I have built and tested an active band pass filter, with the intention of creating a speed detector, whose lower and upper cut off frequencies are 48 Hz and 1591 Hz respectively. During testing I confirmed attenuation of voltages out-with the bandwidth above and subsequent amplification. This was using a signal generator where of course, I could send the desired frequency through the circuit.
When I began using the radar module, transmitted frequency is 24 GHz (https://shop.bb-sensors.com/out/media/Datasheet_RADAR-IPM-165_DBE_Rev01.pdf), the received frequency was around 80 MHz and of course, voltage at this range even after amplification was extremely small.
Is there any way I can control the received frequency so I can analyse the frequency? If this isn't something that is possible, is there any other way I can analyse the received frequency?
I'm completely running out of ideas and thought this almost feels like last chance saloon.
I've added pictures of the circuit, radar input and circuit input and signal generator input and output.
As can be seen from the circuit diagram below, the radar is the input to the entire circuit. Both oscilloscope images display inputs and outputs. The outputs appear to be similar when a very large frequency is applied to the circuit, much larger than that of the upper cut off frequency.