Not sure what you mean here -- ATSC tuners by definition can only demodulate ATSC signals. To receive NTSC signals, you also need an NTSC tuner.ATSC tuners will receive both analog and digital channels.
I would be surprised if manufactures make TVs with NTSC tuners for much longer (if they still are).
Oops. I stand corrected.ATSC is a digital medium incapable of receiving analogue TV broadcasts.
Not true.Every Cable STB, Satelite RX, VCR, DVD player and Laserdisc player has a modulated NTSC output. Usually Ch 3 or 4, but a lot of newer ones are capable of many channels.
That will provide the worst possible video quality. Those devices should also have some video outputs. Even composite is better than RF and TV sets have had composite* inputs for years. Also, BDUs, such as Rogers, have a lobby channel, which can be used for that purpose.Every Cable STB, Satelite RX, VCR, DVD player and Laserdisc player has a modulated NTSC output.