I've built a band pass filter to detect speed using a radar motion detector (IPM-165 http://nic.ath.cx/PDF/sensors/radar/CDM324-doppler/InnoSenT/InnoSenT_application_note_III_11_06.pdf).
Using PSpice I have simulated the circuit as well as building and testing on a breadboard. From the radar I receive values of approximately 5.4mV (Vamp) and 21.0143MHz.
There appears to be no AC voltage and therefore frequency after capacitor C1, is there any obvious reason for this that I am missing?
Any help would be greatly appreciated, I'm at a bit of a loss with it.