Pineapple Technology LTX100U 100 WATT TV ANALOG BROADCAST TRANSMITTER User Manual

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Date Submitted	2007-03-19 00:00:00
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Creation Date	2007-02-06 13:22:15
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LTX100U/VH/VL TRANSMITTERS
INSTRUCTION MANUAL
PINEAPPLE TECHNOLOGY, INC
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VH/VL Operating and Service Manual
TABLE OF CONTENTS
Section l --- SAFETY NOTICES ………………………………………………………………………… 2
** READ THIS SECTION BEFORE INSTALLATON **
Secton ll --- TRANSMITTER SPECIFICATIONS …………………...…………………………………
Section lll --- TRANSMITTER INSTALLATION ………………………………………………………
Section lV --- TRANSMITTER TURN-ON ……………………………………………………………… 6
Section V --- THEORY OF OPERATION
A. Introduction ………………………………………………………………………………
B. MA1000 Modulator…………………………………………………………………………
C. LTX Mainframe Assembly ………………………………………………………………
D. BPU150/BPLV750/BPHV750 Broadband Filter…………………………………………
SECTION Vl --- SCHEMATIC AND PARTS LISTS
A. LTX100U/VH/VL…………………………………………………………....................... 10
B. LTX Mainframe Assembly………………………………………………………………… 14
C. BPU150/BPLV750/BPHV750 Broadband Filter………………………………………… 21
SECTION Vll --- RECOMMENDED ROUTINE MAINTENANCE …………………………………… 23
SECTION Vlll --- ADJUSTMENTS AND TUNING ……………………………………………………
24
SECTION lX --- PROBLEM SOLVING / TROUBLESHOOTING …………………………………… 25
SECTION X --- WARRANTY ……………………………………………………………………………
27
Section I
Safety
Notices
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VH/VL Operating and Service Manual
l --- SAFETY NOTICES
l ---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
SECTION ON INSTALLATION. ALL ELECTRICAL WIRING FOR THIS EQUIPMENT MUST BE
PERFORMED 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
Section II
Transmitter
Specifications
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VL/VH Operating and Service Manual
II – TRANSMITTER SPECIFICATIONS
II – LTX100U/VL/VH SPECIFICATIONS
OPERATING
Power Output ………………………… 100 Watts P-Sync
5 Watts Aural
RF Output Impedance………………… 50 ohms
Frequency Range
LTX100U……………………...470 – 806 MHz
LTX100VL…………………….CH 2 – CH 6
LTX100VH……………….……CH7 – CH13
Frequency Stability…………………… 1 PPM or better
Harmonic and Spurious………………... -50 db
Power Consumption…………………… 500W maximum
AC Line Voltage……………………… 85 – 120 VAC 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%
Low Frequency Linearity………………….. < 15%
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.
LTX100U/VL/VH Operating and Service Manual
II – TRANSMITTER SPECIFICATIONS
AUDIO PERFORMANCE
Audio Response…………….…………. Meets FCC Pre-emphasis curve
Distortion…………………………………….< 1% THD
FM Noise…………………………............... < 50 dB or better
AM Noise……………………………………< 40 dB or better
AM Synchronous Noise……………………. < 40 dB typical
GENERAL
Operating Temperature…………………….. -10 to +35 Degrees Celsius Ambient
+14 to +95 Degrees Fahrenheit Ambient
Altitude…………………………………….. 5,000 ft without additional cooling
Cooling Requirement………………………. Built in, except where noted
Connectors…………………………………..BNC Connector Input, N Connector Output
Weight………………………………………100 lbs
Dimensions Overall…………………………21” x 25” x 24” (W x H x D) Standard
THESE SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
Page 4
Section III
Transmitter
Installation
PINEAPPLE TECHNOLOGY, INC.
LTX100U/LV/LH Operating and Service Manual
lll -- TRANSMITTER INSTALLATION
lll -- TRANSMITTER INSTALLATION
To ensure long and reliable trouble-free service from the LTX100U/LV/LH transmitters the following steps
for installation are recommended:
1.
MECHANICAL INSTALLATION: The LTX100U/LV/LH transmitters were designed to be installed in
a building protected from the weather. The building should have a hard-surface floor such as
concrete with a moisture 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 earthquake
resistant. For ease of operation and maintenance, the transmitter cabinet will need to be securely
mounted to a raised structure at some appropriate distance above the floor.
Provisions for air inlet and exhaust from the room must allow air flow with minimal obstruction.
In the event that the room temperature exceeds 35º Celsius (95º F), 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 ensure
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 16 AWG stranded copper. 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 be connected to the ground rods located outside the building. The wire
should not go through the concrete floor but over and around it.
3.
AC WIRING: The LTX100U/LV/HV transmitters come with a three wire 110 VAC standard plug for
connection to a 110 VAC electrical outlet. It is recommended that the electrical outlet be protected
with its own separate breaker and used only for the transmitter.
NOTICE: All wiring of this type, except for the actual connection to the AC plug, must be done
by a QUALIFIED ELECTRICIAN and must conform to LOCAL and NATIONAL wiring CODES.
Consult with your electrician to ensure that the proper breaker size is selected for the main circuit.
4.
ANTENNA CONNECTION: The transmitters are equipped with an N connector for output power
to the transmit antenna and an F connector for connection from the receive antenna.
Page 5
Section IV
Transmitter
Turn-On
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VL/VH Operating and Service Manual
lV -- TRANSMITTER TURN-ON PROCEDURE
lV --- TRANSMITTER TURN-ON PROCEDURE (Page 1 of 2)
See the previous section on installation before proceeding with this section. Improper installation of the
transmitter can cause serious damage to the equipment or operating personnel and may void
manufacturers warranty. Initial turn on and check out is very important for the broadcast engineer to
learn how to setup and operate the transmitter. Following these steps will ensure long and reliable operation:
1.
Check the transmitter output load or antenna for proper installation and connection to the transmitter.
2.
Inspect the transmitter front and back to check for broken items or lose fitting items. These must
be replaced or properly secured before turning the transmitter on. Pay special attention to all RF
connectors including transmit coaxial cable and antenna.
3.
Check the AC breaker and on/off switches to ensure that all are in the OFF position.
4.
Verify the switch on the power strip at the back of the cabinet and the power switch on the front of the
LTX Mainframe are in the OFF position. Plug in the AC power cord to a nearby 110 AC electrical
connector with associated, appropriately sized, circuit breaker.
5.
On the MA1000 Modulator, turn the Output Power potentiometer fully counter clockwise to minimum.
6.
Turn-on the AC Power switch located on the power strip at the rear of the LTX100U/VL/VH cabinet.
7.
Locate and turn on the front panel breaker found on the LTX Mainframe and set the XMTR switch
to the ON position.
MAKE THE FOLLOWING OBSERVATIONS
METER READINGS
TYPICAL
DC SUPPLY VOLTAGE
32 VDC
PA1 DRIVER CURRENT
1.7 AMPS ± 20%
PA2 FINAL CURRENT
2.7 AMPS ± 20%
PA3 FINAL CURRENT
1.3 AMPS ± 20%
RF OUTPUT POWER
10 TO 50%
RFL'D POWER
< 10%
NOTE STATUS LIGHTS
FAN
GREEN
TEMP
GREEN
+DC
GREEN
THE FAN SHOULD BE MAKING SOME NOISE
Page 6
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VL/VH Operating and Service Manual
lV -- TRANSMITTER TURN-ON PROCEDURE
lV --- TRANSMITTER TURN-ON PROCEDURE (Page 2 of 2)
Note: Allow the LTX100U/VL/VH to warm up for at least one (1) hour before making the final adjustment.
If transmitter is not warmed up, the output power will require re-adjustment to proper level when it is warm.
8.
Select the FWD Power setting on the rotary switch associated with the front panel meter on the LTX
Mainframe assembly. Slowly adjust the Output Level setting on the MA1000 Modulator while observing the
output power level on the front panel meter until the meter reading indicates 50% output power. At this
point, check the reflected power indication on the LTX meter. The reading should be less than 5% if the
output connection, cable and antenna have been previously verified to have a VSWR of less than 1.2:1.
9.
If the output level is stable at the 50% point for 5 or 10 minutes, it is OK to increase the drive to achieve
a reading of 100%. This is the output level set at the factory for your transmitter and is p-sync reading.
RECORD AND RETAIN THE FOLLOWING OBSERVATIONS FOR FUTURE REVIEW IF NECESSARY
METER READINGS
TYPICAL
DC SUPPLY VOLTAGE
32 VDC
PA1 DRIVER CURRENT
1.8 AMPS ± 20%
PA2 FINAL CURRENT
3.4 AMPS ± 20%
PA3 FINAL CURRENT
2.8 AMPS ± 20%
RF OUTPUT POWER
90 TO 100%
RFL'D POWER
< 10%
NOTE STATUS LIGHTS
10.
FAN
GREEN
TEMP
GREEN
+DC
GREEN
Check the transmitter on-the-air signal with a monitor to ensure all is well and you're done.
Page 7
Section V
Theory
of
Operation
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VL/VH Operating and Service Manual
V -- THEORY OF OPERATION
V --- THEORY OF OPERATION (Page 1 of 2)
A. INTRODUCTION
The LTX100U/VL/VH series transmitters were 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 LTX100U/VL/VH is
BASIC and MODULAR with most components are field replaceable. Special emphasis was placed on
"KEEPING IT SIMPLE" and returning to more traditional transmitter layouts and instrumentation.
Refer to the LTX100U/VL/VH 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 Vl.A FOR PARTS LIST AND BLOCK DIAGRAM.
B. MA1000 Modulator/Exciter
The modulator/exciter is set up at the factory for the operating frequency (Channel) specified by the
customer as shown on the appropriate FCC document including any appropriate offset.
Refer to the Cadco user manual at the end of this manual for information on the modulator.
C. LTX100( ) Mainframe Power Amplifier
Cabinet - The cabinet is constructed of heavy gauge steel and is very durable. This enclosure is
painted black and is resistive to harsh environment. Standard 19 inch rack mounting.
The LTX100( ) Mainframe is the power amplifier assembly that accepts the video and audio signal
from the modulator/exciter and raises it up to the required output power which will be sent to the
antenna.
LTX100( ) Mainframe Assembly's internal sub-assemblies include the following:
1.
DC Power Supply
2.
RF Deck
3.
Status Monitoring (1A0035)
4.
Output Power Detector Board (1A0027)
5.
Reflected Power Detector (1A0029) and Shutdown Switch
6.
Metering and Monitoring Assembly (1A0300)
Page 8
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VL/VH Operating and Service Manual
V -- THEORY OF OPERATION
V. THEORY OF OPERATION (CONTINUED) (Page 2 of 2)
D. BAND PASS FILTERS
BPU150N - Used in the LTX100U UHF Transmitter
BPVH300N - Used in the LTX100VH High VHF Band (Ch 7 - 13) Transmitter
BPVL200N - Used in the LTC100VL High VHF Band (Ch 2 - 6) Transmitter
These Band Pass filters were designed to meet FCC Certification requirements with minimum loss of
RF Power. Thy come tuned and tested to the operating frequency of the transmitter
and should not be adjusted without proper equipment. Replacement filters are available as
from Pineapple Technology, Inc. upon request.
Page 9
Section VI
Schematic
and
Parts List
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VL/VH Operating and Service Manual
A.
Vl -- SCHEMATICS AND PARTS LIST
LTX100U ASSY TREE
Item Qty Type P/N
Title
Top
LTX SERIES UHF TRANSMITTER 100 WATTS
CAT LTX100U
Detail
LTXMAINFRAME UHFLTX SERIES XMTR 100 W UHF
BASIC UNIT
PL
CAT MA1000
M369 CADCO MODULATOR
MODIFIED TO PTI SPECS
PS
BPU150N
BP FILTER 150 W UHF
470-862 MHz
PS
MFR13RU
EQUIPMENT RACK 13 RU
BLK 19 IN DEEP
LTX100U Assy Tree
Page 10
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VL/VH Operating and Service Manual
A.
Vl -- SCHEMATICS AND PARTS LIST
LTX100VL ASSY TREE
Item Qty Type P/N
Title
Top
LTX SERIES XMTR VHF LOW BAN100 WATTS
CAT LTX100VL
Detail
CAT LTXMAINFRAME VHFLTX SERIES XMTR 100 W VHF LBBASIC UNIT
CAT MA1000
M369 CADCO MODULATOR
MODIFIED TO PTI SPECS
PS
BPVL200N
BP FILTER LTX XMTR VHF LB
TYPE N CONNECTORS 200 W
PS
MFR13RU
EQUIPMENT RACK 13 RU
BLK 19 IN DEEP
LTX100VL Assy Tree
Page 11
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VL/VH Operating and Service Manual
A.
Vl -- SCHEMATICS AND PARTS LIST
LTX100VH ASSY TREE
Item Qty Type P/N
Title
Top
LTX SERIES VHF HB 100 WATT X100 WATT
CAT LTX100VH
Detail
PL
LTXMAINFRAME VHFLTX SERIES XMTR 100 W VHF HBBASIC UNIT
PS
BPVH300N
BP FILTER 300W VHF HB CL3NV TYPE N CONNECTORS
PS
MFR13RU
EQUIPMENT RACK 13 RU
BLK 19 IN DEEP
CAT MA1000
M369 CADCO MODULATOR
MODIFIED TO PTI SPECS
LTX100VH Assy Tree
Page 12
Page 13
110 VAC
Audio In
Audio
AC Inlet
Video In
Video
MA1000
Modulator
BPU150N used for LTX100U
BPVH300N used for LTX100VH
BPVL200N used for LTX100VL
Band Pass Filters
AC Inlet
RF Input
RF Output Mon
LTX100( )
Mainframe
Assembly
RF Probe
DB9
Remote
Interface
SIZE
SCALE
1:1
FSCM NO.
DWG NO.
LTX100U/VH/VL
UHF Transmitter
SHEET
Pineapple Technology, Inc.
Rocklin, CA
Band Pass
Filter
REV
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VL/VH Operating and Service Manual
A.
Vl -- SCHEMATICS AND PARTS LIST
LTX Mainframe UHF Assy Tree
Item Qty Type P/N
Title
Detail
PL
LTXMAINFRAME UHFLTX SERIES XMTR 100 W UHF
BASIC UNIT
PS
MF9529A
LTX HEAT SINK HOLDER
AL 090
PS
MF9531A
LTX FRONT PANEL
0125 AL W/PAINT AND SILK
PS
MF9532A
LTX CHASSIS
090 AL ALODYNE W/REAR SILK
PS
PS
PL
MF9533A
MF9534A
MF9535
LTX AIR DAM DEFLECTOR
LTX TOP COVER
LTX100U HEAT SINK
050 AL ALODYNE
O60 AL ALODYNE
STD HEAT SINK W/U250LD FP
10
11
PS
PS
PC9515
PC9514
COUPLER GP COVER TMM3 012 USE ON ALL -30dB COUPLERS
UHF -30 dB COUPLER TMM3 012 DUAL DIRECTIONAL
14
PS
660104
LTX MULTI-FUNCTION METER
HOYT MODEL 3135 ANALOG MTR
15
PS
AC3108
CIRCUIT BREAK/ ON/OFF SWITC 115 VAC 10 A RESETABLE
16
17
PS
PS
AC1003
990200
FILTER, AC LINE
FILTER, AIR DRY
110/220 AC PLUG
COMAIR FILTER/GUARD ASS,Y
18
PS
851035
FAN AC 115 100 CFM 115 VAC
COMAIR-ROTRON MUFFIN XL AC MX2A
19
PS
CA5110
CABLE ASSEMBLY 10 WIRE
10 WIRE SOC TO SOC CONNECTOR
20
PS
480300
CON 2 PIN HEADER
AMP A23837-ND
22
23
PS
PS
AC2010
INHOUSE_LABOR
DC POWER SUPPLY 115/220 VAC320 WATTS 27-31 VDC
PTI LABOR
LOADED
24
PS
INHOUSE-ENG TEST ENG TESTING AND FIXIT
25
PL
1A0300
LTX100 METERING CIRCUIT
FRONT PANEL ASSEMBLY
26
PL
1A0027
PWR MONITOR CK
PC9052B CBR
27
28
PL
PL
1A0035
1A0026
PA STATUS BOARD
VSWR/PWR DET BRD
PC9061H
PC9051A
29
CAT DRV10-40
DRIVER AMP WITH ALC CKT PO 10 W
34
PS
990280
FINGER GUARD 6"
FINGER GUARD 150MM METAL
35
PS
851030
PATRIOT AC FAN 110 V
XL100 EXHAUSE FAN
LOADED
36
PS
481501
AURAL FEMALE PNL CONNECTOXLR TYPE 3 PIN
37
PS
481502
AURAL MALE PLUE XLR
LTX100U LTXMainframe Assy Tree
Page 14
3 PIN
SECTION VI - SCHEMATIC AND PARTS LISTS
SUB-SECTION A - LTX100U/LH/LV
Internal View
Pineapple Technology, Inc.
Rocklin, CA
LTX Mainframe UHF
SIZE
Page 15
SCALE
FSCM NO.
DWG NO.
REV
SHEET
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VL/VH Operating and Service Manual
A.
Vl -- SCHEMATICS AND PARTS LIST
LTX Mainframe VH Assy Tree
Item Qty Type P/N
Title
Top
LTX SERIES VHF HB 100 WATT X100 WATT
CAT LTX100VH
Detail
PL
LTXMAINFRAME VHFLTX SERIES XMTR 100 W VHF HBBASIC UNIT
PS
MF9529A
LTX HEAT SINK HOLDER
AL 090
PS
MF9531A
LTX FRONT PANEL
0125 AL W/PAINT AND SILK
PS
PS
PS
MF9532A
MF9533A
MF9534A
LTX CHASSIS
LTX AIR DAM DEFLECTOR
LTX TOP COVER
090 AL ALODYNE W/REAR SILK
050 AL ALODYNE
O60 AL ALODYNE
10
PS
PS
MF9536
PC9515
LTX100 VHF HIGH HEAT SINK
STD PTI HS MATERIAL
COUPLER GP COVER TMM3 012 USE ON ALL -30dB COUPLERS
12
PS
PC9513
VHF HB -30 dB COUPLER TMM3 DUAL DIRECTIONAL
14
PS
660104
LTX MULTI-FUNCTION METER
15
16
PS
PS
AC3108
AC1003
CIRCUIT BREAK/ ON/OFF SWITC 115 VAC 10 A RESETABLE
FILTER, AC LINE
110/220 AC PLUG
17
PS
990200
FILTER, AIR DRY
COMAIR FILTER/GUARD ASS,Y
18
PS
851035
FAN AC 115 100 CFM 115 VAC
COMAIR-ROTRON MUFFIN XL AC MX2A
19
PS
CA5110
CABLE ASSEMBLY 10 WIRE
10 WIRE SOC TO SOC CONNECTOR
20
22
PS
PS
480300
AC2010
CON 2 PIN HEADER
AMP A23837-ND
DC POWER SUPPLY 115/220 VAC320 WATTS 27-31 VDC
23
PS
INHOUSE_LABOR
PTI LABOR
24
PS
INHOUSE-ENG TEST ENG TESTING AND FIXIT
LOADED
25
PL
1A0300
LTX100 METERING CIRCUIT
FRONT PANEL ASSEMBLY
26
27
PL
PL
1A0027
1A0035
PWR MONITOR CK
PA STATUS BOARD
PC9052B CBR
PC9061H
28
PL
1A0026
VSWR/PWR DET BRD
PC9051A
29
CAT DRV10-40
DRIVER AMP WITH ALC CKT PO 10 W
34
PS
990280
FINGER GUARD 6"
FINGER GUARD 150MM METAL
35
PS
851030
PATRIOT AC FAN 110 V
XL100 EXHAUSE FAN
36
PS
481501
AURAL FEMALE PNL CONNECTOXLR TYPE 3 PIN
HOYT MODEL 3135 ANALOG MTR
LOADED
LTX100VH LTXMainframe Assy Tree
Page 16
SECTION VI - SCHEMATIC AND PARTS LISTS
SUB-SECTION A - LTX100U/LH/LV
Internal View
Pineapple Technology, Inc.
Rocklin, CA
LTX Mainframe High VHF
SIZE
Page 17
SCALE
FSCM NO.
DWG NO.
REV
SHEET
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VL/VH Operating and Service Manual
A.
Vl -- SCHEMATICS AND PARTS LIST
LTX Mainframe VL Assy Tree
Item Qty Type P/N
Title
Top
LTX SERIES XMTR VHF LOW BAN100 WATTS
CAT LTX100VL
Detail
CAT LTXMAINFRAME VHFLTX SERIES XMTR 100 W VHF LBBASIC UNIT
PS
MF9529A
LTX HEAT SINK HOLDER
AL 090
PS
MF9531A
LTX FRONT PANEL
0125 AL W/PAINT AND SILK
PS
PS
PS
MF9532A
MF9533A
MF9534A
LTX CHASSIS
LTX AIR DAM DEFLECTOR
LTX TOP COVER
090 AL ALODYNE W/REAR SILK
050 AL ALODYNE
O60 AL ALODYNE
10
PS
PS
MF9537
PC9515
LTX100 VHF LOW BAND HEAT SI STD PTI HS MATERIAL
COUPLER GP COVER TMM3 012 USE ON ALL -30dB COUPLERS
13
PS
PC9512
VHF LB -30 dB COUPLER TMM3 0DUAL DIRECTIONAL
14
PS
660104
LTX MULTI-FUNCTION METER
15
16
PS
PS
AC3108
AC1003
CIRCUIT BREAK/ ON/OFF SWITC 115 VAC 10 A RESETABLE
FILTER, AC LINE
110/220 AC PLUG
17
PS
990200
FILTER, AIR DRY
COMAIR FILTER/GUARD ASS,Y
18
PS
851035
FAN AC 115 100 CFM 115 VAC
COMAIR-ROTRON MUFFIN XL AC MX2A
19
PS
CA5110
CABLE ASSEMBLY 10 WIRE
10 WIRE SOC TO SOC CONNECTOR
20
22
PS
PS
480300
AC2010
CON 2 PIN HEADER
AMP A23837-ND
DC POWER SUPPLY 115/220 VAC320 WATTS 27-31 VDC
23
PS
INHOUSE_LABOR
PTI LABOR
24
PS
INHOUSE-ENG TEST ENG TESTING AND FIXIT
LOADED
25
PL
1A0300
LTX100 METERING CIRCUIT
FRONT PANEL ASSEMBLY
26
27
PL
PL
1A0027
1A0035
PWR MONITOR CK
PA STATUS BOARD
PC9052B CBR
PC9061H
28
PL
1A0026
VSWR/PWR DET BRD
PC9051A
29
CAT DRV10-40
DRIVER AMP WITH ALC CKT PO 10 W
34
PS
990280
FINGER GUARD 6"
FINGER GUARD 150MM METAL
35
PS
851030
PATRIOT AC FAN 110 V
XL100 EXHAUSE FAN
36
PS
481501
AURAL FEMALE PNL CONNECTOXLR TYPE 3 PIN
HOYT MODEL 3135 ANALOG MTR
LOADED
LTX100VL LTXMainframe Assy Tree
Page 18
SECTION VI - SCHEMATIC AND PARTS LISTS
SUB-SECTION A - LTX100U/LH/LV
Internal View
Pineapple Technology, Inc.
Rocklin, CA
LTX Mainframe Low VHF
SIZE
Page 19
SCALE
FSCM NO.
DWG NO.
REV
SHEET
Page 20
FWD Pwr P1
P2
P3
Gnd P4
Shutdown P5
P6
RFLD Pwr P7
ALC P8
+8 VDC P9
110 VAC
RF
DB9
VH250LD PC9513 Note1
PC9512 Note1
VL500A
UDR10E
UDR10E
LTX100VH Ch 2 - 6
Ch 7 - 13
P/S
PC9514 Note1
Direct’l
Coupler
LTX100VL
PA
PA
U250LD
Driver
RF IN
+DC
Ch 14 - 69 UDR10E
Channel
110 VAC
AC Inlet
PS1
P/S
Driver
RF Deck
LTX100U
PA Fan
110VAC
ON\OFF
SW
+DC
RF IN
DC Output
From
RF Output
Monitor Tap
DC Metering
and
DC Monitoring
1A0035
Directional
Coupler
CAL
ATT
Pineapple Technology, Inc.
Rocklin, CA
RF
RF Probe
SCALE
1:1
FSCM NO.
DWG NO.
SHEET
REV
LTX100 Mainframe Assembly
SIZE
CAL
ATT
SECTION VI - SCHEMATIC AND PARTS LISTS
SUB-SECTION C - LTX100U/VH/VL
No Serviceable Parts
Pineapple Technology, Inc.
Rocklin, CA
BPU150 Band Pass Filter
SIZE
Page 21
SCALE
FSCM NO.
DWG NO.
REV
SHEET
SECTION VI - SCHEMATIC AND PARTS LISTS
SUB-SECTION D - LTX100U/VH/VL
No Serviceable Parts
Pineapple Technology, Inc.
Rocklin, CA
SIZE
Page 22
SCALE
Low VHF Bandpass Filter
CIRCUIT
DIAGRAM
FSCM NO.
DWG NO.
SHEET
REV
Section VII
Recommended
Routine
Maintenance
PINEAPPLE TECHNOLOGY, INC.
LTX100U/LH/LV Operating and Service Manual
VII -- ROUTINE MAINTENANCE
VII --- ROUTINE MAINTENANCE
Routine Maintenance on the transmitter is very simple and straight forward. PTI recommends the following
steps to ensure long and eliable trouble-free service.
SCHEDULE: DAILY OR WEEKLY SERVICE
1.
Check output power level to ensure that the meter is reading in the GREEN. If the level has changed
adjust the output level to 100% using the modulator output level adjust.
2.
Check and record all meter readings in the station log.
3.
Review readings and compare to history for possible variation that could indicate problems.
4.
Check the air inlet filter and clean if necessary. If it looks dirty, it is dirty. Snap off the front grill and
wash the filter with light detergent and dry thoroughly before reinstalling. DO NOT use oils on the
filter.
5.
Clear any items placed in front or in the rear of the transmitter that may restrict air flow.
SCHEDULE: MONTHLY +
All the items listed above with air filter cleaning necessary.
NOTE: REPLACEMENT FILTERS ARE AVAILABLE THRU MOST ELECTRONIC DISTRIBUTERS.
LOOK FOR COMAIR ROTRON P/N: 020172
FACILITIES
●
Clean all air inlet filters and exhaust outlets to ensure that the transmitter is getting clean
unobstructed airflow.
●
Perform recommended service on air condition systems.
●
Rodent traps or baits should be renewed to keep the facilities clear of these pests which can
cause damage to the transmitter.
Page 23
Section VIII
Adjustments
and
Tuning
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VH/VL Operating and Service Manual
VIII -- ADJUSTMENTS AND TUNING
VIII --- ADJUSTMENTS AND TUNING
The LTX100U/VH/VL is a new series of analog transmitters offered by Pineapple Technology, Inc. The
latest in LDMOS device and circuit technology are employed to ensure reliable and serviceable
operation for many years.
There are very few adjustments necessary to maintain full service condition. Typically the gain
adjustment shown in the initial Transmitter Turn-On Procedure (Section IV) of this manual should
require minimal attention. The front meter panel has been set up so that 100% indication in
Forward Power is equivalent to 100W peak sync power.
The transmitter output must remain on the channel licensed by the FCC and in accordance
with the supplied band pass filter and set up on the exciter/modulator.
Page 24
Section IX
Problem
Solving
Troubleshooting
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VH/VL Operating and Service Manual
IX -- PROBLEM SOLVING/TROUBLE SHOOTING
IX - PROBLEM SOLVING & TROUBLE SHOOTING (Page 1of 2)
The LTX100U/VH/VL is a "MODULAR ASSEMBLY" where most of the sub-assemblies can be
removed and or replaced as necessary as necessary to maintain full service. To service this transmitter,
it is best to become familiar with the various sub-assemblies by reviewing the transmitter block diagram
and it's associated subs shown in the introduction. Any work performed on a transmitter licensed by
the FCC must be performed by qualified personnel.
FAILURE ANALYSIS STARTS WITH THE FOLLOWING ASSUMPTIONS:
1. The transmitter is connected to an AC source which is within the specified voltage range
and has ample power to run the transmitter.
2. The antenna has been checked out and a proper match has been verified.
3. The room temperature is < +35 degrees Celsius (+95 degrees Fahrenheit)
4. There are no restrictions in the air flow in or out of the building.
5. The video and aural signals to the modulator comply with stated specifications.
CHECKING THE WARNING LIGHTS
There are several warning signals visible on the front of the transmitter that will alert the technician
of possible problems. When viewed from the front, all the lights should be GREEN indicating normal
operation. An alert signal is indicated by a RED light. We will focus on RED alert signals in this section.
LTX Mainframe Assembly
FAN FAULT
RED indicates that the fuse supplying AC to the fan has failed. The fuse
is located just inside the front panel near the top. See Fig. 1 for location.
CHECK: FUSE AND/OR FAN
Fig. 1
Page 25
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VH/VL Operating and Service Manual
IX -- PROBLEM SOLVING/TROUBLE SHOOTING
IX - PROBLEM SOLVING & TROUBLE SHOOTING (Page 2of 2)
TEMP FAULT
RED indicates over temperature of PA or High VSWR
If High VSWR, the light will cycle 10 seconds OFF and 2 seconds ON
Put transmitter in STANDBY. Investigate antenna installation and
connections, check transmission lines and connections. Check
that transcoder up converter is on frequency.
If High Temperature, the light will cycle OFF for several minutes then ON
for several minutes.
Check: Room temperature
Check: For Blocked Air Filter
Check: For Blocked Air Flow
Check: Transcoder Drive level. Verify output power is at 100% or less.
NOTE: If the AC Power is ON and all LED's are OFF and all meter readings are Zero (0) the DC Power
Supply may cycle on and off if the internal fan has failed or Hi temp has failed. The
internal DC supply may have failed and needs replacing.
Page 26
Section X
Warranty
PINEAPPLE TECHNOLOGY, INC.
LTX100U/VH/VL Operating and Service Manual
X -- WARRANTY
X -- WARRANTY
The WARRANTY provided by Pineapple Technology, Inc. (PTI) on this transmitter is detailed below.
It should be noted that some of the equipment sub-systems have warranty coverage by the orginal
manufacture that differs from the standard warranty provided by PTI Warrantydetails on equipment falling
into this category may be found in the Manufacturers instruction manual provided with the transmitter.
In all cases, replacement units of this equipment are normally in stock at PTI for quick turn service
support to our customers during the PTI Standard Warranty period.
STANDARD WARRANTY
Seller warrants that each Product sold by it is free of defects in materials and workmanship. Seller's
obligation under said warranty continues for a period of one (1) year from date of shippment. Repairs or
replacement of defective parts shall be the sole and exclusive remedy under waranty, at Seller option,
provided that Seller may, as an alternative, elect to refund an equitable portion of the purchase price
of the product. THIS WARRANTY IS EXPRESSLY IN LIEU OF AND EXCLUDES ALL OTHER
EXPRESS OR IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO WARANTIES OF
FITNESS FOR A PARTICULAR PURPOSE, USE, OR APPLICATION, AND ALL OTHER OBLIGATIONS
OR LIABILITIES ON THE PART OF THE SELLER, UNLESS SUCH OTHER WARRANTIES
OBLIGATIONS OR LIABILITIES ARE EXPRESSLY AGREED TO IN WRITING BY SELLER.
WARRANTY REPLACEMENT AND REPAIRS
All claims under warranty must be made promptly after occurrence of circumstances giving rise to thereto
and must be received within the applicable warranty period by seller or its authorized representatives.
Such claims must be documented on a PTI* Field Failure Report with a full description of the circumstances
giving rise to the claim. Before any products are returned for repair and/or adjustment, written authorization
form seller or its authorized representative for the return and instructions as to how and where these
products should be shipped must be obtained. This is to include a Return Authorization (RA) number
provided by the seller or authorized representative, this must accompany ALL returns. Any product
returned to the seller for the examination shall be sent prepaid via the means of transportation indicated as
acceptable by seller. Seller reserves the right to reject any warranty claim not promptly reported and any
claim on any item that has been altered, i.e. circuit modifications, components removed, or has been shipped
by non acceptable means of transportation . When a product has been returned for examination and inspection,
or for any other reason, customer shall be responsible for all damage resulting from improper packaging or
handling, and for loss in transit, notwithstanding any defect or nonconformity in the product. In all cases the
seller has sole responsibility for determining the cause and nature of the failure, and the Seller's
determination with regard thereto shall be final. If it is found that Seller's Product has been returned without
cause and is still serviceable, customer will be notified and the Product returned at its expense, in addition,
a charge for testing and examination may, in Sellers sole discretion be made on Products so returned.
* A field Failure Report is included at the end of this manual - Additional Field Failure Reports can be obtained by calling
Pineapple Technology, Inc. at (916) 652-1116 or you may download one from our website at www.ptibroadcast.com
in the Warranty section.
Page 27

---

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