[BC] Alternative action

[Phil Alexander]

On 3 Jun 2006 at 6:38, Rich Wood wrote:

> ------ At 03:09 AM 6/3/2006, Phil Alexander wrote:about WHYN -------
> 
> >Shouldn't have to worry too much about IBOC on that one.
> >The VSWR bandwidth probably is too narrow to get a decent
> >BER. Since it is CC, they will probably take a pass on this
> >one.
> 
> OK. Then what happens to them when we shut analog down? As I said 
> earlier, as soon as Car Talk is over we can do it today.

Catching up today. Sorry for the delay.

The answer to your question is they go on with full digital when
that day comes and stay analog until it does.

The full digital signal requires about the same b/w as the old
high quality analog, IOW a 30 kHz channel is more than enough
and it will probably fit in 20 kHz and work OK. I expect
experience and invention will narrow the b/w even further than
the specs in NRSC-5. The problem is the location of IBOC
primaries outside the analog segment of the envelope.

With peak SSB envelope equivalent to present analog power it
may become possible to drop one sideband, thus cutting the
b/w in half. None of this can be done while analog enjoys its
somewhat "protected" status. IOW everything in the hybrid
mode is a trade off and a very poor one at that. When analog
is finally gone - whenever that is - power can go up, b/w can
go down and most of the problems will go away. First we have
to get through the transition. Prices must come down and 
millions of sets must be purchased. Egg - chicken, chicken - 
egg. That is the problem the hybrid mode was meant to solve
but isn't doing a very good job of it. Car sets will lead the
way. The longer the transition takes the longer Ibiquity can
collect. However, the dilemma is the price point of home and
portable receivers. If Ibiquity is too greedy (and they are)
there is a chance they will stimulate reverse engineering of
their "trade secret" once it becomes interesting. Look what
happened to DTV a few years ago.


---------------------------------------------
Phil Alexander, CSRE, AMD
Broadcast Engineering Services and Technology 
(a Div. of Advanced Parts Corporation) 
Ph. (317) 335-2065   FAX (317) 335-9037





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