Amateur Television (Atv)

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AMATEUR TELEVISION (ATV) Amateur Television (ATV) is the hobby of transmitting broadcast-quality video and audio over radio waves allocated for Amateur Radio using the broadcast standards of NTSC in North America and Japan, and PAL or SECAM in Europe and elsewhere, using the full refresh rates of those standards. It also includes the study of building of such transmitters and receivers and the propagation between these two. ATV is an extension of amateur radio. It is also called HAM TV or Fast Scan TV (FSTV). Ham operators are also allowed to transmit Slow Scan TV (SSTV) which is similar to video facsimile. SSTV may be transmitted within the voice segments of all ham radio frequency bands except 30 meters (28 - 29.7 MHz), though it is used primarily below 28 MHz. In North America, transmissions are typically sent from repeaters on four UHF channels below the UHF TV broadcast band (air channels 14 to 69) (between channels 13 and 14, in the 70 cm ham band). These can be received on a cable-ready NTSC-format TV or set-top box tuned to cable channels 57 to 60 (420-444 MHz). HAM TV - as it is also called - provides video co-ordination of many public service events and, along with traditional amateur radio, provides much needed "eyes" in natural disasters. Source: Wikipedia contributors, "Amateur television," Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/w/index.php?title=Amateur_television&oldid=186092383 (accessed February 4, 2008). MARC owns an ATV repeater. The transmitter is on 426.25 MHz which equates to channel 58 on a cable-ready tuner. The signal is vertical polarization. 439.25 MHz is used to transmit into the repeater. If you are interested in ATV, contact Danny Carpenter (N4UXY), [email protected] 251-554-8626.

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AMATEUR TELEVISION HANVDOLB2OOK TREVOR BROWN “w “-3.... _r -. _B___RITISH AMATEUR TELEVISIONCLUB 9H|LLCREST, 33:22.. a. HANTS, , R626 lwooo 6J8 oouom1 A VHF/UHF COMMUNICATION rmmmnl JOMITHE- S. P. G. '3 (without your size '10'::.....! You could be a sync pulse generator with a W 8: D product. Our runny years of experience in the commercial communication sector Imm- benefited the amateur market with an extensive range of r01 inm- well designed products. These are available in kit or assemhlwl module form and a limited number as boxed ready to go units. For your TV requirements whether AM or FM contact us. Full (II-Mill. of our complete range will be forwarded on receipt of a lar‘gv :‘.Al-.. We will also be very pleased to quote on any commercial enquiry be it for TV or telemetry. Please telephone for assistance. Wood and Douglas are an independant British partnership who hnw served the UK amateur market for seven years. Why not sumuu I. II|I\ £?! 07356 5324 ACKNOWLEDGEMENTS ﬂhe british Amateui television LlLL expresses its gratituce to the Lollowing companies, Leeleties anc incivicuals who Lave ptovroeo material and assistance Let this publication. k.b.G.B. Loughty :tLeet, Lonocn. E.b.b.b. microwave Committee Raoxo Bet. karis. A.b.A.k. bermany. masco Electronics, Lancaster. Mrs. Eaullne N. brown miss Latherine A. white L. Lalla thzec L.c. Lixcn baLbh C.L. bllLOtt samba A. Emmerson GBPlh P. Llekeootough GBPXL G. bhirville ubVZV EDITED BY TREVOR BROWN, G8CJS. LAYOUT BY PETER DELANEY, GBKZG. DRAUGHTED BY CHRIS SHARPE. OCTOBER 1982 CONTENTS CHAPTER ONE eLow SCAN TELEVISION PAGE CHARACTER GENERATOR l SYNC PULSE AND PATTERN GENERATOR 8 CHAPTER TWO TELETYPE PIGGY BACK MEMORY ll ASCII KEY bOARDS 19 CHARACTER COLOURIZER 24 SIMPLE SYNC PULSE GENERATOR 28 CHAPTER THREE VIDEO EFFECTS VISION SWITCHER 31 VISION MIXING 38 COLOUR SYNThESIZER 45 CHAPTER FOUR 70¢ms TELEVISION V.S.B.
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