{"id":321,"date":"2015-08-25T14:31:00","date_gmt":"2015-08-25T14:31:00","guid":{"rendered":"http:\/\/machineryequipmentonline.com\/video-equipment\/uncategorized\/tape-deck-mechanics-and-servicingalignment-tape\/"},"modified":"2015-08-25T14:31:00","modified_gmt":"2015-08-25T14:31:00","slug":"tape-deck-mechanics-and-servicingalignment-tape","status":"publish","type":"post","link":"http:\/\/machineryequipmentonline.com\/video-equipment\/tape-deck-mechanics-and-servicingalignment-tape\/","title":{"rendered":"TAPE DECK MECHANICS AND SERVICING:ALIGNMENT TAPE."},"content":{"rendered":"<div class=\"fmoau6a0dc83fb9cd4\" ><script type=\"text\/javascript\">\n\tatOptions = {\n\t\t'key' : '61e5902552e2353963d8d2f1bd1f4a8f',\n\t\t'format' : 'iframe',\n\t\t'height' : 250,\n\t\t'width' : 300,\n\t\t'params' : {}\n\t};\n<\/script>\n<script type=\"text\/javascript\" src=\"\/\/www.highperformanceformat.com\/61e5902552e2353963d8d2f1bd1f4a8f\/invoke.js\"><\/script><\/div><style type=\"text\/css\">\r\n@media screen and (min-width: 1201px) {\r\n.fmoau6a0dc83fb9cd4 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.fmoau6a0dc83fb9cd4 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.fmoau6a0dc83fb9cd4 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.fmoau6a0dc83fb9cd4 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.fmoau6a0dc83fb9cd4 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<h3 align=\"justify\">ALIGNMENT TAPE<\/h3>\n<p align=\"justify\">For each format a reference cassette, called an <i>alignmen<\/i><i>t <\/i>or <i>interchange <\/i>tape, is available from videorecorder manufacturers. It is recorded on a specially produced and aligned \u2018model\u2019 machine at the factory, and all its characteristics are centre-tolerance. It contains colour-bars, monochrome step-wedge, and test-card images for checks on all aspects of the replay machine. An important feature is an <i>r<\/i><i>.f. sweep <\/i>signal in which the entire tape-frequency spectrum is covered in one 20 ms \ufb01eld period. An oscilloscope connected to the f.m. replay signal and triggered from the head \ufb02ip-\ufb02op waveform will thus display a graph of overall replay frequency response; suitably- positioned markers facilitate the check and evaluation of the response of the video heads and preamplifers. An oscilloscope-type display of the r.f. sweep pattern is reproduced in Fig. 14.12.  <\/p>\n<p align=\"justify\">Audio aspects of the alignment tape include an l.f. tone for audio level checking and adjustment, at an accurately speci\ufb01ed frequency for replay capstan speed checks. An h.f. tone checks A\/C head azimuth setting. Test tapes are also available with Hi-Fi sound tracks; and recorded to LP speci\ufb01cations for VHS and V8 formats.  <\/p><div class=\"lydpb6a0dc83fb9de3\" ><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-0778475562755157\"\n     crossorigin=\"anonymous\"><\/script>\n<!-- 300x600 television-and-video -->\n<ins class=\"adsbygoogle\"\n     style=\"display:inline-block;width:300px;height:600px\"\n     data-ad-client=\"ca-pub-0778475562755157\"\n     data-ad-slot=\"6549443290\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/div><style type=\"text\/css\">\r\n@media screen and (min-width: 1201px) {\r\n.lydpb6a0dc83fb9de3 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.lydpb6a0dc83fb9de3 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.lydpb6a0dc83fb9de3 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.lydpb6a0dc83fb9de3 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.lydpb6a0dc83fb9de3 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<div class=\"easci6a0dc83fb9d67\" ><script type=\"text\/javascript\">\n\tatOptions = {\n\t\t'key' : '0c1eb4c533eaedb7b996f49a5a4983a9',\n\t\t'format' : 'iframe',\n\t\t'height' : 300,\n\t\t'width' : 160,\n\t\t'params' : {}\n\t};\n<\/script>\n<script type=\"text\/javascript\" src=\"\/\/www.highperformanceformat.com\/0c1eb4c533eaedb7b996f49a5a4983a9\/invoke.js\"><\/script><\/div><style type=\"text\/css\">\r\n@media screen and (min-width: 1201px) {\r\n.easci6a0dc83fb9d67 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.easci6a0dc83fb9d67 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.easci6a0dc83fb9d67 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.easci6a0dc83fb9d67 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.easci6a0dc83fb9d67 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n\n<p align=\"justify\">Alignment tapes are expensive, and the test sections on them very short. To avoid wear, and particularly to eliminate the risk of dam- age, they should never be used where their particular qualities are not essential, and should <i>never <\/i>be placed in a machine which has not been <i>proved <\/i>mechanically safe. Much work which requires the use of an alignment tape can be carried out with a locally recorded substitute: take a high-grade tape and record colour-bars, grey-scale step-wedge and test card, with tones from an audio generator or the broadcast signal. Use a new, well set-up machine on which the real alignment tape plays perfectly at tracking-control centre. For all applications (except sweep-checking of video f.m. preamps) use this tape, followed if necessary by one pass of the alignment tape as a \ufb01nal check. In the text that follows the term \u2018test tape\u2019 refers to the alignment tape or the above-described substitute.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>ALIGNMENT TAPE For each format a reference cassette, called an alignment or interchange tape, is available from videorecorder manufacturers. It is recorded on a specially produced and aligned \u2018model\u2019 machine at the factory, and all its characteristics are centre-tolerance. It contains colour-bars, monochrome step-wedge, and test-card images for checks on all aspects of the replay [&hellip;]<br \/><a href=\"http:\/\/machineryequipmentonline.com\/video-equipment\/tape-deck-mechanics-and-servicingalignment-tape\/\" class=\"more-link\" >Continue reading&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"aioseo_notices":[],"views":668,"_links":{"self":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/321"}],"collection":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/comments?post=321"}],"version-history":[{"count":0,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/321\/revisions"}],"wp:attachment":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/media?parent=321"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/categories?post=321"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/tags?post=321"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}