I found an old UHF TV at the thrift store today and I thought to myself, what not a better way to learn how NTSC works! Simple stuff relay. If you want to transmit using a HackRF or BladeRF all you need to do is encode a .dat file with a Python script, run it threw GRC, and boom, Bob's your uncle!
https://en.wikipedia.org/wiki/NTSC\
ttps://github.com/argilo/sdr-examples/tree/master/ntsc