[hpsdr] Pre-Distortion

[David R. Wilson]

Hi guys,

This idea was used in HDTV and HDRadio, and has been there now for a
number of years.  It is built into some of the more modern broadcast
transmitters.

It really works well.  I had the chance to be at a training seminar
at Harris about 8 years ago and saw this on the spectrum analyzer.

Once the switch was flipped for the system to optimize the spectrum and
clean up the mixing products, it took a few seconds.  Then the garbage
dropped by several DB (best I remember more than 10, could have been
more).

So, Yes.  This stuff is well worth the hassle.  For a HDTV station it
is very difficult to meet FCC requirements without it.

Dave
KU4B


On Sat, 2013-12-07 at 23:48 +0000, Jeff Cook wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Dear All,
> 
>  
> 
> At the risk of showing myself to be a complete plebeian, is there a
> discernible improvement that one can hear when using pre-distortion;
> or is this more of an esoteric exercise in design excellence? In other
> words is this an improvement that one can only detect using test
> equipment.
> 
>  
> 
> Jeff Cook, G0AFQ.
> 
> 
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