The RCA TK-1C test pattern generator

The RCA TK-1C Monoscope Camera

This camera was designed to produce a video signal of high and dependable quailty for use with or without synchronizing pulses. The fixed pattern provided is suitable for checking resolution capabilites, low-frequency phase shift, contrast, and deflection linearity of other television studio equipment., as well as providing a modulating signal for transmitters. When the camera output is imployed to modulate an RF signal generator, the resultant signal may be used to check receiver preformance. The Monoscope Camera utilizes a recessed type chassis, designed for mounting in a standard 19-inch rack.

The TK-1C pictured above has the classic Indian Head Test Pattern. The monoscope tube contains the fixed pattern of carbon deposited on an aluminum plate. When the fixed pattern is scanned, electrons emitted are collected on an electrode which is in the form of a conductive coating on the tube. Although the coating is a-c coupled to ground, it is at a positive potential with respect to the pattern. The picture signal, therefore, appears between the pattern plate and ground.

The Indian Head Test pattern, is picked up through a UHF connector on the rear of the unit. Many television stations used this pattern in the 1940s to the 1970s as a "test pattern" for their stations.

The actual Indian Head Test Pattern from the TK-1C

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Last modified on Friday, February 18, 2000