I get 40V with dhe RF probe (2x Voltage Peak of die Wave => about 4Watts). But no Sigs at the BNC connector anymore. Seams to be something destroyed between the P.A. and the low passes ? Any idea? I designed the QDX fpr 12V 3:2 Transformer.
Matthias,
When testing the PA I suggest powering the QDX with as low a voltage as possible, 7 volts or less, I'm not sure of the absolute minimum. Possibly as low as 5.5 volts, The regulators are specified 1 volt drop-out.
Check C34 and all soldered joints on LPF inductors.
Operation of the BPF selection can be checked on receive. Testing volts at L5, 7 or 9 should show low (0.6 volts?) on the selected band.
73 Alan G4ZFQ
