I just installed my new MDR515 DVR and having issues with just one channel, CBS which seems to be problematic for other users. I have read virtually all the threads regarding channel interference and have performed a few of the suggested remedies including "Map-Your-Own" and "Clean-Tuner" solutions. I even did a clear channel setup then manually added only the one channel that I know is CBS and the issue still exists. I also do not notice the tuner display flashing when surfing to 94.4.
Here are the major network channels how they appear in Fort Lauderdale, FL with straight Comcast cable (no STB):
ABC: 94.10 (MDR515 DVR), 86.411 (HDTV tuner), 411 (If a Comcast box were connected)
NBC: 100.6 (MDR515 DVR), 86.432 (HDTV tuner), 432 (If a Comcast box were connected)
CBS: 94.4 (MDR515 DVR), 85.433 (HDTV tuner), 433 (If a Comcast box were connected)
The problem is that sometimes CBS is broadcast on 94.4 as expected but other times it's replaced by a Spanish TV station. I have not noticed any discernible pattern, it happens during simple channel surfing without making any other setting adjustments on the device. And it seems more times than not on the Spanish station.
I'm pretty sure 94.4 is the correct DTV station as I have picked up the correct programming at times and I have not noted it on any other channel. I do get CBS on analog 4 which is not usable due to the low signal quality (I have since deleted all the analog stations using the clear channel setup.)
So I have two questions, why does CBS come and go and why does the MDR515 DTV channel mapping differ from the HDTV when the HDTV signal is sourced from the MDR515 pass-through cable feed.