User's Manual

PINEAPPLE TECHNOLOGY, INC VII. DTXPRO-800VH THEORY OF OPERATION
DTXPRO-800VH OPERATING AND SERVICE MANUAL
THE INFORMATION PROVIDED HEREIN IS PINEAPPLE TECHNOLOGY INCORPORATED PROPRIETARY INFORMATION AND
CANNOT BE COPIED OR DISTRIBUTED WITHOUT PRIOR AUTHORIZATION
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VII. DTXPRO-800VH THEORY OF OPERATION
A. INTRODUCTION
The DTXPRO-800VH 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-800VH is BASIC and MODULAR with most components field
replaceable. Special emphasis was placed on "KEEPING IT SIMPLE" and returning to more
traditional transmitter layouts and instrumentation. Refer to the DTXPRO-800VH 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.
B. ACDIS1 AC AND DC DISTRIBUTION
The ACDIS1 is the primary AC power inlet module. The DTXPRO-800VH 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 ACDIS1 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 Exciter, ADP1000, and AUX Power where needed.
4. Analog metering is provided to monitor the Power Supply voltage and current being applied to
the RF Amplifier states.
5. Power supply current sharing test points are provided for checking current sharing between
power supply modules.