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Bandpass sampling of high frequency chirp

Hi,

I am required to transmit a high frequency chirp(270k-330kHz) at a sampling rate of 2 MSps and then receive it at a downsampled rate of 135KSps and then to filter out the baseband portion of the downsampled signal. I have generated the chirp at a sampling rate of 2MSps and received it through DAQ assistant. I am not able to downsample it. Is changing the sample rate of DAQ assistant enough for downsampling? Why am I not getting any baseband signal after filtering.

Attached is the transmitter vi.

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