Hi Petronel,
The SWR you measure from the tandem match (4.66V and 1.04V) is equal to 1.5 which is? quite high for a 50 ohms dummy load. Are you sure of your dummy load ? If yes, the tandem match seems not very good and this is quite common especially at high frequencies.
Do you measure the same voltages at 1.8 or 3.5MHz ?
RF filtering needs more than 10pF. At the ADC there is no trouble to use a greater value (1nF or more).
73
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