I began doing an alignment on the FPM-300 in an attempt to troubleshoot my deaf 15 meter band issue. One of the first steps in the service manual is the alignment of the VFO/Premixer band pass transformers. 40, 20 and 10 all checked out fine, but 15 meters was far lower than it should have been. I peaked the T403 transformer for maximum peak-to-peak on my oscilloscope and then tested the receiver. It now receives well on 15 so now I’m off to troubleshoot the VOX circuit.