Pineapple Technology VTX2KW-A Manuale utente
V T X 2 K W - A
INSTRUCTION MANUAL
SN:
PINEAPPLE TECHNOLOGY, INC.
DRAFT
PINEAPPLE TECHNOLOGY, INC.
VTX2KW-A Operating and Service Manual TABLE OF CONTENTS
Page 1
Section I — SAFETY NOTICES ........................................................................ 2
**READ THIS SECTION BEFORE INSTALLATION**
Section II — TRANSMITTER SPECIFICATIONS .............................................. 3
Section III — TRANSMITTER INSTALLATION ................................................. 5
Section IV — TRANSMITTER TURN-ON PROCEDURE .................................... 6
Section V — THEORY OF OPERATIONS
A. Introduction ............................................................................................................................7
B. ACDIS2 .. 7
C. AC2008 2KW Power Module ................................................................................................8
D. PAS10 and ADP500 Performance Monitor ............................................................................8
E. Remote Monitor and Control W/ABS ....................................................................................9
F. Modulator/Driver ..................................................................................................................10
G. VS500 4-Way Splitter ...........................................................................................................10
H. MFA1KW PA Mainframe Assembly ....................................................................................10
I. V600LDV2 Integrated Amplifier Assembly .........................................................................11
J. VC2KW-4 Power Combiner with Coupler ..........................................................................11
K. BPV2KW Band Pass FIlter ..................................................................................................11
Section VI — SCHEMATIC AND PARTS LISTS
A. VTX2KW-A .........................................................................................................................12
B. ACDIS2 14
C. MFA1KW .............................................................................................................................17
1. 1A0035 Status Board ........................................................................................................19
D. V600LDV2 ...........................................................................................................................21
1. VH200LD .........................................................................................................................23
2. 1A0025 Power Distribution and Monitor .........................................................................26
E. VS500 4-Way Splitter ...........................................................................................................28
F. VC2KW 4-Way Combiner ...................................................................................................29
G. PAS10 and ADP500 PA Monitor ..........................................................................................30
H. 1A5001/2 Isolator Assembly ................................................................................................40
Section VII — RECOMMENDED ROUTINE MAINTENANCE .......................... 42
Section VIII — ADJUSTMENTS AND TUNING .............................................. 43
Section IX — PROBLEM SOLVING / TROUBLE SHOOTING .......................... 45
Section X — WARRANTY .............................................................................. 47
Section XI — EXTENDED WARRANTY .......................................................... 48
PINEAPPLE TECHNOLOGY, INC.
VTX2KW-A Operating and Service Manual I — SAFETY NOTICES
I — SAFETY NOTICES
**READ THIS SECTION BEFORE INSTALLATION**
SEVERE ELECTRICAL SHOCK OR BURNS MAY OCCUR IF
THIS EQUIPMENT IS USED IMPROPERLY.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
NEVER WORK ON THIS EQUIPMENT ALONE. ALWAYS HAVE ANOTHER PERSON PRESENT
WHILE WORKING ON ELECTRICAL CIRCUITS OR MOVING EQUIPMENT. COMMUNICATIONS
TO EMERGENCY SERVICES SHOULD BE AVAILABLE AT ALL TIMES.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BEFORE CONNECTING THIS EQUIPMENT TO ANY AC ELECTRICAL SOURCE READ THE SEC-
TION ON INSTALLATION. ALL ELECTRICAL WIRING FOR THIS EQUIPMENT MUST BE PER-
FORMED BY QUALIFIED ELECTRICIANS. ALL WIRING MUST BE COMPLIANT WITH LOCAL
ELECTRICAL CODES.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
POWER AMPLIFIERS AND SUPPLIES ARE HEAVY. TO INSTALL THIS EQUIPMENT IN RACKS,
USE TWO (2) PERSONS TO AVOID POSSIBLE INJURIES.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
NEVER OPEN THE CABINET ENCLOSURE OR UNPLUG CABLES OR WIRES WHILE THIS
EQUIPMENT IS OPERATING.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ALL SERVICE WORK MUST BE PERFORMED BY QUALIFIED TECHNICIANS ONLY.
IF ONE IS NOT AVAILABLE LOCALLY, CONTACT PINEAPPLE TECHNOLOGY, INC. FOR
A LIST IN YOUR AREA.
Page 2
PINEAPPLE TECHNOLOGY, INC.
VTX2KW-A Operating and Service Manual II — VTX2KW-A SPECIFICATIONS
II — VTX2KWA SPECIFICATIONS
OPERATING
Power Output ...................................................... 2 KW Peak Sync
Aural Power ......................................................... 200 Watts
RF Output Impedance .......................................... 50 ohms
Operating Frequency Range ................................ Channel 7 thru 13 NTSC
Frequency Stability .............................................. 1 PPM or better
Harmonic and Spurious ....................................... -60 dB or better ref to P-sync
Power Consumption ............................................8 KW Maximum
AC Line Voltage .................................................. 208-240 V AC SINGLE PHASE
VIDEO PERFORMANCE
Visual Frequency Response ................................. +/- 1 dB across the TV Channel -1.25 MHz to 4.75 MHz
relative to visual carrier.
Differential Gain .................................................. <7 %
Differential Phase ................................................ <10 Degrees
ICPM ................................................................... <5 Degrees
Low Frequency Linearity .................................... <15 %
2T K Factor .......................................................... 3 %
Group Delay ........................................................ Meets FCC Part 73 rule
Video Input Impedance ........................................ 75 ohms
Video Input Level ................................................ 1 volt p-p
Variation of output power .................................... <5 %
Regulation of output power ................................. <5 % Typical
Video Signal to Noise Ratio ................................ < 45 dB un-weighted
THESE SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
Page 3
PINEAPPLE TECHNOLOGY, INC.
VTX2KW-A Operating and Service Manual II — VTX2KW-A SPECIFICATIONS
Page 4
AUDIO PERFORMANCE
Audio Response ................................................... Meets FCC Pre-emphasis Curves
Distortion ............................................................. <1 % THD
FM Noise ............................................................. 50 dB or better
AM Noise ............................................................ 40 dB or better
AM Synchronous Noise ...................................... 40 dB typical
Operating Temperature ........................................ -10 to +35 degrees Celsius Ambient
Altitude ................................................................ 5000 feet without additional cooling
Cooling requirements .......................................... Unobstructed Air flow of 2000 CFM
Minimum required at sea level with ambient
temperature of < 37 degrees Celsius
RF Output connectors .......................................... 7/8 EIA Flange
Weight .................................................................. 700 pounds est.
Dimensions .......................................................... 80” X 22” X 24” (H x W x L)
THESE SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
PINEAPPLE TECHNOLOGY, INC.
VTX2KW-A Operating and Service Manual
Page 5
III — TRANSMITTER INSTALLATION
To insure long and reliable trouble free service from the VTX2KWA transmitter the following steps for
installation are recommended.
1. MECHANICAL INSTALLATION: The VTX2KWA was designed to be installed in a building pro-
tected from the weather. The building should have a hard surface floor such as concrete with a mois-
ture barrier. This barrier could be pressure treated wood sub-flooring which could be anchored to the
concrete and to the transmitter to make the installation earth quake resistant.
Allow a minimum of three feet around the transmitter cabinet for service access. The top of the trans-
mitter should be clear for three feet to allow the air to exhaust from the transmitter.
Air flow thru the transmitter is approximately 2000 CFM. Provisions for air inlet and exhaust from the
room must allow air flow with minimal obstruction. In the event that the room temperature exceeds 35
degrees Celsius, cooling air must be provided so that the room temperature will not exceed 35 degrees
Celsius under worse case conditions.
Notice: This equipment is HEAVY and must be handled by professional movers with proper equipment.
Any damage caused by the installers is not covered under warranty. Check to insure that installing crews
have proper insurance coverage.
2. GROUNDING: Transmitter grounding is VERY IMPORTANT and must be done correctly for safety
and operational reasons. A typical installation may be done as follows:
Use a heavy gauge wire such as #2 AWG strained copper or solid copper buss 1 inch wide by 1/8 inch
thick for connections. The bonding between the transmitter and the ground rods must be good quality
and protected from corrosion. The ground wires should run over the floor and connected to the ground
rods located outside the building. The wire should not go thru the concrete floor but over and around it.
3. AC WIRING: A ten foot cable has been provided with the transmitter to facilitate the connection to the
AC Main power source. Connections to the AC Main should be made as follows:
RED and BLACK are connected to the 208-240 VAC SINGLE PHASE terminals
WHITE WIRE is connected to the NEUTRAL terminal
GREEN WIRE is connected to the SAFETY GROUND
NOTICE: All wiring of this type must be done by A QUALIFIED ELECTRICIAN and must conform
to LOCAL and NATIONAL Wiring CODES.
Consult with your electrician to insure that the proper breaker size is selected for the main circuit.
4. ANTENNA CONNECTION: The transmitter is equipped with a 7/8 EIA Flange connector located at
the top of the rack. Connecting the transmitter to the antenna must be performed by qualified person-
nel. Conditions vary from site to site so some engineering may be required to insure that the antenna is
receiving the correct amount of power to comply with FCC licenses and to insure safety from lighting
etc.
III — TRANSMITTER INSTALLATION
PINEAPPLE TECHNOLOGY, INC.
VTX2KW-A Operating and Service Manual IV — TRANSMITTER TURN-ON PROCEDURE
Page 6
IV — TRANSMITTER TURN-ON PROCEDURE
Before applying AC Power to the transmitter for initial turn on and check out, the installation should be
approved by a qualified broadcast engineer. The Turn on procedure that follows is recommended by Pine-
apple Technology, Inc. engineering staff:
1. Check transmitter load or antenna for proper installation and connection to the transmitter.
2. Open the transmitter and inspect all cables and wires for lose connections or broken wires in the
rack assembly
3. Check for damage to the equipment mounted in the rack.
4. Check all AC breakers and on/off switches to ensure that all are OFF.
5. TURN ON THE MAIN AC BREAKER LOCATED IN THE SUB-PANEL WHERE THE AC POWER
CORD WAS CONNECTED.
6. TURN ON THE MAIN AC BREAKER LOCATED ON THE ACDIS2 POWER DISTRIBUTION
PANEL LOCATED ON THE FRONT OF THE TRANSMITTER. A GREEN LIGHT SHOULD
COME ONE INDICATING POWER IS ON.
7. TURN ON THE AC SWITCH LOCATED ON THE FRONT OF THE ADP500. THE INDICATING
LIGHTS SHOULD BE ON AND READY FOR OPERATION
8. TURN ON THE AUX BREAKER LOCATED ON THE ACDIS2 FRONT PANEL. THE PA FANS
AND THE RACK EXHAUST FANS SHOULD COME ON.
9. TURN ON THE POWER SUPPLY BREAKERS LOCATED ON THE FRONT OF THE ACDIS2.
CHECK THE AC 2008 POWER MODULES (6) EACH TO SEE IF THE GREEN LIGHTS ARE
INDICATING NORMAL OPERATION.
10. USING THE ADP500 & PAS10 CHECK THE IDLING CURRENTS ON EACH PA TO ENSURE
THAT THE CURRENTS ARE IN THE CORRECT RANGE. TYPICAL RANGE IS 1.5 TO 2.5
AMPS. SEE ADP500 OPERATING SECTION FOR DETAILS
NOTICE: The Modulator/driver has been set at the factory so that the output power indication on the
ADP500 will show 100% or 2 KW p-sync power level. It is important to read the instruction manual sup-
plied with the modulator to locate key adjustment devices on the front panel. The output level adjustment
will be necessary for the next step in the turn on procedure.
11. Locate the level adjustment on the modulator/drive and turn the level down to minimum or CCW.
12. Turn on the power switch located on the modulator/up-converter rear panel.
13. Apply a video signal (1 volt P-P) to the video input terminal
14. Slowly increase the output level adjustment while watching the RF Output level on the
ADP500 until it reads to 50%.
PINEAPPLE TECHNOLOGY, INC.
VTX2KW-A Operating and Service Manual
15. Using the ADP500 reflected power indication check the LOAD reflected power. This should be less
that 5% reflected.
16. Return to the PA current readings on the ADP500 to verify that all the currents are approximately
the same.
17. With successful performance to step 17, the transmitter output power can be increased using the
output level adjustment on the modulator to achieve 100%. The aural power can be added at this time
not exceeding 10% of output p-sync power as indicated on the ADP500.
V — THEORY OF OPERATIONS
A. INTRODUCTION
The VTX2KWA 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 VTX2KWA 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.
This transmitter was designed for Analog (NTSC) transmission with provisions and options available to
convert to Digital Service when necessary.
Refer to the VTX2KWA block diagram (page 12) for an overview of the transmitter architecture. The key
subassemblies are listed below followed by a brief description. This will give the technician basic infor-
mation needed to understand the operations of the transmitter and the function of each subassembly.
SEE SECTION VI.A FOR PARTS LIST (page 13)
B. ACDIS2 AC & DC DISTRIBUTION
The ACDIS2 is the primary AC power inlet module. The VTX2KWA transmitter was designed to except
208 to 240 V AC SINGLE PHASE using a FOUR (4) wire connection. The four wires are
2 wires for 208-240V AC 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 the AC WIRING section III. 3 (page 5). If not followed, severe
damage to the transmitter and or electrical shock is possible.
The ACDIS2 performs the following functions:
1. Provides a primary AC power breaker point to shutdown the transmitter.
2. Provides 208 VAC single phase 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, Auxiliary Power Source, and AUX Power where
needed.
V — THEORY OF OPERATIONS
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PINEAPPLE TECHNOLOGY, INC.
VTX2KW-A Operating and Service Manual
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.
SEE SECTION VI.B FOR SCHEMATIC AND PARTS LIST (page 14)
C. AC2008 2 KW POWER MODULE
The VTX2KWA transmitter is designed with over 8 KW of DC power available to the transmitter. To
achieve this level, the power supply is made up of four RR6000 (PTI P/N AC2008) power module
mounted into TWO mainframe assemblies RU2 (PTI P/N AC2009) which are capable of managing three
2 KW modules each.
The power modules are “HOT PLUGGABLE” and can be removed or installed without turning off the
transmitter.
Each power supply modules 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 VTX2KWA.
D. PAS10 & ADP500 PERFORMANCE MONITOR
The PAS10 & ADP500 PERFORMANCE MONITOR provides the following functions:
1. Monitors FORWARD AND REFLECTED POWER to the antenna and presents it as a percentage of
power rating. The transmitter comes set to 100% P-Sync power based on the ratings of the transmitter.
2. Monitors Aural Power as a percentage of P-Sync rating (10 % typical)
3. Provides a HIGH ANTENNA VSWR MONITOR In the event of an antenna or coax failure where the
reflected power exceeds 25% the transmitter will shutdown. Front panel LED with change from green
to red in case of a fault.
4. Provides current monitoring of all the pallets used in the six V600LDV2 power amplifier assemblies.
The current levels can be read directly from the multi-meter on the front panel. Individual pallets are
selectable on the ADP500 and the PA assemblies are selected using the PAS10. In normal operations, a
PA FAULT is indicated by going from green to red. RED indicates that the current level is below 500
ma and a transistor could have failed. To read the actual current, select the appropriate PA Bank using
the PAS10. The ADP500 will now display status of each pallet in that PA. The multi-meter will read
the actual current.
5. 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 should be recorded when the
transmitter is first installed and used as a reference. This is the best way to trouble shoot possible tran-
sistor 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 a TTL 0 state and the output power has been reduced to
near zero.
6. An RF MONITOR port (BNC) is available to connect a spectrum analyzer or other test equipment for
monitoring the output signal.
V — THEORY OF OPERATION
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PINEAPPLE TECHNOLOGY, INC.
VTX2KW-A Operating and Service Manual V — THEORY OF OPERATION
Page 9
THE METER SELECTOR SWITCHES
The PAS10 is used to select the appropriate PA Module (V600LDV2) for performance display on the ADP500. PA
designations are PA1 starting from the top row going left to right with PA4 being on the right side in the second
row down when viewed from the front of the transmitter.
The Rotor Switch on the ADP500 is the detail selector for the multi-meter. The various positions are defined as
follows:
PA1 THRU PA5 ................................................... Reads PA pallet currents as selected
Typical reading in INHIBIT MODE 1.5 TO 2.2 A
Typical reading 5-7 A for PA1-PA4 with normal picture or 50% APL test waveform
Typical reading 2-3 A for PA5 with normal picture or 50% APL test waveform
PA6 ..................................................................... NO CONNECTION
PS VOLTS ........................................................... Reads DC Voltage applied to PA Stages
Typical reading would be +29 to 32 VDC
P FWRD ............................................................... Reads PA output power in P-Sync percentage of rating.
Full power reading would be 100%
P RFLD ................................................................ Reads PA output power being returned from the load and
displayed as a percentage of forward power.
Typical reading would be < 5% indicated.
P AURAL ............................................................. Reads the AURAL POWER component as a percentage of
forward power. Typical reading would be 10%
AUX 1 & AUX 2 ................................................. not used in this configuration
REFER TO SECTION VI.H. FOR SCHEMATICS AND PARTS LIST (page 33)
E. REMOTE MONITOR AND CONTROL WITH ABS
This equipment is OPTIONAL and may be required to ensure remote control operational capability.
The Remote Monitor is used to monitor the operational status of the transmitter and will allow the operator to turn
RF on or off and adjust power levels. The following items are monitored or controlled:
1. Transmitter on/off function
2. Power output level monitor and adjustment.
3. AC Line voltage status. With ABS you can be notified if there is a power failure at the side.
4. Various other custom options are available. Specify these at the time the transmitter is purchased and they will
be included if possible.
Remote monitoring requires a Phone line connection. Information can be accessed via a PC Terminal or via a
‘VOICE COMMAND LINE’. Either option is standard with this system.
The Auxiliary power unit requires a battery connection. A common car battery (12 VDC) can be used with a char-
ger as an ABS. This will run the Monitor and provide access to transmitter status for several hours.
Indice
