Originally Posted by nahos81
Okay, so that's 3 people so far having this issue. Would it be presumptuous to say that there is an issue with WHDH rather than our computers?
More likely a case of both sides needing to be tweaked....
On the WHDH-DT side, the recent addition of "NBC Weather Plus," has changed the stream, and more-importantly the timing within the stream.
Getting a single feed to play on all the various STBs and tuner cards was tricky enough -- combining two feeds (audio, video, PSIP) into a 6 MHz channel takes it to another level of difficulty.
Let's see if we can do a quick checklist... (other "early adopters" please add your $0.02 and hopefully polish and make a "sticky".) Goal -- troubleshoot with idea of saving the user's sanity as well as properly communicating the issue with the broadcaster.
Broadcaster issues (i.e. are others with different STBs having the same issue?)
One channel or multiple channels?
if multiple channels,
is it the same network [e.g. WHDH & WJAR both are NBC and have NBC Weather Plus on a sub-channel), WGBH & WENH both are PBS and have their SD feeds on a subchannel]
if only one channel,
One program, or all programming?
if one program, may be a bad feed from the network.
if all programming, the broadcaster may need to "reboot"/adjust their encoder/PSIP generator/etc.
Reception issues (if problem is a single channel, all programming)
Is your analog reception ok? "Good Signal" -- not too strong, not too weak.
if not, best to adjust antenna for best possible analog UHF reception.
Does moving the antenna (via rotator or manually) change the behavior?
Do other STBs hooked up to the same antenna have the same issue?
Has there been rain lately -- connections may not be properly sealed
Seasonal - trees leafing out.
Summer vs winter troposphere issues.
Day vs Night propagation issues.
Is there ever a picture? (i.e. case of doesn't sync vs. breaks-up?)
Multipath... tricky since different STBs/tuner cards have different tolerances. [Macro-blocking, freezing, etc. are the classic signs of multipath.] On an analog TV, check if there are "ghosts" on any of the analog channels.
If ghosting noted on analog channels, try using an attenuator to see if that improves the problem. (Digital reception prefers minimal ghosting over maximum signal.)
STB/tuner card issue... (If reception is ok on another STB on the same antenna)
If issue is with a STB/tuner card issue, do others with the same model (and firmware version) have the same issue?
If yes (or unknown), report the make, model, firmware version to the engineering department of the broadcaster. Based on previous experience, applying factory updates to the broadcaster's encoder usually solves the problem. Why? because the encoder manufacturer is the one who can troubleshoot this kind of issue. The good news is that because this is a "can't sync up" issue, is often experienced by multiple stations, so it does get priority. When you bring the issue to the broadcaster's attention, please give them the make/model/etc. of the STB/tuner card along with the version of the firmware so they can pass it on the the encoder team.
If others not having the problem with the same card:
Does an earlier version of the firmware exhibit the same problem?
For tuner cards, does an earlier/later version/service pack exhibit the same problem?
Re-check for multipath.
When you think you've isolated the problem, search this thread/forum. Many of us have "been there/done that" and posted fixes/workarounds, etc.
We did what we had to do: "Chicken wire", "Voodoo attenuators", "Antenna lifters." We wanted our HDTV!
Lastly, when issue identified and/or resolved, POST!!!