Encouraged by the results of the [80m/60m] filter I implemented my [40m/30m] filter to go with it. The attached VNA sweeps include the LPF both diode switches and the coupler. I was about to measure Tx harmonics when I dropped a crocodile clip on the back of the PCB. I guess there's a law about these things but it landed across the 12V DC input jack and the 5V Vdd pin. Entirely my fault but fireworks and a fried QMX as would be expected. So no more work on this, but if anybody wants details of either LPF just let me know.
