Modifying my R-4C

Process phases

Factory original R-4C
Original R-4C
R-4C half modified
Modifying R-4C
R-4C fully modified
R-4C completed
Top view of the R-4C with the new filter of the first FI installed
Top panel view
Rear view of the R-4C with the DDS inputs installed
DDS wiring connectors

Final details

Schuko adapter used in the entire Drake line so as not to cut the original plug
Schuko adapter
FCN PRO filter with 6 Khz bandwidth and shape factor < 4
FCN PRO filter shape factor < 4