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 - 2
V. THEORY OF OPERATION
A. INTRODUCTION
The DTXPRO-1.2KU transmitter was designed to meet or exceed all FCC applicable specifications for
TV broadcast equipment. Special attention was given to the selection of sub-assemblies and
components to achieve maximum reliability and minimum down time. The construction of the
DTXPRO-1.2KU is BASIC and MODULAR with most subassemblies field replaceable. Special
emphasis was placed on "KEEPING IT SIMPLE" and returning to more traditional transmitter layouts
and instrumentation. Refer to the DTXPRO-1.2KU block diagram for an overview of the transmitter
architecture. This will give the technician basic information needed to understand the operation of the
transmitter and the function of each subassembly.
SEE SECTION (VI) FOR SUBASSEMBLIES AND BLOCK DIAGRAM.
B. ACDIS2 AC AND DC DISTRIBUTION
The ACDIS2 is the primary AC power inlet module. The DTXPRO-1.2KU transmitter was designed to
accept 208 to 240 VAC Single Phase using a four (4) wire connection. The four wires are:
--- 2 wires for 208 -240 VAC Single Phase
--- 1 wire for neutral connection
--- 1 wire for safety ground connection
CAUTION: Connection to the AC Primary source must be made using all four wires listed above.
Follow the wiring instruction given in TRANSMITTER INSTALLATION Section lll.3. If not followed,
severe damage to the transmitter and, or, electrical shock could result.
The ACDIS2 performs the following functions:
1. Provides a primary AC power breaker point to shutdown the transmitter
2. Provides 208-240 VAC power to each of the 2 KWDC power supplies with individual breaker points
for added safety.
3. Provides 110 VAC circuits for DXDPRO-10U, ADP500, ABS (as necessary) and AUX Power where
needed.
4. Analog metering is provided to monitor the Power Supply voltage and current being applied to the
RF Amplifier stages.
5. Power supply current sharing test points are provided for checking current sharing between power
supply modules.