Article View: aus.tv.digital
Article #656Re: Drongo goes Digital
From: Brad
Date: Fri, 27 Jan 2012 06:57
Date: Fri, 27 Jan 2012 06:57
19 lines
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2672 bytes
I think the new frequencies are actually channel centre, rather than Video Carrier frequencies as they were in the old analog(ue) system. The analog system consisted of several carriers with the sound sub-carriers nearer the top edge of the channel. The digital signals consist of many thousands of carriers and if you were to look at them on a spectrum analyser, you would see them all at the same strength. This means that you need an antenna with a reasonably flat response across the whole channel or you will lose data. The older 'metro' analog antennas were designed to cover up to Ch10, and that's about it. The gain, or sensitivity of the antenna rolled off rapidly above that. CH10 has moved up 1MHz and the two new digital channels above that are now being used. They will be received poorly by an old antenna. While detractors like to argue that there is no such thing as a 'digital antenna', there is a difference between an antenna designed to receive up to CH10, and one designed to pick up CH10, 11 & 12. http://en.wikipedia.org/wiki/Australasian_television_frequencies#Australia
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From: Brad <google2@vk2qq.com>
Newsgroups: aus.tv.digital
Subject: Re: Drongo goes Digital
Date: Thu, 26 Jan 2012 22:57:20 -0800 (PST)
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