User Manual

PINEAPPLE TECHNOLOGY, INC. V. THEORY OF OPERATION
DTXPRO-1.2KU OPERATING AND SERVICE MANUAL
THE INFORMATION PROVIDED HEREIN IS PINEAPPLE TECHNOLOGY INCORPORATED PROPRIETARY INFORMATION AND
CANNOT BE COPIED OR DISTRIBUTED WITHOUT PRIOR AUTHORIZATION
V - 3
V -- THEORY OF OPERATION (Continued)
C. PS6KW 6 KW POWER SUPPLY ASSEMBLY FOR 50 VDC OPERATION
The DTXPRO-1.2KU transmitter is designed with over 6 KW of DC power. To achieve this level, the
power supply in each transmitter rack is made up of three (3) AC2050 power modules mounted into
one (1) main frame assembly, AC2009, which is capable of managing all three (3) 2 KW modules.
The power modules are "HOT PLUGGABLE" and can be removed or installed without turning off the
transmitter. A third power supply module can be purchased for added redundancy.
Each power supply module has OVER VOLTAGE, OVER CURRENT AND OVER TEMPERATURE
protection as well as a fault signal in the event of a failure.
REFER TO MANUFACTURER'S MANUAL FOR THE RRSI SERIES POWER SUPPLY PROVIDED
WITH THIS DTXPRO-1.2KU USERS MANUAL.
D. ADP500 PERFORMANCE MONITOR AND PAS SELECTOR SWITCH
The ADP500 Performance Monitor provides the following functions:
1. Provides device current monitoring of all the pallets used in the three (3) PA1K-50 power
amplifier assemblies. The current levels can be read directly from the multi-meter on the front
panel. Individual PA's and pallets are selectable on the ADP500 and PAS. In normal operation,
a PA FAULT is indicated when the LED goes from green to red. RED indicates that the current
level is below 500 mA and a transistor device may have failed. To read the actual current,
select the appropriate Power Amplifier (i.e.: PA1, PA2 or PA3) using the rotary switch on the
PAS. Then, using the rotary switch on the ADP500, rotate through the 5 PA positions to
measure the drain current on each transistor device for the selected power amplifier module.
The multi-meter will read the actual current.
2. A PA INHIBIT switch is provided for failure diagnostic purposes. When activated, this switch
allows the technician to monitor the bias currents for each pallet. These readings were
recorded at the factory and are found on the Transmitter Test Report, DC Test Report Section.
This is the best way to troubleshoot possible transistor problems. When in the PA INHIBIT
mode, the RF PWR OFF LED will change from green to red indicating that the "SHUTDOWN
LINE" is at TTL 0 state and the output power has been reduced to near zero.