Hi all,
I have done some measurements using a QDX-LowBands, 50W QCX PA and ATU-100 upgraded for QRP.
It is not the measurement of voltage at MOSFET's drain as we all are curious about but rather at the PA BNC output connector.
The setup:
WSJT-X --> QDX --> 50W QCX PA --> ATU-100 --> Load
QDX 20m, built for +12V supply at +8V
50W QCX PA at +12V, RF output about 5W
Load: 50 Ohm and Open
Please see photos in the attachment.
y scale 20V / div, x scale 500 ms.
73 Bojan S53DZ
