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The Model DI-1 Oscilloscope was specifically designed to meet the needs of the single sideband enthusiast who uses an accessory with his S.S.B. exciter, such as a linear Amplifier or transmitting Converter. The DI-1 takes the guesswork out of tuning and adjusting these Accessories for best linearity consistent with maximum, efficiency under actual operating conditions regardless of voice characteristics. It may also be used as a % modulation indicator for AM transmitters or for carrier and sideband suppression adjustments of single sideband exciters. The trapezoid pattern display is used for most applications; however, a 60 cycle sweep is provided for an envelope display if It should be desired. '.’hen using the trapezoid mode of application, the Oscilloscope beam Is cut off when no RF is present at the high level connectors of the oscilloscope. This prevents burning a spot on the face of the cathode ray tube during standby periods. By studying the interconnecting diagrams you will be able to select the method of application desired for your particular requirement. Description The DI-1 Is a 3" Oscilloscope supplied with a green Filter and sealed bezel to provide a clean, clear display in an average bright operating area. It is enclosed in a dark grey, durable steel cabinet of modern styling with rubber feet. The low and high voltage, hum-free Power supply is built In. Connections are provided at the rear of the scope for all functions. An accessory socket, below the chassis, accommodates a Plug-In two-tone Oscillator, Model TT-1, when it is required. The output from the two-tone Oscillator Is connected to the exciter microphone Input connector. See 7ig. 3, Tags 7. The size of the vertical display Is controlled by the 6-step vertical attenuator. Steps 1, 2, or 3 are used for higher powered transmitters while the remaining steps provide increasing sensitivity for the lower powered transmitters. The horizontal size knob controls the gain of the horizontal Amplifier which provides control over the width of the display In either the trapezoid or envelope functions. The centering of the display is controlled by the vertical and horizontal centering controls, while intensity and focus provide the control over the brilliance and clarity of the display. The AC power for the scope and the DC power for the two-tone Oscillator (when installed) are controlled by a rotary switch. A pilot lamp, when lit, indicates that the power is on.