{"id":871,"date":"2006-10-26T16:12:54","date_gmt":"2006-10-26T05:12:54","guid":{"rendered":"http:\/\/hifi-writer.com\/wpblog\/?p=871"},"modified":"2011-06-06T11:26:40","modified_gmt":"2011-06-06T01:26:40","slug":"cable-quality-suddenly-becomes-important","status":"publish","type":"post","link":"http:\/\/hifi-writer.com\/wpblog\/?p=871","title":{"rendered":"Cable quality suddenly becomes important"},"content":{"rendered":"

A while back I mentioned how I’d found Australian interconnect company, Kordz, to be a very good deal for HDMI cables<\/a>. I first stumbled across Kordz<\/a> in an article in Connected Home Solutions<\/a> (for which I write), which was discussing cables. David Meyer from Kordz had been interviewed and was expressing concern about the quality of some of the HDMI cables on the market.<\/p>\n

Naturally I reserved judgement. I could see the point that cheap cables may not carry the bandwidth to support full 1080p signals with multichannel audio, but I didn’t think that this would, in the end, be a real issue.<\/p>\n

Well, yesterday I plugged a new Blu-ray player into my system. The signal was fed via a one metre Kordz cable, to a Kordz 5-way HDMI switchbox (the receiver I’m using doesn’t have HDMI switching), and thence via a 10 metre cable to a projector. Everything worked perfectly, even with a 1080p signal at 60 hertz.<\/p>\n

\"JaycarBut this afternoon I had to test the player with a same-brand high definition LCD TV, and it was more convenient to use a different HDMI cable to plug it in. I had a relatively inexpensive five metre one I had purchased a while back from Jaycar Electronics<\/a> that I had used many times with 1080i signals, perfectly successfully. But when I connected the Blu-ray player to the screen and tried delivering a 1080\/60p signal, the picture kept flashing bright white across the bottom, occasionally disappearing for an instant to be replaced by noise. The audio also dropped out.<\/p>\n

So I switched the BD player to 1080i output, and everything was fine. Back to 1080p, and the problem was again apparent. I then swapped the cable for a three metre cable of the same make (the code numbers on the cable’s insulation were identical) and this worked fine at 1080\/60p.<\/p>\n

So there you have it: cable quality is very important with HDMI. With a cheap cable, even five metres is too long for the high bandwidth demanded by 1080p\/60. The dot clock frequency for 1080\/60p video is 148.5MHz, which gives an idea of the bandwidth required.<\/p>\n

For the moment I’ll be sticking with Kordz cables.<\/p>\n","protected":false},"excerpt":{"rendered":"

A while back I mentioned how I’d found Australian interconnect company, Kordz, to be a very good deal for HDMI cables. I first stumbled across Kordz in an article in Connected Home Solutions (for which I write), which was discussing … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[26,41],"tags":[],"_links":{"self":[{"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/posts\/871"}],"collection":[{"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=871"}],"version-history":[{"count":4,"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/posts\/871\/revisions"}],"predecessor-version":[{"id":3206,"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/posts\/871\/revisions\/3206"}],"wp:attachment":[{"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=871"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=871"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=871"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}