{"product_id":"digitrax-tf4-quad-dcc-function-decoder-with-integrated-transponder","title":"Digitrax TF4 | Quad 4-Function DCC Decoder with Integrated Transponding - 1A Continuous, Hardwire Install | Multi Scale","description":"\u003cdiv class=\"sectionContent\"\u003e\n  \u003cp\u003eThe Digitrax TF4 is a quad-function DCC decoder with integrated transponding — four independently controlled function outputs on one tiny board, plus Digitrax's position-tracking feature built right in. Perfect for adding ditch lights, mars lights, rear markers, classification lamps, smoke generators, or any other DCC-controlled accessory cluster to a non-decoder locomotive.\u003c\/p\u003e\n  \u003cp\u003eLooking for more DCC decoders and electronics? Browse our \u003ca href=\"https:\/\/squeakystrains.com\/collections\/dcc-decoders\" target=\"_blank\"\u003eDCC Decoders\u003c\/a\u003e and \u003ca href=\"https:\/\/squeakystrains.com\/collections\/electronics-wiring\" target=\"_blank\"\u003eElectronics \u0026amp; Wiring\u003c\/a\u003e collections.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sectionTitle\"\u003eFeatures\u003c\/div\u003e\n\u003cdiv class=\"sectionContent\"\u003e\n  \u003cul\u003e\n    \u003cli\u003eFour independent DCC-controllable function outputs (white, yellow, green, purple) — control each one separately via your throttle.\u003c\/li\u003e\n    \u003cli\u003eIntegrated transponding — Digitrax position-tracking built in, no separate transponder board needed.\u003c\/li\u003e\n    \u003cli\u003e1A continuous, 2A peak combined function output — plenty for headlights, ditch lights, rear lights, smoke, or accessory clusters.\u003c\/li\u003e\n    \u003cli\u003eHardwire install with color-coded leads — works in HO, N, O, S, and G scale.\u003c\/li\u003e\n    \u003cli\u003eFull CV programming including FX3 lighting effects (Mars, Gyralite, Strobe, Random Flicker, Soft On\/Off, Rule 17, etc.) on every output.\u003c\/li\u003e\n    \u003cli\u003eSuperSonic silent-running operation, NMRA DCC compatible.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sectionTitle\"\u003eMore Information\u003c\/div\u003e\n\u003cdiv class=\"sectionContent\"\u003e\n  \u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eDigitrax\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eItem Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eTF4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eQuad function-output DCC decoder with transponding\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eFunction Outputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e4 (white, yellow, green, purple) — 1A continuous combined\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eMotor Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eNone — function-only decoder\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eTransponding\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eIntegrated (no add-on board needed)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eConnection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eHardwire — color-coded leads\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eScale Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eHO, N, O, S, G (any DCC scale)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eNew — sealed\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eUPC\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e652667100083\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sectionTitle\"\u003eFAQ\u003c\/div\u003e\n\u003cdiv class=\"sectionContent\"\u003e\n  \u003cp\u003e\u003cstrong\u003eWhat's the difference between the TF4 and the TL1?\u003c\/strong\u003e\u003cbr\u003eThe TL1 has one function output; the TF4 has four. If you need to control multiple separate lighting circuits (headlight + ditch lights + class lamps + rear marker) the TF4 is the right call. Both have integrated transponding.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eDoes this drive a motor?\u003c\/strong\u003e\u003cbr\u003eNo — the TF4 is function-only. For motor + lights in one board, use a full mobile decoder like the Digitrax DH126 or DZ126.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eWhat can I wire to the function outputs?\u003c\/strong\u003e\u003cbr\u003eLEDs (with resistors), incandescent bulbs, smoke units, ditch lights, mars lights, signal lamps, sound modules — anything DC-driven under 1A combined draw. FX3 effects make each output simulate prototypical lighting patterns independently.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eWill it work with any DCC system?\u003c\/strong\u003e\u003cbr\u003eYes — standard NMRA DCC. Transponding readback requires a Digitrax LocoNet command station with detection sections (BDL168, BDL16, etc.).\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Digitrax","offers":[{"title":"Default Title","offer_id":48208784785663,"sku":"TF4","price":16.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0443\/5968\/0161\/files\/image_684d5ec2-b29f-4598-b2c2-ceddd052fe89.jpg?v=1771768116","url":"https:\/\/squeakystrains.com\/products\/digitrax-tf4-quad-dcc-function-decoder-with-integrated-transponder","provider":"Squeaky's Trains \u0026 Things","version":"1.0","type":"link"}