So... just chiming in to say, i too have noticed weirdness on the cable 
tv too... some channels are real bad... sometimes the picture freezes, 
or goes black, sometimes weird artifacts like mentioned before. I missed 
the last 10 minutes of mythbusters the other night :(

Jamie

On Fri, Mar 10, 2006 at 09:37:40AM -0800, Tony Newman wrote:
> Date: Fri, 10 Mar 2006 09:37:40 -0800
> From: Tony Newman <[EMAIL PROTECTED]>
> To: Eugene Unix and Gnu/Linux User Group <[email protected]>
> Subject: Re: [Eug-lug] Offtopic - Comcast "Digital Simulcast"
>       (DS)    image   quality
> 
> A few of the problems mentioned here might be due to "sun-out".  It 
> started around the first of March, and is getting near the end.  This 
> happens twice a year, and goes on for a few days.
> 
> What happens is from the receive dish's perspective, the Sun is right 
> behind the satellite it's trying to receive.  The electrical noise from 
> the Sun is stronger than the signal from the satellite and blocks the 
> signal.  This only lasts a few minutes each day, during the week or so 
> that everything is aligned just right (or just wrong).  The exact time 
> it happens depends on the position of the receive dish on the Earth's 
> surface, and the satellite's orbital position.  For analog receivers, 
> the picture gets progressively noisy, goes completely to noise, and then 
> slowly clears.  For a digital receiver, it may "pixelate" for a short 
> while, then blank out when the error rate goes higher than the decoder 
> can handle.
> 
> Of course this doesn't explain any long term quality problems.  Those 
> sound like the allowed bit rate for a channel is set a little too low.
> 
> -- 
> 
> Tony
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