FT240 size case for HF choke

thingiverse

This is a case I designed for a FT240 size toroid for a common mode choke. You can find more information here: https://www.hfkits.com/manual-common-mode-choke/ I used a FT240-43 which works better for around 40 meter band and up for HF. The FT240-31 type works better for the lower frequencies. I wrapped my PTFE coated 16AWG wire twelve times on the separate halves of the toroid in opposite directions. The link above gives you all the info you need to build this choke. The screws are M4 around 20mm long. The smaller choke in the pictures can he found here: https://www.thingiverse.com/thing:4880460 toroid: https://www.amazon.com/gp/product/B07Y6NQRGF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 wire: https://www.amazon.com/gp/product/B003N3FTGQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B003N3BPRI/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 SO239 bulkhead connectors: https://www.amazon.com/dp/B078HHG8VR?psc=1&ref=ppx_yo2_dt_b_product_details