Harris Constellation, Installation & Maintenance

Page: 44 / 292

Constellation™ November 2003
1-18 Introduction
ATPC Range
Constellation operates at one of two transmit output power levels: ATPC High
and ATPC Low. The levels are set during the calibration procedure to values
ranging between 2.5 dB and 10 dB.
•
The high power can be set as much as 7.5 dB below the rated power
•
The low power can be set as much as 10 dB below the rated power
•
The delta between high power and low power calibration settings must
be at least 2.5 dB
The radio can be operated at 10 dBm below the rated power by using the keypad
to calibrate “ATPC High” at rated power, calibrate “ATPC low” at 10 dB lower
than rated power, and then selecting “ATPC disabled low.”
Alternatively, the ATPC low setting can be calibrated between 2.5 dB and 10 dB
below rated power (ATPC High setting). So, the radio can operate at a value
between 2.5 dB and 10 dB below rated power by selecting “ATPC disabled low”
through the keypad.
Attenuation pads are required to operate at more than
10 dB below rated power
ATPC Functionality
With the ATPC feature enabled, the Transmitter Assembly operates at a
reduced power level output of 10 dB below nominal level during normal
operation.
When the RSL (Received Signal Level) at the far-end Receiver drops below a
predetermined threshold, a request for increased transmitter power is sent
upstream to the Transmitter. For a maximum of 5 minutes, the Transmitter
increases the output power to full power by approximately 10 dB.
When a fade condition no longer exists (or 5 minutes have passed), the
Transmitter will return to the reduced power level output of 10 dB below
nominal level.
ATPC can be enabled or disabled through the Keypad.