Originally Posted by pcmm
2a power supply will power the pi but not the pi and a DVB-T. Even with a 2A power supply you'll see the little "lightening bolt" which indicates that there isn't enough amperage. a Pi 3b really needs a 3A power supply to be happy. Better to provide the DVB-T with additional external power.
Sorry, you are wrong. There are however many PS that don’t live up to the stated amperage but that is a different issue. A PS that actually delivers 2A is enough.
I manage a network of over 120 such units so I have quite a lot of data on this. Many of them have multible DVBT dongles and NONE of them require 3A supplies. With 2 or 3 dongles a 2.4A supply could be a good idea for MTBF optimization, but they will run on 2A as well.