Anywave PA-U-2200-D-FB Marble Snelstarthandleiding - Pagina 14

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10) Check the SNR and Shoulder (LIMD and UIMD) RF performance of your system

on the Exciter hi-level status screen, as well as the exciter's pages on the PA's

touchscreen as shown below. Linear and Non-Linear corrections were already

performed and optimized at a TPO of 2200W (before BPF, in ATSC 1.0) in the

factory and so the stored correction coefficients should produce good results.

If you are operating at a TPO less than rated power and wish to rerun corrections,

please proceed with the following steps, otherwise please skip ahead to step 12.

11) (Optional Step - Rerunning Corrections) If you are operating at reduced power and

wish to rerun corrections to achieve better performance, you may now perform

Linear and Non-Linear corrections. (Please refer to the Exciter User Manual for

detailed instructions on running corrections). Before running corrections, it is

important to verify proper feedback signal levels. There are two feedback signal

samples used to compute corrections. "RF IN A" (After BPF) is used to calculate

Linear correction coefficients while "RF IN B" (Before BPF) is used to compute

the Non-Linear correction coefficients.

12) (Optional Step) Navigate to the Exciter "DPD" submenu in the Advanced User

menu (simultaneously press Left and Right buttons, then simultaneously press Up

and Down buttons). Be sure the value of Feedback Sample Signal Input (FSSI) for

both A (after) and B (before) reads somewhere between 45% and 75% - which

roughly corresponds to a value of -15 to -5 dBm as measured on a power meter

(note: the FSSI indicator toggles between A and B and will "flash" when the signal

level is out of range, too high or too low). Add or remove the appropriate attenuator

padding to achieve feedback signal levels in the desired range. Note the AFTER

filter feedback sample is used to compute the SNR and Shoulder Metrics displayed.

13) (Optional Step) Navigate to the Exciter "SYSTEM" submenu and select UPDATE

under ADPC to run corrections. The exciter will then proceed through 4 stages of

correction, computing Linear and Non-Linear corrections, and automatically saving

the coefficients into non-volatile memory upon completion. The correction process

typically takes from 8-10 minutes to complete while real-time performance metrics

of SNR and Shoulder performance are displayed on the LCD.

14) Check RF Performance metrics (SNR, LIMD, UIMD) on the front panel screen of

the exciter.

Mable 8Device Quick Start Guide, 5/19/2022

Marble 8Device Quick Start Guide

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