Originally Posted by chocky909:
“I feel stupid asking, but can you explain this? How do you mean 'on the same multiplex'? I assumed if you had two tuners you could only watch a recorded program if you were recording two channels.
I've got a Thomson DHD4000 btw but I'm going to get a 250GB Toppy (I WILL use all the capacity (Richard46) and THEN delete stuff - record lot of films and watch them when I feel like it)”
Each anlogue channel uses one UHF Radio channel frequency
With Digital TV you can fit Multiple channels into one UHF Radio Frequency, this is called multiplexing, so a UHF radio channel that carries digital TV contains multiple digital Tv channels, this is a multiplex, or Mux for short
Inside the toppy there are Two UHF Tuners, each one can tune into two UHF frequencys (Mux's)carrying digital TV
as each mux contains multiple channels, it is possible for the toppy to record two channels simultaneoulsy, and display a thrid as long as its on the same multiplex as one of the chanels being recorded.
If your recording BBC1 and BBC3 at the same time, you will only tie up one tuner as BBC1 and BBC3 are on the same Mux, one tuner can handle that, leaving the other tuner free for displaying a channel from another Mux.
due to hardware limitations you can only record two channels at once, although you can record two channels and watch a recording.