It isn't something the user controls (other than "off" and "on"). DISH places the four HD locals feeds on the same transponder for each market and one tuner is aimed at that transponder during PTAT recording. The four feeds are recorded to hard drive where they are saved for a week for playback.
The system works on both EA and WA feeds ... but only the HD locals that it was designed to work with ... and only via the Hopper.
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