Back in the day, I remember a tv station (WCGV Ch. 24) here going off air at about 7pm or so and it made room for SelecTV to broadcast. We would have to turn on the SelecTV decoder box at a specific time to receive whatever code was necessary to watch movies that night. The code sent OTA had to agree with the code entered in the thumb wheels on the front of the decoder box. If we were late in "warming up the box" we didn't get to see movies that day.