[opendtv] Re: Zoran, Thomson team on digital TV reference design

  • From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Mon, 28 Nov 2005 15:24:23 -0800

Bert wrote:
>Without paying extra special attention to the front end, my
>sense is that A/74 gives you receivers which work well in
>most cases, but need window placement in the Schubin
>apartment.

I'm not aware that A74 played any roll in the design of this equipment.

-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]On
Behalf Of Manfredi, Albert E
Sent: Monday, November 28, 2005 3:07 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Zoran, Thomson team on digital TV reference design

Dale Kelly wrote:

> I, like Mark, was very involved in the A74 process.
> Let me be more direct; knowing what we knew at the time,
> the recommended practice was very marginal. Add to that
> the body of information contained in the studies
> published by Charley Rhodes, A74 is simply unsatisfactory.

Sounds like we need an A/74bis, which includes more
discussion of the analog front end itself. If the main
problem now is what Rhodes was analyzing.

Without paying extra special attention to the front end, my
sense is that A/74 gives you receivers which work well in
most cases, but need window placement in the Schubin
apartment.

Still, the unacceptably high sensitivity to pre-echo and to
antenna aim seem to have been solved with A/74.

Perhaps we really need both a tuned RF amp stage and dual
conversion IF, to solve the strong adjacent channel and
IM3 problems simultaneously.

Bert


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