Originally Posted by MrHT
Yes, that's my cable signal after it's split twice. If the internet is fine after being split twice, then I don't see why my HD cable is acting funky when it's only split once.
The HD box is hooked up via HDMI to the TV. But that can't be the issue because I use HDMI for my DVD & BD players and don't experience such issues. And the skip/pixellation & freezing frames only occur in about 10% of the channels. Some channels may have a brief skip once every hour and some may occur once every 20-30 minutes. NickHD is the worst as the frame will hang for a few seconds and then resume and it happens once every 5-7 minutes. But most HD channels which I watch often like TBS, E!, Discovery, AMC, etc. work perfectly fine. I guess a few channels just have weak signals but I'm not sure why.
Your modem downstream channel is RF channel 36 and your SD digital cable channels are probably on RF channel assignments below RF channel 90.
Your HD channels are probably on RF channel assignments above RF channel 100 to RF 135.
The channels that have the most drop outs is closer to RF channel 135 and the channels with the minor drop outs are probably in the RF 110 to 120 range.
The likely problem is with the feed coming from the distribution point in the basement of your building to your apartment on the 7th floor. You will have to find out from the apartment owner/owners who is responsible for the cable feed inside the building. The feed to your apartment can be older R59 cable or even damaged by rodents.
Another possibility is the whole distribution system needs to upgraded to handle the higher frequency channels.
You can try calling the cable company and see if they can send a tech out to check the signal strength and SNR of the higher frequency channels. They then can determine who will be responsible for the repairs/upgrades.
If you have a Motorola HD box you can check the signal quality using the diagnostics built into the box.
With the tv and box on ,tune to one of the bad channels, press the cable button then the power button, then quickly followed by pressing the ok/selct button. This will show the diagnostics.
Arrow down to the inband tuner and you will see the frequency of the channel in MHz and also the SNR of the channel. If the SNR is in the twenties and lower this will mean that there is a issues with the higher frequency channels.
You can use this chart to locate the RF channel assignment by its frequency in MHz:http://en.wikipedia.org/wiki/North_A...on_frequencies