HDTV Forum

I have Comcast cable in my house. I've had it for over 20 years. I also have DirecTV so my main source is satellite. I have a Sony 60" SXRD and a Sony Bravia 32" LCD tv. Each one has a QAM tuner which allows me to tune unscrambled digital signals coming in through the Comcast cable. I can receive local digital channels including High Definition. There are a few others like TNT-HD. The odd thing about this is the two tv's decode the channels to different channels! An example: local CBS on the LCD Bravia is located at 1.1 and on the SXRD at channel 103.1. Local PBS (PBS-HD) on the Bravia is located at 1.3 and on the SXRD at channel 101.3. I cannot receive local NBC on the Bravia but I can on the SXRD. This is all on the same wire coming into the house!

It appears there may be different protocalls for QAM. I thought that would have been a standard that all manufactures would have to use. My situation is with the same manufacture. Does anyone have any comments or experience with QAM tuners?

Being that they are both Sony have you called them? Ask about a firmware update...

I know that there is no standardized way of presenting the channel information. Dash nubers are another popular choice eg. 4-1, 7-1 Etc. I have a Sony with a QAM tuner. The designators I get use the analog channel followed by .1 for the HD version, and then .2, .3, .4 for any SD subchannels. For example, my local analog NBC is on ch. 4. My HD comes out as 4.1, and I get three SD subchannels designated 4.2, 4.3 and 4.4. In addition, for some reason, I get the HD signals again in a 25.X series. If I use my cable box, I get no subchannels, and the HD stuff is 7XX. NBC HD would be 704, for example.