Bitx40 band pass filter


Like many in the group I have recently got a new toy - the NanoVNA. As part of my learning curve in how to use a VNA I have been looking at the Bitx40 band pass filter. Attached is the result. I had not expected to find 14dB loss but I guess that is the result of thin wire, small cores. The shape of the response compares well with the predicted plot in the Bitx40 Circuit Description page on
73 Brian VK4BAP