## Board design files

This directory contains Eagle CAD files as well as schematic PDFs and Gerber exports for board fabrication.

The board stackup is good enough for either OSH Park 4-layer, or JLCPCB 4-layer with controlled impedance (JLC2313). 


### Latest Board

Revision 11.5.2 does away with the (hard to source) regulator from ST and replaces it with a Zener + NPN combination that delivers about 8.5V to the PA under load.

### Breakouts
These directories contain Eagle and FreeCAD files for the NMEA0183, NMEA 2000 and USB adapters. Their front panels are PCBs so gerbers are
here as well. The UART+USB adapter is a very basic breakout board for those who would rather wire the transponder themselves.

### Antenna
This directory contains FreeCAD and STEP exports of the 3D printed parts that make up the antenna.