User's Manual

PINEAPPLE TECHNOLOGY, INC V.6 - ADAPTIVE PRE-CORRECTOR WEB SERVICE OPERATION
DXDPRO-10VH MODULATOR MANUAL
THE INFORMATION PROVIDED HEREIN IS PINEAPPLE TECHNOLOGY INCORPORATED PROPRIETARY INFORMATION AND
CANNOT BE COPIED OR DISTRIBUTED WITHOUT PRIOR AUTHORIZATION
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V.6 ADAPTIVE PRE-CORRECTOR WEB SERVICE OPERATION (Continued)
B. ELECTRICAL INTERFACE
2. Interface to the Transmitter
The non-linear sense input must be connected to a suitable coupler/tap-off at a point right after the power
amplifier before any band limiting filter. The linear sense input must be connected to a suitable
coupler/tap-off point after the channel filter. Notice further that the bandwidth between the RF output of
PT2160 and the input of the power amplifier must be at least 20MHz wide to ensure effective non-linear
pre-correction of the amplifiers non-linearity.
PTPT
C. OPERATION OF ADAPTIVE PRE-CORRECTOR
1. Connection and Verification of Signal Levels
The RF output and the sense inputs of the PT2000 Terrestrial Gateway unit must be connected as
described in above in V.6 - Adaptive Pre-Corrector Web Service Operation, Section B-Electrical Interface
on page 44. The graphical illustration of the two sense inputs in the web service block schematic will
appear in green color if the level is within the valid range for the respective input. If the level is marginal
relative to the required max/min limits the input will be shown in yellow color. If the level is outside the
valid range the input is shown in red color. For optimal result the corrector should only be operated with
input levels in the ‗green‘ state. Performance with ‗yellow‘ input state is not guaranteed. The adaptive pre-
corrector is not usable when the level is in the ‗red‘ state.
PT2160
Power
Amplifier
Channel
Filter
RF out
Sense-1
Non-Linear
Sense-2
Linear