3 ms·

I'm curious, why can't you get digital OTA TV? I haven't tried to use it myself.

JohnFen 3y ago
This is speculation, but I think that it has to do with the geography of the area. Digital TV is much pickier about line-of-sight, and there are large parts of my city where that doesn't exist to the broadcasting antenna.
- flyinghamster 3y ago
  Also, I wouldn't be surprised if it's more susceptible to multipath interference. Analog multipath leads to ghosting, but in the digital realm it might be too much for the ECC to handle. Analog degraded gracefully with distance, but digital works until it doesn't.
  - gabesk 3y ago
    As I understand it (and I'm not an expert just curious reader), it's part of what ATSC 3 is fixing by moving to OFDM instead of 8-VSB. Multipath in OFDM leads to some (hopefully few) number of subcarriers fading out, which error correction can manage. Conversely, 8-VSB is a regular single carrier (ish) (with 8 different analog signal levels, hence the name), so in order to decide the value of any bits at all the TV needs to identify and delay (line up) many of the ghosts up with the main signal. That's a more challenging signal processing task, especially given the diversity in age of the TV tuners (the ones from the late 2000's didn't have as advanced DSPs).
asveikau 3y ago
In addition to what others say in the thread, I think the range is worse than analog was.
vel0city 3y ago
1) Digital is pickier. You practically either have it or you don't. Too much signal noise and it's stuttering and compression artifacts where otherwise it would have potentially been a fuzzy but still probably understandable signal. 2) a lot of channels were reorganized with a lot of the VHF frequencies moved up into UHF. VHF tended to get a bit better penetration and range than UHF. I've noticed a decent bit of variance in quality of digital tuners. And as long as I could kinda point in the direction of the towers in the area I could get good signal.

This is speculation, but I think that it has to do with the geography of the area. Digital TV is much pickier about line-of-sight, and there are large parts of my city where that doesn't exist to the broadcasting antenna.

flyinghamster 3y ago
Also, I wouldn't be surprised if it's more susceptible to multipath interference. Analog multipath leads to ghosting, but in the digital realm it might be too much for the ECC to handle. Analog degraded gracefully with distance, but digital works until it doesn't.
- gabesk 3y ago
  As I understand it (and I'm not an expert just curious reader), it's part of what ATSC 3 is fixing by moving to OFDM instead of 8-VSB. Multipath in OFDM leads to some (hopefully few) number of subcarriers fading out, which error correction can manage. Conversely, 8-VSB is a regular single carrier (ish) (with 8 different analog signal levels, hence the name), so in order to decide the value of any bits at all the TV needs to identify and delay (line up) many of the ghosts up with the main signal. That's a more challenging signal processing task, especially given the diversity in age of the TV tuners (the ones from the late 2000's didn't have as advanced DSPs).

asveikau 3y ago

In addition to what others say in the thread, I think the range is worse than analog was.

vel0city 3y ago

1) Digital is pickier. You practically either have it or you don't. Too much signal noise and it's stuttering and compression artifacts where otherwise it would have potentially been a fuzzy but still probably understandable signal. 2) a lot of channels were reorganized with a lot of the VHF frequencies moved up into UHF. VHF tended to get a bit better penetration and range than UHF. I've noticed a decent bit of variance in quality of digital tuners. And as long as I could kinda point in the direction of the towers in the area I could get good signal.