reply to Joe12345678
Re: [DTA] What DTAs is Comcast acquiring that are brand new Back before Comcast started setting HD as a separate code, my parents ancient SD boxes could receive the HD channels. It did tune them in and had audio, but no video. These were ancient DCT-2xxx's. I think newer ones may be able to tune them in and downconvert, if they are in the allowed channel mapping.
The reason why Thomson/Technicolor SD DTAs can tune to and downconvert an HD channel and output it at SD is because they use a Broadcom BCM3545 chipset. In this article on it »www.lightreading.com/document.as···d=161812 it says:
Broadcom's new [BCM3545] DTA chipset is based on the BCM3543 chip that's being used in some terrestrial, over-the-air [DTV] converter boxes.From a product brief I found on the BCM3543 chip, it states:
We took that [BCM3543 chip] at the core and basically cable-ized it...
On-chip support to convert all inputs (480i, 480p, 720p, 1080i) to standard definition analog output 480i format.
reply to andyross
I remember on of the SD boxes being able to view info channel HD when it was in the 480i looping help video mode. But what happens to the bandwidth it needs for HD. when it's is in 480i mode?
That bandwidth may be more or less fixed. It's a local channel, not national, so it could be anything. It may somewhat depend on what else is using that same frequency.