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Your TV has only a single tuner (as do most TVs on the market). You need a PVR with HDD usually sold with twin tuners, some have four. We have a Humax but prior to that had a TiVo, the latter which was the best PVR on the market until no longer supported in AU. With TiVo you continually had the last 30 minutes recorded on both tuners on whatever channel they were last set to even with the TV off.
Humax records the last 2 hours but only on the active tuner although 4 programs can be recorded (8 if on same broadcast channel frequency). Recording the last 30min or last 2 hours simply mans if you turn the TV on and realise a show is on you wanted to watch, simply press record and you’ll get the mast 2 hours with Humax. (Don’t change channel or you’ll reset the timer and lose the buffered program).
Panasonic make some nice PVRs too but their older ones now do not support some of the high definition broadcasts as they use a different codec.
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