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The Vectorscope is an oscillograph for the display of signals which consists of amplitude and/or phase modulation of a carrier at some specific center frequency. The Vectorscope displays amplitude-modulation as the radial distance of the scanning spot from center screen, and instantaneous phase as the angle counted from a fixed phase reference, say North, on the Vector screen.
Broadcast and Television Receivers, Transactions of the IRE Professional Group on (Volume:PGBTR-8 , Issue: 1 )
Date of Publication: Oct. 1954