[BC] WLS dead cxr prob. this a.m. at ~6:50

[Mike McCarthy]

I think that's what Warren is saying.  The RF falls low enough that the 
coding falls apart.  I have a link not far from his and I too periodically 
have fades.  My fade bank is over 30dB.  So I have a decent amount of room 
before I go to the back-up landline.

MM

At 07:45 AM 7/1/2006 -0500, Dave Dunsmoor wrote

> > It was a temperature inversion that scramble Harris 950 link CD Link
> > STL.  Over the
> > 25 mi path the coding scheme falls apart with this morning's
> > temperature inversion.  Its been
> > odd past few days with cool nights that drive this link into digital
> > fade.    RF level holds but the
> > modulation scheme falls apart.  Its must better that the formerly
> > used TFT DMM STL that was retired.
> >
> > Warren Shulz
> > WLS CGO
>
>
>RF level holds, and the (digital) modulation scheme fails? I am CERTAIN that
>you guys know far more about this than I do, but if I were taking a quiz,
>this
>answer would be #5 (out of 4 possible selections) for me.
>
>I could see the RF level dropping below a specified acceptable modulation
>recovery
>level, but I don't think I understand (yet) how the modulation scheme falls
>apart.
>
>Might it have to do with phenomena similar to multipath, and the receiver
>cannot accurately
>determine what to do with the scrambled bits?
>
>Please elaborate on the theory and practical application of this STL for me
>if you
>would, please.
>
>thanks,
>
>Dave Dunsmoor
>
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