{"product_id":"coil-form-drilled-with-hardware","title":"Coil Form Drilled with Hardware","description":"\u003cp\u003eCoil form made of high impact polystyrene 3.5\" diameter by 3\" long. Predrilled as supplied with \u003ca href=\"\/products\/solderless-crystal-radio-kit-5\/\"\u003eCrystal Radio Kit 5\u003c\/a\u003e and \u003ca href=\"\/products\/crystal-radio-kit-6\/\"\u003eCrystal Radio Kit 6\u003c\/a\u003e. For AM radio, when used with the \u003ca href=\"\/products\/variable-capacitor-266pf\"\u003eplastic variable capacitor dual section 266pf\u003c\/a\u003e, use 40 turns of 22 AWG magnet wire approximately 40 feet. Includes a location to center tap ground for inductive coupling of longer antennas. You may want to experiment with how many turns on the small coil side work best. I typically use 5 to 10 turns. Other wire can be used with the coil form. The \u003ca href=\"\/page\/lc-inductance-calculator\"\u003eLC Inductance Calculator\u003c\/a\u003e can be used to help determine the amount of wire and space required. On the large side of the coil there is approximately 1.25 inches and on the short side of the coil there is approximately 0.25 inches.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/winding-coil.pdf\"\u003eClick here for instructions for winding the coil.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eIncludes:\u003cbr\u003e\n1 - 3.5\" diameter x 3\" coil form (high impact polystyrene) predrilled\u003cbr\u003e\n3 - \u003ca href=\"\/products\/brass-4-40-screw-1-2\"\u003eBrass #4 1\/2\" Panhead Screws\u003c\/a\u003e\u003cbr\u003e\n9 - \u003ca href=\"\/products\/brass-4-40-nut\"\u003eBrass #4 Nuts\u003c\/a\u003e\u003cbr\u003e\n6 - \u003ca href=\"\/products\/brass-4-washer\"\u003eBrass #4 Washers\u003c\/a\u003e\u003cbr\u003e\n\u003c\/p\u003e\u003cp\u003eThis item does not include wire. Please see our selection of \u003ca href=\"\/product-category\/wire\/magnet\/\"\u003emagnet wire\u003c\/a\u003e and \u003ca href=\"\/product-category\/wire\/litz\/46-awg\/\"\u003elitz wire\u003c\/a\u003e.\u003c\/p\u003e\n ","brand":"Atomic 29","offers":[{"title":"Default Title","offer_id":61983956337010,"sku":"CFDH","price":6.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/coil-form-drilled.jpg?v=1782564622","url":"https:\/\/atomic-29.com\/products\/coil-form-drilled-with-hardware","provider":"Atomic 29","version":"1.0","type":"link"}