G'day, The PCB provides a grounding pad for L4 and the circuit diagram shows primary L4 being grounded, however I can't see any evidence in the hires pictures that this was done. I'm inclined to use a short piece of braid to solder the backend of the L4 primary winding (braided part) to the grounding pad on the PCB. Do you have any advice? 73, Berndt VK5AB