The -20 dBm is measured with a 200 MHz scope: 60 mVpp sine at ANT
At 1W PEP...
That is therefore 50dB below peak which is not an excessive figure.
It is a long time since I tested mine so do not remember my estimate.
My theory was imbalance in internal capacitances. I seem to remember that I managed to reduce it by more than 10dB at one frequency by connecting short wires (~10mm) to some of the mixer pins and moving them around.
That seemed to confirm it was the mixer, that is all I did. I cannot explain how disconnecting T2 made no difference.
73 Alan G4ZFQ
