[opendtv] Re: ATSC experience


John Golitsis wrote:
> This brings to mind a similar experience I've had in the past, but never 
> really thought to mention.  When I had my store, my tiny outdoor Terk yagi - 
> which was pointing straight at a metal hydro tower, which was in front of a 
> mid-rise apartment building - picked up Buffalo PBS best, but often times 
> during inclement weather, the main HD channel would fall to pieces, while 
> that station's SD sub-channels would be largely unaffected.  Before you 
> mentioned this, I suppose I thought a phenomenon like this would be largely 
> known, but perhpas not?
> 

Bert's comment was the first I'd heard about it anything like that.  I 
can offer no sensible explanation since they are both in the same data 
stream.  I don't believe sub-channels offer any special redundancy but 
maybe just having a frame take fewer packets is some sort of an advantage.

- Tom


> BTW...neither that channel's analog signal, nor any other Buffalo station's 
> analog signal were even remotely watchable with the same antenna.
> 
> ----- Original Message ----- 
> From: "Albert Manfredi" <bert22306@xxxxxxxxxxx>
> 
>>Even more interesting is that the SD weather multicast
>>on 11-2 is quite solid. Only a very occasional dropout or
>>slight pixellation. I suppose that if more packets per
>>unit time are required for the HD 11-1, and if the
>>corrupted packets are evenly spread out, maybe that's
>>why the SD subchannel appears more solid. Interesting
>>phenomenon. Perhaps you do gain from SD after all,
>>even without changing the RF coding.
>>
> 
> 
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