Another first - this is my first electronic measurement of the year. Julian - G4ILO ask (via comments) "what is the output power" of the Propeller 30m QRSS and low pass filter circuit.?
I do not have a power meter that measures that low, but I measured 1.1V p-p across an accurate non-inductive 50 ohm load. With P=(Epp/2x.707)^2/R, the measure power is; (1.1÷2×.707)^2÷50 = 3mW.
|Scale = .5v / Div|
But, looking at the ragged output waveform, I am becoming less hopeful that the Propeller will be useful for RF generation for radio work. The Propeller may be relegated to just control of other oscillators and/or displays.
Note: I would have expected more measured output voltage, because the Propeller is sourcing from an active 3.3V CMOS circuit. I need to investigate more.