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TURNIPSCHOOL - An open source reimagining of COTTONMOUTH-I This is an experimental design for a USB hub + CC1111 dongle hidden within a USB plug. It is intended to work with RfCat: https://bitbucket.org/atlas0fd00m/rfcat TURNIPSCHOOL is part of the NSA Playset: http://www.nsaplayset.org/turnipschool This design was made with KiCad: http://www.kicad-pcb.org/ order of copper layers: Copper 1: C1F (front) Copper 2: C2 Copper 3: C3 Copper 4: C1B (back) PCB description: 4 layer PCB 0.0646 in Copper 1: 1 oz copper (1.4 mil) Dielectric 1-2: 6.7 mil prepreg Copper 2: 0.5 oz copper (0.7 mil) Dielectric 2-3: 47 mil core Copper 3: 0.5 oz copper (0.7 mil) Dielectric 3-4: 6.7 mil prepreg Copper 4: 1 oz copper (1.4 mil) FR408 or similar substrate with Er=3.66 (+/- 0.1) double side solder mask double side silkscreen 5 mil min trace width and 5 mil min isolation PCBs of this specification are available from OSH Park.