 female connector. 2 holes are blind for #4 self-tapping screw. Upper 2 holes clear 4-40 stainless steel screws that are 5/8" or 16mm long. This gives ground connection for one solder lug and nut on each side.
The halves can be clamped together with a 2.5" long 10-24 screw and nut. The joint can be sealed with glue or beeswax, if the transformer is not dipped for sealing.
OpenSCAD file included, if you want to change the size, or make the top cover thinner.

Ferrite transformer case