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An Introduction to Amateur Television

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An Introduction to Amateur Television An Introduction to Amateur Television By Mike Wooding G6IQM and Trevor Brown G8CJS Acknowledgements The Editors wish to thank the following people for their help with the production of this book, for their work in the production of new projects for the book, and in some cases, for just being there! Bob Robson GW8AGI Bob Platts G8OZP Marc Chamley F3YX Paul Marshall G8MJW Brian Summers G8GQS Clive Reynolds G8EQZ Richard Guttridge G4YTV Pauline Brown Kim Wooding This special A4 sized edition edited by Ian Pawson, August 1998 Editors note: This book was originally printed A5 size. This version has the same content, but has been rearranged to A4 size. The quality of some of the diagrams and pictures is not up to our usual standard as they have been scanned in from an original paper copy. ISBN 0-9513779-2-2 Contents Contents Acknowledgements............................................................................................................................................................................... 1 Contents ................................................................................................................................................................................................. 2 Foreword................................................................................................................................................................................................ 4 The Principles of Television................................................................................................................................................................. 5 The Signal................................................................................................................................................................5 Scanning ..................................................................................................................................................................5 Colour TV................................................................................................................................................................8 Coding and Decoding ..............................................................................................................................................9 The Phase Alternate Line System (PAL).................................................................................................................9 The `Y' Signal..........................................................................................................................................................9 Colour Difference Signals......................................................................................................................................10 The National Television System Committee Standard (NTSC) ............................................................................11 The Pal System ......................................................................................................................................................12 Setting up your TV Station................................................................................................................................................................. 15 The Video Section .................................................................................................................................................15 The Rf Section .......................................................................................................................................................17 Coaxial Feeders......................................................................................................................................................18 RF Connectors .......................................................................................................................................................18 Aerials....................................................................................................................................................................19 Aerial Polarisation .................................................................................................................................................19 Video Sources...................................................................................................................................................................................... 21 Monochrome Pattern Generator.............................................................................................................................21 Four-Input Vision Switcher ...................................................................................................................................21 TTL RGB Colour Bar Generator ...........................................................................................................................21 PAL/NTSC Colour Encoder ..................................................................................................................................21 Rainbow Electronic Callsign Generator ................................................................................................................22 TTL RGB Switcher................................................................................................................................................28 Fade-To-Black .......................................................................................................................................................28 Computers as Video Sources .................................................................................................................................29 Sinclair Spectrum...................................................................................................................................................30 The BBC................................................................................................................................................................31 BBC Listing 1: Test Card with Call sign ...............................................................................................................32 BBC Listing 2: Colour Bars...................................................................................................................................33 Colour from the BBC.............................................................................................................................................33 The Commodore Amiga ........................................................................................................................................34 The Atari ST ..........................................................................................................................................................34 The PC ...................................................................................................................................................................35 A 70cm Amateur Television Station ................................................................................................................................................. 36 A 70cm Down Converter.......................................................................................................................................36 Construction...........................................................................................................................................................36 Parts List ................................................................................................................................................................38 Alignment ..............................................................................................................................................................38 70cm Preamplifier..................................................................................................................................................40 The GaAsFET Preamplifier ...................................................................................................................................40 Construction...........................................................................................................................................................40 Alignment ..............................................................................................................................................................42 The Bipolar Preamplifier .......................................................................................................................................42 Power Supplies ......................................................................................................................................................42 A 70cm ATV Transmitter......................................................................................................................................43 Introduction............................................................................................................................................................43 Construction...........................................................................................................................................................44 Initial Setting up Procedure ...................................................................................................................................45
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