aaron_do
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Hi,
you could try a few things.
1) directly connect the transmitter to the receiver using a wire just to check that the everything is working. Or you could directly feed an input into the receiver from a signal generator, and also directly measure the transmitter output using an oscilloscope.
2) after doing the above, make sure the bpf center frequency is correct.
3) Maybe the antenna (a wire?) isn't long enough. Maybe it's not pointing in the right direction. If they're just wires I believe they should both be pointing up.
cheers, Aaron
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