[opendtv] Re: From Broadcast Engineering - WRAL tests mobile DTV

  • From: "John Shutt" <shuttj@xxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Fri, 8 Aug 2008 19:21:35 -0400

8-VSB's threshold C/N ratio changes with the number of equalizer taps engaged to cancel out multipath.

In a challenging environment, the 3 dB 'advantage' of ATSC goes away.


----- Original Message ----- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>

The problem with comparing spectral efficiency, we should always
remember, is that it makes no sense at all to compare it UNLESS you
include the threshold C/N ratio required for solid reception. Without
the *two* numbers, you can take any position you want and rant about it.

So in this case, the comparison is that with a slight drop in b/s/Hz,
you are also saddled with a 3 dB increase in the required signal margin.

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