Cable AML ITX21-100 Handbuch
Cable AML
Installation
and
Maintenance
Manual
Indoor Broadband Transmitter
Model: ITX21-100
INSTALLATION AND
MAINTENANCE MANUAL
for
Indoor Broadband Transmitter
Model: ITX21-100
Cable AML, Inc.
3427 W. Lomita Boulevard
Torrance, California 90505 USA
TEL 310 517-8888 or 702 363-5660
FAX 310 517-8555 or 702 363-2960
Copyright ©2004 Cable AML, Inc.
IM4030013-1 Rev – 20040713
Indoor Broadband Transmitter – ITX21-100
IM4030013-1 Rev – i
TABLE OF CONTENTS
Section Page
1.0 INTRODUCTION...................................................................................................... 1
2.0 CIRCUIT DESCRIPTION.......................................................................................... 7
2.1 Upconverter Section.......................................................................................................7
2.2 Power Amplifier Chains..................................................................................................7
2.3 Power Supply Assembly.................................................................................................8
2.4 Diagnostic Circuits .........................................................................................................8
2.5 On-Delay Timer Assembly .............................................................................................8
3.0 INSTALLATION ....................................................................................................... 9
3.1 Unpacking ......................................................................................................................9
3.2 Location..........................................................................................................................9
3.3 Input Voltage Requirements...........................................................................................9
3.4 Operating and Diagnostic Connections..........................................................................9
4.0 OPERATION.......................................................................................................... 13
4.1 Output Level Setting.....................................................................................................13
4.2 Ambient Conditions......................................................................................................14
4.3 Thermal Sensor Switch................................................................................................14
5.0 MAINTENANCE AND TROUBLESHOOTING....................................................... 15
5.1 Maintenance.................................................................................................................15
5.2 External Troubleshooting .............................................................................................15
5.3 Internal Troubleshooting ..............................................................................................16
6.0 SPECIFICATIONS ................................................................................................. 19
Indoor Broadband Transmitter – ITX21-100
IM4030013-1 Rev – ii
LIST OF ILLUSTRATIONS
Figure Page
1 ITX21-100 Broadband Transmitter..................................................................2
2 ITX21-100 Component Layout........................................................................ 3
3 ITX21-100 Block Diagram...............................................................................5
4 DC Diagnostics Switch Positions. ................................................................... 8
5 Front Panel Connection Points......................................................................10
6 Rear Panel Connection Points...................................................................... 11
7 Output Level Adjustment...............................................................................13
LIST OF TABLES
Table Page
1 Typical Channel Loading for ITX21-100 Input/Output Levels........................ 10
Indoor Broadband Transmitter – ITX21-100
IM4030013-1 Rev – 1
1.0 INTRODUCTION
The ITX21-100 shown in Figure 1 is a solid-state broadband transmitter that converts a
VHF input signal of 119 MHz to a microwave signal of 2.159 GHz.
The ITX21-100transmitter consists of the following assemblies (refer to Figure 2).
1. Upconverter – for converting the incoming VHF signal to microwave. The
upconverter section contains all components necessary for upconversion, i.e. local
oscillator, mixer, as well as band-pass and notch filters.
2. Power Amplifier – The amplification is accomplished with minimum distortion by a
state of the art linearised Gallium Arsenide FET microwave power amplifier. The
power amplifier is protected from failure due to overheating by an internal
temperature sensor. The sensor circuit automatically switches off the amplifier D.C.
power when the amplifier temperature exceeds 158 degrees F (70 degrees C).
3. Power supply system – The microwave modules are powered from a +12 VDC
switching power supply. The local oscillator is powered from a +12 VDC linear
power supply. A 24 VDC power supply powers the downconverter. A +5 VDC
voltage regulator is used to for the power amplifier’s TTL circuit.
4. Monitoring and Diagnostic Circuits – Depending on the configuration of the
compact transmitter, the input and output can be continuously monitored without
interruption of service with a standard TV set or a field strength meter by means of a
front panel dual function coaxial connector. Diagnostic DC voltages can also be
continuously monitored via a front panel meter with a selectable switch or a rear
panel multi-pin connector.
5. On-Delay Timer Assembly – Upon start-up of the compact transmitter, a binary
counter is used to delay voltage to the power amplifier. This gives the +12 VDC
switching power supply time to stabilize.
The ITX21-100transmitter can be equipped to operate on either 120 or 240 VAC at 50 to
60 Hz. This option is specified by customer request, and each unit is shipped according to
this specification.
Complete specifications are listed in Section 6.0.
Indoor Broadband Transmitter – ITX21-100
IM4030013-1 Rev – 2
Figure 1. ITX21-100 Broadband Transmitter.
Indoor Broadband Transmitter – ITX21-100
IM4030013-1 Rev – 3
On- Dela
y
Timer Circuit
Upconverter
Test-Point
+12 VDC
Power Supply
Output
Circulator
Local Oscillator
Filter Local
Oscillator Meter
VHF Processor
+12 VDC Fan
(Power Amp
Underneath)
+24 VDC
Power Supply
Figure 2. ITX21-100 Component Layout.
Indoor Broadband Transmitter – ITX21-100
IM4030013-1 Rev – 4
This Page Intentionally Left Blank.)
Indoor Broadband Transmitter – ITX21-100
IM4030013-1 Rev –– 5
J1
COAX F FILTER BPF
87110-005 87112-013
FILTER NOTCH
42106-001
VHF PROCESSOR
COAX F
COAX N
TTL
+12V BUSS
-40
RF MONITOR
2150-2162 MHz
VHF MONITOR
116-128 MHz
+12VDC BUSS
GND BUSSPS1
PS2
PWR
INSERT DOWN
CONVERT
MMDS DOWN CONVERTER
CUSTOMER SUPPLIED
LNA
87194-000
G=12 dB
+5V(TTL)
AC HIGH
AC LOW
AC GND
120 or 240 VAC
DPM
DC DIAGNOSTICS
RF OUTPUT
2150-2162 MHz
33.0 dBm/Ch 2 Channels AVG PWR
VHF INPUT
116-128 MHz
25 dBmV/Ch 2 Channels
RF MON
+12V
83517-001
83520-004
TIMER
RELAY
INPUT
OUTPUT
12
3
ISOLATOR
87103-221
+12VDC +5VDC
+12VDC
+12VDC
12
3
ISOL
87103-222 LOCAL OSCILLATOR
87225-013
MIXER
87202-019
G= -8 dB
F1
10A
UPCONVERTER MONITOR
TERM
DIR COUPLER
87102-210
RF MON
RF SAMPLE
@ 1.7A
@ 25A
AC INPUT
AC TO DPM
FRONT PANEL CONTROL
POWER AMP
87161-003
G=56 dB
+12V BUSS
87102-230
DIR COUPLER
-10
87102-210
DIR COUPLER
LO MONITOR
84311-010
10 dB Pad
PS3
83501-008
+24VDC
0.7A
+24V
FAN
83401-050
Relay
81202-001
87331-101
CIRCULATOR
87099-001
TERMINATION
84211-007
PANEL MOUNT
84122-008
12V
com
1NO
2
SWITCH
RESISTOR
2278
MHz
FILTER BPF
87151-013
ECN # REV DATE
SHEET OF
SCALE
DRAWING NO.
DATEAPPROVED BY:
REV.
SIZE
DATEDRAWN BY:
TITLE
COMPANY
CABLE AML, INC. Torrance, California, USA
1 1
HCK 04-15-04
4030013-1
ITX21-100 BLOCK DIAGRAM
-- --
Figure 3. ITX21-100 Block Diagram.
Indoor Broadband Transmitter – ITX21-100
IM4030013-1 Rev –– 6
(This Page Intentionally Left Blank)
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