User manual



Superior Broadcast

ATSC 3000 Exciter User Manual

Superior Broadcast ATSC 3000 Exciter

ATS C 3000 Exciter User Guide

Version 2.0 Page 10 of 13

10/23/2012

4 Connection

4.1 Connect the Transmitter

 Don’t turn on or off the exciter when the transmitter is running. The correct order is:

 First of all turn on the exciter.

 Measure the RF output level of the exciter to make sure it meets the requirement of the

transmitter input level. If the output level is out of range, change the parameter

"POWER" in "RF" sub-menu in control mode to make the adjustments. Refer to Table 7,

Chapter 3 for details. If the output signal level is within range, connect the exciter's

output (port [RF_OUT] on back panel) to the transmitter's input.

 After the exciter is stable, turn on the transmitter.

 Likewise, turn off the transmitter first before making any change to the exciter's settings.

Restart the transmitter after the exciter is stable again.

4.2 Start ADPC function

 After the exciter is connected to a transmitter, first of all measure the level of the transmitter's

output (both before and after band-pass filter). Make sure it meets the requirement of

exciter's feedback level (-30 dBm ~ 0 dBm and recommended range is -15 dBm to -5 dBm).

 If the signal level is out of range, use extra devices, e.g. attenuator, to make adjustments.

 If the signal level is within the range, connect the transmitter's output which is before

band-pass filter to port [RF_IN_B] and another output which is after band-pass filter to

port [RF_IN_A] respectively. Figure 1 below demonstrates the correct connection.

 Start ADPC function

 Select option "UPDATE" on "ADPC" of SYSTEM sub-menu in control mode. Save the

change, then all 3 parts of the ADPC process starts automatically in sequence, with tips

("Wait a moment...") and readings of "TSNR", "LID" and "UID" shown on LCD.

Usually it takes about 10 minutes to finish the total compensation of both the linear and

non-linear distortion in the whole transmission system including both power amplifier

and band-pass filter. Following each part, there is a "Saving" process which takes from

seconds to minutes to save necessary ADPC data into the on-board memory.

 Readings of "TSNR", "LID" and "UID" provide a continuous measurement and display

of quality of feedback signal during the ADPC process. Compare these readings before

and after the ADPC process as the reference of compensation performance. Restart or

abort the ADPC progress if compensation doesn't bring up a better signal quality.

 There is a "Loading" process if the exciter is turned on again or "HOLD" option is

selected. It mainly restores the ADPC data saved last time when an entire ADPC process

has been run successfully.

Note:

1) To monitor the entire process, connect the output of [RF_MON FEEDBACK] which is on

front panel) to equipment for measurement. The level of [RF_MON FEEDBACK] is about

11 dB lower than the feedback signal which is connected to port [RF_IN_A].

2) Do not change the connection status during the ADPC process otherwise it may affect the