Originally Posted by pachinko
From what I read in the various CM Q&As
, especially the "Channel & Signal Issues
", CM does not specifically mention multi-path issues, and believes most reception issues are related to antenna and cabling, including cabling for other devices too close to the DVR+ or its coax feed. They also believe that the DVR+ tuners are on par with TV tuners, sometimes not as good, and other times better. They also make the following statement (click HERE
for the complete statement), so firmware might be a solution.
Maybe I'm just in a grumpy mood this morning, or maybe I've just had it up to here with marketing and technical support bet hedging, issue ducking, obfuscation babble. But that's my reaction to the CM link.
Mass production fosters investment in high levels of (single chip) integration by semiconductor (integrated circuit) manufacturers, and that's great. At the board level the typical goal of the designer is to find as much technology as possible "off the shelf", and then design the remainder. I'll confess up front that I haven't surveyed the complete specifications of every ATSC chip manufacturer, but there are clearly multiple IC choices, and that means multiple board level design choices.
Google for "ATSC receiver integrated circuit ", and a host of familiar semiconductor manufactures and their products emerge. Some date back to 2005/2006 or so, some more recent. I find it highly unlikely that all board levels designs based such an array of choices will be equal. I submit there are an infinite number of ways to do things less than optimally.
One thing I'm pretty sure of is that the semiconductor technology most ideal for the 1st (front end) gain stage to achieve best possible noise factor is not likely to be the same technology most economical for the bajillion more transistors implementing all the complex functionality that follows. Also, I easily imagine there can be a variety of tactics and strategies taken for detecting, assessing, and compensating for phase issues (multipath) across the 6MHz spectrum of the transmitted signal.
From my own experiences, and from the countless anecdotes on this and other threads, a pattern clearly emerges. For me there is clearly an opportunity for performance improvement, and clearly there are existence proofs that better performance is possible.