The next phase of this project replaced the prototype controller with a MapleDSP Pi HAT implementation that provides basic repeater control, ID and timing, analog voltage monitoring and digital linking capabilities over an IP network. The board was realized using 0805 surface mount components, and was factory built. The interface board was realized in through-hole component to make it simpler for amateurs to modify or customize.
The connector on the Pi HAT is a standard 8-pin ethernet type, with LED’s to indicate power on and PTT status. It is wired to an interface board, that was cloned from the previous Arduino board in Phase 1, but without the PWM capability and with adjustable audio levels in and out. Connection to the radio was maintained with the same RCA type jacks, and the power, COR and PTT are connected to a barrier strip on the board. COR Sensitivity is programmable by a jumper on the board.
The project was successful and deployed to two repeaters, VE6NHM and VE6CQM. The linking has been active and operation for over 2 years.