Hi all, I want to sample first 250KHz on the channel. I am using the (sampling_with_lowpass.JPG) setup to extract quadrature samples. I have LFRX card where i just use the RX-B pin to extract complex samples from the channel.
My question is (question.JPG) how are the two setups different, assuming the connections are correctly made. a) I set the sample rate= 250KHz, and center freq=125KHz. b) I set the sample rate=500KHz, and center freq= 0 KHz (I hope the card is fine with setting center freq=0) Q1 ) I understand that the sampling rate will be different, but I should be getting the samples from same bandwidth ? 0-250KHz Q2 ) in b), how do i interpret the negative frequencies in complex FFT. ( I understand these are frequency in opposite direction acc to books, but not sure if they make sense here, and hence I am doing way a) ) Apologies, I am CS student so I might not be very clear with my EE fundamentals. Thanks, Abhinav LFTX setup- http://postimg.org/image/9s6hy4rqp/ sampling_with_lowpass - http://postimg.org/image/qkpeeqgz5/ question - http://postimg.org/image/3mjsmwcc1/
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