signcarver wrote: ↑Thu Apr 23, 2020 12:41 pm
though wrote: ↑Thu Apr 23, 2020 10:19 am
How many different ATSC 3.0 channels will the new 4K Tuner be able to spit out simultaneously? Is it 2 or is it more?
According to the information at KS, it is currently 2 but they hope it to be 4 sub channels between the 2 ATSC 3.0 tuners (1.e. each tuner output up to 2 subchannels of the physical channel it tuned) ... most likely there will be ways to get the full mux (or even provide other filtering) by tuning the physical channel thus it "could" be more for some applications. Last I heard they expect each physical channel to be about 25Mbps but I have read that ATSC 3.0 could squeeze in 57Mbps per physical channel which with 2 tuners may end up being more than the 100Mbps ethernet port can handle.
ATSC 3 supports up to 4 PLPs per channel, and each PLP can use different modulations settings, so there's no straightforward answer of how much bandwidth any particular channel will have. A broadcaster could in theory use one PLP for a 4K broadcast of their main channel, which requires a better SNR than the typical 15dB that ATSC required (targeted at local viewers who get a great signal regardless of antenna, and more distant viewers with high quality antennas), a separate PLP with a 15dB SNR targeted signal (replicating their existing ATSC 1 coverage) for viewers in poor signal areas that perhaps carries the main service at 720p along with their SD subchannels, and maybe a third PLP targeted at even lower SNR for for mobile or other poor reception scenarios. That said, "about 25Mbps" is correct for a broadcaster using a single PLP at parameters set to replicate their ATSC 1 coverage. It's not a ton of extra capacity, but when combined with HEVC's massive improvement over MPEG2, it works out.
I would love for the possibility to record from a single tuner ABC, CBS, Fox, NBC, and PBS during prime time...
That's one neat feature that Dish Network has, but it also means putting up with the mediocre picture quality they have, not to mention their love of getting in carriage disputes with literally everyone. My antenna has never gotten into a carriage dispute with any broadcaster.