New Test Equipment for Transponder and VOR/ILS

New equipment to be described includes a cockpit-operated transponder checker with frequency measuring capability and direct-reading binary and octal display, a digitally-controlled VOR/ILS audio signal generator with resolution of 0.01 deg and 0.001 ddm, and an updating program for HP211A/SG-1A RF signal generators providing zero phase shift, high-precision modulation measurements, leveled RF outputs, and single-chassis construction.