Drake-r-4b-modification KITS – Manual (PDF)
Drake R-4B Modification KITS Manual: Guide for technicians to modify and enhance the Drake R-4B receiver. File size: 422.4 KB.
KITS
Hp-11644a-series-cal KITS – Manual (PDF)
HP 11644A Series CAL Kits Manual PDF (1.1 MB): Provides calibration procedures for technicians.