Technical Manual
PINEAPPLE TECHNOLOGY, INC.
UTX5KW-A Operating and Service Manual
V — THEORY OF OPERATION
A. INTRODUCTION
The UTX5KW-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 UTX5KW-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 UTX5KW-A block diagram – gure 1 (page 8) for an overview of the transmitter architecture.
SEE SECTION VI.A (page 14) FOR PARTS LIST
B. ACDIS5 AC DISTRIBUTION
The ACDIS5 is the primary AC power inlet module. The UTX5KW-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 SECTION (III. 3.; page 5), If not followed, severe damage
to the transmitter and or electrical shock is possible.
The ACDIS5 performs the following functions:
1. Provides a primary AC power breaker point to shutdown the transmitter.
2. Provides 208 VAC 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 backup power supply), and AUX
Power where needed.
4. Provides 208 VAC to power cooling and exhaust fans.
SEE SECTION VI.B (page 15) FOR SCHEMATIC AND PARTS LIST
C. RR6000 POWER SUPPLY
The UTX5KW-A transmitter is designed with over 18 KW of DC power available to the transmitter. To
achieve this level, the power supply is made up of nine (9) RR6000 power module mounted into three (3)
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 UTX5KW-A.
V — THEORY OF OPERATION
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