Since I’ve got my radio amateur license I’ve reached the limits on the band pass filters integrated in the RSP1A receiver.

My location is near some high power transmitters and they where constantly overloading the receiver’s front-end. That created a lot of false signals and a high noise base line that made HF reception difficult / impossible on some days.

To fix it, I had to create a set of band pass filters that can be attached in front of the receiver. Another requirement was the ability to electronically switch them, to reduce  the wear on the receiver SMA inputs.