[Phys-L] Re: TV delay

[Brian Whatcott <betwys1@SBCGLOBAL.NET>]

At 11:18 AM 6/7/2005, Laurent H., you wrote:
> My wife fairly frequently asks me about something she observed, and I can
> often start my explanation with "It's just simple physics . . . "
>
> The other day she asked me about something that sounded absurd, that I
> didn't think she was observing properly, but to my surprise, she was correct!
>
> We have a TV upstairs in our family room and another downstairs in our
> bedroom.  Our house is open enough that it is possible in some parts to
> hear both TVs at the same time.  Why, she asked me, are all the stations
> broadcasting simultaneously on both sets except for one, our local PBS
> station (Channel 11), which lags by a very noticeable second or so on one
> of the TVs?
>
> I didn't think this could be true, but it was.  Has anyone else ever
> noticed anything like this?  Let's hear your theory before I say anything
> more.


NPR stations use network feeds and they use local repeaters.
Sometimes you will find two versions of NPR material on
  closely adjacent channels (89.9 & 90.1 in my case)
A given station may include a delay loop if there is live material
to be interspersed.

   I take it that PBS TV may be similarly arranged.
So for me, the question would be: are two TVs really using the same signal?
It would be unusual to find an audio  delay source inside a TV
  (to say the least!)

But (reaching...) could one TV be recording to VCR
  and replaying in-line?


Brian Whatcott    Altus OK    Eureka!
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