Technical Manual
PINEAPPLE TECHNOLOGY, INC.
UTX3KW-A Operating and Service Manual
V— THEORY OF OPERATION
A. INTRODUCTION
The UTX3KW-A transmitter was designed to meet or exceed all FCC applicable specications 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 UTX3KW-A is BASIC
and MODULAR with most components eld replaceable. Special emphasis was placed on “KEEPING
IT SIMPLE” and returning to more traditional transmitter layouts and instrumentation.
This transmitter was designed for Analog (NTSC) transmission with provisions and options available to
convert to Digital Service when necessary.
Refer to the UTX3KW-A block diagram (page 15) for an overview of the transmitter architecture. This
will give the technician basic information needed to understand the operations of the transmitter and the
function of each subassembly.
SEE SECTION VI.A (Page 16) FOR PARTS LIST.
B. ACDIS3 AC DISTRIBUTION
The ACDIS3 is the primary AC power inlet module. The UTX3KW-A transmitter was designed to except
208 to 230 V AC 3-PHASE using a FIVE (5) wire connection. The ve wires are:
— 3 wires for 208-230V AC 3-Phase
— 1 wire for neutral connection
— 1 wire for safety ground connection
CAUTION: Connection to the AC Primary Source must be made using all ve wires listed above. Follow
the wiring instruction given in the AC WIRING (page 5; section III. 3.) If not followed, severe damage to
the transmitter and or electrical shock is possible.
The ACDIS3 performs the following functions:
1. Provides a primary AC power breaker point to shutdown the transmitter.
2. Provides 208 VAC power to each of the 2 KW DC power supplies with individual breaker points
for added safety.
3. Provides 110 VAC circuits for Modulator, ADP500, ABS (auxiliary power source), and AUX Power
where needed.
SEE SECTION VI.B (Page 17) FOR SCHEMATIC AND PARTS LIST
C. RR6000 POWER SUPPLY
The UTX3KW-A transmitter is designed with over 12 KW of DC power available to the transmitter. To
achieve this level, the power supply is made up of six (6) RR6000 power modules mounted into two (2)
main frame assemblies which are capable of managing three (3) 2 KW modules each.
The power modules are “HOT PLUGGABLE” and can be removed or installed without turning off the
transmitter.
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 PROVIDED WITH THE UTX3KW-A.
V — THEORY OF OPERATION
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