Hi everyone,
The output signal of the companion board seems to be dirty with many spikes (see photo). I am using channel D. A 50 Ohm load is connected to the input (CHDI) and the output (CHDO) is connected to a spectrum analyzer. Here you see the entire span of the 2 GHz of IF. I have tried different LOs. They change the spikes but they don’t go away. The board is in downconversion mode with LNA+Mixer+PA enabled and the LO is fed to channel D. Is this normal?
The board is powered by external 5 volt. Using or not using external 10 MHz reference makes no difference.
