1985 Tektronix 1450 / 1450-1 TV Demodulator Instruction Manual 070-2200-01

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Yes we combine shipping for most multiple item purchases.Add multiple items to your cart and the combined shipping total will automatically be calculated. 1985 Tektronix 1450 / 1450-1 TV Demodulator Instruction Manual 070-2200-01 PREFACEThis manual documents the TEKTRONIX 1450-1 Television Demodulator. The 1450-1uses a plug-in down converter for channel selection. The appropriate down converterinstruction manual should also be consulted for information about using the 1450-1 and downconverter as a system.This Preface describes the contents of the manual, with a brief description of each sectionwithin the manual.The Table of Contents is a detailed list of all important pieces of information and theirlocation in the manual. Lists of Illustrations and Tables follow the Table of Contents.Operators Safety and Servicing Safety Summaries give general safety information aboutthe instrument.The manual is split into two parts, Operator’s Information and Servicing Information. Allpertinent information regarding the operation of the instrument is located in the Operator’spart. This will be of use to both the operator and the service technician. The Servicing partcontains that information necessary to effectively service the instrument. This informationshould be useful only to qualified service technicians.The Operator’s part includes Sections 1 and 2:Section 1 (Introduction and Specification) includes a general description of theinstrument, a safety summary, and the specification.Section 2 (Operating Instructions) includes information on installation, controlsand connectors, and operator familiarization.The Servicing part contains Sections 3 through 9:Section 3 (Theory of Operation) begins with a general overview of the instrumentfollowed by a detailed circuit description.Section 4 (Calibration) includes a Performance Check and an AdjustmentProcedure, and an equipment list.Section 5 (Maintenance) covers the standard electrical and mechanicalmaintenance; plus any special tools, unusual components, and special handling.Section 6 (Options) documents any options available with the instrument.Section 7 (Replaceable Electrical Parts) includes ordering information and partnumbers for all replaceable electrical parts.Section 8 (Diagrams) includes a block diagram, schematics, circuit boardillustrations, component basing diagrams, waveforms, parts locating charts, andadjustment location illustrations.Section 9 (Replaceable Mechanical Parts) refers to an exploded view drawing of theinstrument, and lists ordering information for all replaceable mechanical parts.Change and correction information after the manual has been printed is locatedbehind a tabbed page at the rear of the manual.The text and diagrams are in accord with, and based on, the following standards ofthe American National Standards Institute, Inc. (ANSI):ANSI Y1.1 — 1972, AbbreviationsANSI Y32.2 — 1975, Graphic SymbolsANSI Y32.14 — 1973, Graphic Symbols (Logic)ANSI Y32.16 — 1975, Reference DesignatorsINTRODUCTIONThe 1450-1 is a high-quality television demodulator.The RF section is easily interchangeable and can beordered for any channel. The IF section uses SurfaceAcoustic Wave (SAW) filters for a precise Nyquist slopeand exceptional stability. This stability means that verylittle maintenance or recalibration is required.Both synchronous and envelope detection is used inthe 1450-1. The synchronous-detection mode eliminatesquadrature distortion so thatthetransmitter output can becompared with the video input signal. The envelope-detection mode is used in conjunction with synchronousdetection to assess how a home receiver is affected bycertain transmitter distortions. A quadrature output fromthe synchronous detector is provided for measuringtransmitter incidental phase. When used with the videooutput, a vector display of the RF signal can be producedon an XY monitor or a 1480 Waveform Monitor with anexternal phase graticule.Visual and Aural Carrier Loss alarm lights are includedon the front panel. These LEDs light with a loss of eithercarrier. A set of relay contacts is available at the rear-panelREMOTE connector to drive an external alarm circuit. Therelay switches when either of the alarm lights activate, andwhen instrument power is lost.Both Split Carrier and Intercarrier sound detectionmethods are included in the 1450-1. Split Carrier is used toaccurately measure the aural transmitter. The I ntercarriermode is used to help determine the effects of picturecarrier FM noise on the sound signal.The audio section has three audio outputs and acalibrated-deviation output voltage. These outputs areused for monitoring and measuring parameters of theaural transmitter.The 1450-1 has a high dynamic-range, allowing a low-sensitivity input for a signal directly out of a transmitter,and a high sensitivity for a distant signal. An LED readoutindicates the input power level in dBm.A zero-carrier reference pulse is generated internally,or the 1450-1 can be driven by an external source (i.e., aTEKTRONIX 1440). This pulse establishes a reference formeasuring modulation depth… And much more! e31

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