On Tue, 11 Dec 2012 09:48:43 -0500, Francois Labreque wrote:

> Le 2012-12-06 12:32, Jim Henderson a écrit :
>> On Thu, 06 Dec 2012 09:37:04 -0500, Francois Labreque wrote:
>>
>>> That's why I said 10 years for HD.  And besides, digital channels take
>>> the same bandwidth spectrum as analog tv channels.
>>
>> IIRC, in the US at least, digital takes less spectrum.
>>
>>
> I thought analog channels were 6MHz wide as well, but couldn't find any
> actual numbers after a 3.5 nanosecond wiki search.

What I found in a quick search is that it's 6-8 MHz, and while analog and 
digital use the same amount of bandwidth (for "legacy reasons"), digital 
can have subchannels that analog doesn't.  So perhaps I should have said 
that the spectrum used is the same, but the usage is different and 
digital can be more efficient in using the bandwidth.

I think I might've been thinking about SSTV in HAM applications, because 
I knew there were gaps that could be used for (for example) regular FM 
transmissions within the channel's spectrum.

Jim

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