Re: Using an SDR with QCX

Erik Kaashoek

Hi Guido

Its RF leakage through the antenna input
The receiver was tuned to 10 MHz. A spectrum analyzer (home build) is connected to the antenna input of the receiver.
The graph shows what the spectrum analyzer sees.
The receiver has a divide by 4 to be able to create the 90 degrees phase shift signal. So what I see is either leakage from the SI5351 (outputting 40MHz), the connection between SI5351 and the receiver (also at 40MHz) or through the receiver PCB where the 40MHz is divided by two times 2. 

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