The project schematics for the Dual-Band ARDF Transmitter, Dual-Band ARDF Receiver, and the Digital Interface Module have all been updated to include support for remote control using in-band control signals. Updated schematics are available here:
http://openardf.org/index.php/ardf-open-equipment-project/documents/
Summary of changes:
Receiver
o PLL signal detection circuit has been added
Transmitter
o Antenna T/R switch has been added
Digital Interface
o Expanded Cloning connector to support sharing of antennas between Rx and Tx
As always, please let me know if you identify any errors, omissions, or better ways of doing things.