Dear all,
I have bought a microwave Doppler detector to evaluate the detection distance. However, I find that its detection range is not as good as its claim, which describes that it can detect thieves outside the house through the door, and can be used to compute car velocity. I found that the free air space range is only about 1m using the CRO to see.
The specification can be downloaded at here:
formatting link
Do I need to add external circuit to amplify and/or filter the output IF signal?
Thanks!