Originally Posted by gregdpw
if i dont use the box, i am loosing channels
Yes. You will lose all the channels that are part of expanded analog basic, channel 23 to around channel 80. If comcast doesn't scramble them then anybody who has a QAM decoder in their tv will get them for free.
The boxes comcast gave you are digital to analog converter boxes and they are for analog tvs not HDTVs. Any output on these type of boxes will be analog regardless of how they are hooked up.
They gave you the boxes because you only suscribe to analog expanded basic.
They are probably going to move the local HD channels into the analog basic channel package so you will probably only be able to get the analog basic lineup in the clear. They might leave the music choice channels in the clear also. If you want to get the expanded basic channels you will have to get a HD set top box from comcast or buy a moxi or tivo and get a cablecard for it.
For reference here is the physical analog basic RF channels in order from 54 MHz to 216MHz.
NOTE: Channel 1 is only 4MHz in size the rest is 6MHz in size.
NOTE: Channels 95,96,97 are the same frequencies as the FM radio band. So there is usually no tv channels put in this range because of ingress (noise) getting into these channels because of the strength of local FM radio stations.
Ingress will mainly occur in the customers home because of the use of bad, poor quality, outdated, or improper installation of wiring, F connectors, splitters, and cable amps.
From channel 23 to channel 135 (865 MHz), to 158 (1000MHz) are in order and are also 6 MHz in size.http://en.wikipedia.org/wiki/North_A...on_frequencieshttp://www.mastervideo.com/ntsc_chart.htm
Another benefit for comcast doing this is they can move most if not all of their channels below RF channel 80. This will eliminate a lot of truck rolls because of wiring related issues in the customers home. A lot of homes that are older have some very old coaxial wiring, splitters, and cable amps that only support about 500 Mhz to at most 600MHz.
My cable company is the oldest (62 years old) in the USA and this is a huge problem.
The only digital channels that are in the clear on my system are the digital copies of the analog basic line up, the music choice channels, Cspan, Cspan 2, NASA, the HD locals, and QVC HD. This is how its been for three years now.
I have an all digital line up for my cablecards since may of 2007. The only analog channel I have is the analog TVGOS host channel.