T140 1:1 Balun box

thingiverse

This is a Current Balun box that fits a T140 toroid wrapped with 22awg PTFE wire. (Edit 3/24/23 SO239 Bolt on box updated with more robust mount points) To build this out you will need the following additional gear items 4x 22awg PTFE wire (each one is about 70 cm or ~28 inches) 1x T140 toroid (43 mix or 31 mix. your preference for the frequencies you want to build out for) 4x 30mm M3-0.5 bolts 4x M3 bolts Pick style box you want (you only need one box and one lid. you have 2 options to choose from). If using screw/bolt down chassis mount SO239 connectors make sure you print the 2 files for that. The lid sizes are slightly different. This is an example bulkhead connector https://www.amazon.com/gp/product/B0BFWFGVJ7/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1 This is the chassis mount connector https://www.amazon.com/dp/B089ZZZZDS/ref=sspa_dk_detail_0?psc=1&pf_rd_p=88097cb9-5064-44ef-891b-abfacbc1c44b&pf_rd_r=28K4JKVM8Q15TW804NHH&pd_rd_wg=8RR7K&pd_rd_w=ilHQx&content-id=amzn1.sym.88097cb9-5064-44ef-891b-abfacbc1c44b&pd_rd_r=3d9e03ff-bbf5-47f1-a22b-4536ad980ad8&s=industrial&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWw&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyUjFBTEw3OVU3MzFVJmVuY3J5cHRlZElkPUEwMTQxMDc2M01JRE0ySE9GREhXMiZlbmNyeXB0ZWRBZElkPUEwMTIyNTEwM0QyUE1ZOThOTDMxVyZ3aWRnZXROYW1lPXNwX2RldGFpbCZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=