|reply to blu87 |
Re: Signal problem again, I think
Thanks for the help, I've been trying to educate myself on these issues, but it's been hard finding websites that explain this sort of stuff.
Here's an update: I called Comcast Thursday morning and after 42 minutes and talking to four different people (one was totally dumbfounded), they finally determined that a tech needed to come out and check the box. I explained that I believed it was a signal issue, but they insist it's a problem with the box. An appointment has been set for a tech to come out.
Thursday night, I came home to find that the STB has stopped rebooting itself and was turned to channel 5. However, there was no picture and the message, "One Moment Please. This channel should be available shortly" was displayed. I turned the box off, I may have rebooted it and shortly thereafter, I finally got a picture on some channels. I checked the RF Statistics page and came across something that may be interesting which I have posted below.
Channel 110 - Science Channel (QAM Frequency 525.000 MHz)
Level: -19 dBmV
S/N: 0 dB when status is locked and 27 dB when status is unlocked
Power: 47 dBmV
Level: -23 dBmV (was -32 Wednesday)
S/N: 23 dB
Channel 110 (QAM Frequency 525.000 MHz)
Level: -10 dBmV
S/N: 35 dB
Power: 55 dBmV
Level: -16 dBmV
S/N: 22 dB
For the heck of it, here are the numbers from TV "1" on Thursday morning:
Level: -17 dBmV
S/N: 30 dB
Power: 44 dBmV
Level: -range dBmV (what does range mean?)
S/N: 22 dB
On TV "3", I'm noticing that most channels from 2 through 99 are not showing a picture. Channels with a QAM frequency in the 500s and 600s are showing a picture, but some of them have tiling. Frequencies in the 300s and 800s don't have a picture at all. Channel 110 (Science Channel, QAM Frequency 525.000 MHz) has a lot of tiling, whereas channel 119 (LMN, QAM Frequency 513.000 MHz) seems to be fine. I find that slightly intriguing because 119 is usually the channel that has the most tiling during bad weather when there's an area wide problem.
There are no splitters on the roof, but there is one in the attic. That splitter was replaced between 2004-2006 by a tech, and the original amplifier was installed in 2004. I spoke to a tech a while back who said the line for the upstairs TVs need replacing. I was planning on doing that in January after everything has settled from the holiday chaos.
So does anyone know why I'm now able to view some channels whereas on Wedneday and most of Thursday the signal was so low I couldn't even get a picture?
FDC is "Forward Data Channel" (from the headend to your STB) and RDC is "Reverse Data Channel" (from your STB back to the headend). Check this post for details on what these all mean/do: »Re: [DVR] cisco rng200n dvr
As far as the differences in reception for different channels close in frequency, a coax cabling/connections issue can cause problems at a certain frequency or range of frequencies. For digital channels, if the QAM carrier used to carry a particular channel happens to fall at that frequency/frequencies, then there could be issues for that channel [and any other channels carried on that QAM carrier(s)] while other channels, carried on carriers outside the problem frequency(ies) may be OK.
Replacing the splitters you can reach and that line for the upstairs TVs may resolve many of your issues.