Sorry if I'm unclear but this is going to hurt.
I have had Comcast Extended (? one step above Basic, not digital) service for a number of years. I have one HDTV tuner, one analog PVR, and an analog TV.
From reading further, your HDTV seems to have a QAM tuner. This is good and you already seem to know how to use it.
Right or wrong, to make it easy I give the flawed analogy:
CATV=QAM and ATSC=Antenna
Comcast here in Portland changes the QAM lineup when it suits them, anywhere from 2-9 months. They don't support you watching through your QAM tuner and you should not expect any support that way.
Comcast has supposedly "upgraded" the San Francisco Peninsula to digital. I have received their digital conversion boxes, but have not hooked them up or activated them. My HDTV shows analog channels from 2 to 33.
These I assume are the Basic tier channels. Public Access, C-SPAN, Locals, Discovery, Shopping Channels
It also shows a large variety of digital channels with channel numbers that differ from their published ones. I also get Higher Definition for a number of local channels on strange channel numbers.
These would be the QAM channels
I don't want to run my PVR through Comcast's converter box. I can use its programming capability to record programs that come through on the analog channels. I do want to use Comcast's box on the analog TV to get the other channels. I don't know about using the box on the HDTV.
You seem to have it figured out except on the HDTV :up
1) Is Comcast expected to "drop the other shoe" and cut off the remaining analog signals?
No time frame has been given. When they shut off 33-71 here, we had 2 months warning. You should know ahead of time.
2) I have not activated the Comcast boxes. If I do activate a box and connect it to my analog TV, will Comcast do something to my feed that prevents my PVR from seeing the analog channels or prevents my HDTV from seeing all the channels that it currently sees? An other way of putting this is do all of the receivers need to go through the Comcast boxes once I activate?
2 parts to that question.
The first part on the analog PVR:
The
Comcast boxes DO NOT PASS-THROUGH the signal when in standby or off.
If you want to keep using the PVR on 2-33, don't bother hooking the cable box in between the wall and the PVR.
Part 2 on the HDTV:
I would get an HD box if they don't cost extra. If that's not the case, the options are ugly. I used a Standard Definition Motorola DCT-something via the composite cables for a while with a high-grade splitter that I got from a Comcast technician. I ran one cable to the TV and the other to the Cable box.
That would let you watch the Clear-QAM SD and HD via the TV tuner and still watch other stuff as well via the Cable box.
3) My HDTV shows a noticably poorer image on 720 and 1080i HD than it does for Blu-ray DVDs. People often look like they are using gobs of pancake makeup (in Photoshop I would liken this to edge sharpening with surface blur). Is this a characteristic of the program source or is Comcast playing games to reduce the bandwidth of its "HD" channels?
If the channel is available via an antenna, then by FCC mandate, it is the source.
Cable companies are barred from re-compressing the Over-The-Air channels on their cable systems.
Now as for all the cable channels, both the source and the cable company are to blame.
Here is where it gets technical, so I'll try to keep it simple.
What you need to take away from all the numbers is that they are sending a squeezed picture and having the cable box re-stretch it to 4x3 or 16x9 Aspect Ratio
Simply they are sending the following:
Almost EVERY digital SD channel on the Comcast system here is 512x480i
Analog TV, DVD and my OTA SD channels are 704x480i
720p OTA is 1280x720p
1080i OTA is 1920x1080i
Comcast HD is 3 formats I've seen. All are flagged widescreen.
1440x1080i
1920x1080i
1280x720p
Now the SD boxes will only put out 704x480i
512x480i => 704x480i
1280x720p => 1280x720p
1440x1080i => 1920x1080i
1920x1080i => 1920x1080i
Now I haven't even covered bitrates, and that's where it gets really bad.
This is how much information (I think of color) is allowed per picture.
Comcast SD here is 1.5 Megabits-per-second to 3 Megabits-per-second
Analog TV is generally recorded to a Hard Disk at 4Mbps
DVD has maximum video bitrate of 8 Mbps
Blu-ray supports a maximum video bitrate of 40 Mbps but nothing so far has gone above 25 Mbps last I checked
OTA HD can vary from 9 Mbps to 15 Mbps (ATSC supports a Max of 18 Mbps)
Cable HD channels I've seen vary from 7.5 to 15Mbps
What amount is minimum is an eye-of-the-beholder, Personally:
1080i still-shots with little-to-no-movement are fine with 11Mbps
1080i with movement need more than 15Mbps
720p needs everything it can get. 12Mbps
480i needs a minimum of 3Mbps for everything to look about new VHS quality
Mind you I like to be able to READ what is on screen even if it is only there for a second. That is where my standard is set.
I can't read what is on Comcast SD unless the letter/sign/note is on screen for more than 2 seconds in the center.
I am a new member and to do not recognize many of the abbreviations that the cognoscenti use here. Please be gentle.
Thanks,
Joe
Now some details I've glossed on but I hope this helps.
Please ask if there is anything more!