[BC] HDTV

[Robert Meuser]

Frank:


That is an 80's vision of cable.  On my system, channels are delivered on 
channel and the picture is perfect. I live under 1/2 mile from the over the air 
TX site.

On another point, cable did not begin with 12 channels it began with channels 2 
to 6. High band came later.

R

FrankGott at aol.com wrote:
> In a message dated 2/8/2006 3:55:10 PM Eastern Standard Time, wa2mct at juno.com 
> writes:
> 
> << 
>  Who decides what channel position the local ends up at? Normally
>  different (on an analog cable system) from their over the air channel. 
>   >>
> Remember that cable began with just 12 channels.  Tradition dictates that the 
> over the air channels end up on the lowest number channels, those in the VHF 
> band.  They've remained there as cable systems upgrade their transmission 
> plant over the decades.  The lowest numbered channels are also the most basic 
> tiers offered.  So called "lifeline" cable for areas with poor over-the-air 
> reception.  The UHF stations are moved to the basic level giving all stations 
> parity.  
> 
> The channel numbers of the V's are moved to avoid herringbone and other 
> interference with the over the air signal.  That's also why there's a slight shift 
> in frequency from the air signals, hence the air/cable setting on modern TVs.  
> A loose connector can cause severe interference, what's known as ingress in 
> the industry.
> 
> Having broadcasters grouped makes sense.  Comcast groups similar channels 
> such as sports and news on the system here in Pittsburgh.
> 
> Frank Gottlieb
> cable guy in a previous life 
> 
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