Continental has worked closely with Nautel to modify the Nautel M50 adaptive precorrection for Continental's 816HD series transmitters.

 

Click here, or on the above graphic, to see a demonstration of Adaptive Pre-correction In Action. (requires Windows Media Player)

What you will see:
1) The first sweeps show an 816HD transmitter with no information in the precorrection look-up-table (LUT) and only minimal adjustments to IPA/PA matching and PA tuning and loading.
2) The transmitters is allowed to stabilize at full power for 4-5 seconds before the LUT is populated and precorrection is applied.
3) The Adaptive Precorrection quickly pulls in the analog and HD modulated carriers to meet the NRSC mask.
Note:

The Pavg sweep counter begins just after Adaptive Precorrection is applied. Sweeps are in real time through sweep 11, at which point they are displayed in a compressed time format to reduce the size of the video file.