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In Step 4: Filters, the link for changing bandpass filters is broken. I think this is the correct link:http://k7mem.com/Fil_2nd_Active_BP.html
There is no list of parts or schematic at the link provided. Also, one must create an account with PCBway to download the gerbers. Can you please put the files here in instructables?
What is the part number for the coil?
What output voltage did you get on the receiver?