JXZITX21-100Indoor Transmitter

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 sp…

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Proprietary FCC ID: JXZITX21-100 4.0 EXTERNAL PHOTOS This section should include clear, focused pictures of the overall appearance showing all user accessible controls and connectors. The rule sections, which require these photos to be submitted, are 2.975(a)(5), 2.983(g) and 2.1033(b)(7). Figure 4. ITX21-100 Broadband Transmitter (Front). Type Acceptance Report 12/9/2004 9 Proprietary Proprietary FCC ID: JXZITX21-100 Figure 5. ITX21-100 Broadband Transmitter (Rear). Type Acceptance Report 12/9/2004 10 Proprietary

Proprietary FCC ID: JXZITX21-100 5.0 ID LABEL AND LOCATION This section should include the FCC ID label, its location on the product, and any statements required by the rules that will be on the product. For examples and information on FCCID labels see 2.925 and 2.926 of the commissions rules. Some examples of statements required that should go in this section are the 15.19 and 15.214(c) statements. 5.1 Identification Labels and Photographs This label will be located at two places, inside on the left side-interior of the ITX21-100 unit, and outside on the bottom surface. Cable AML 3427 W. Lomita Boulevard Torrance, CA USA 90505 Model: Model No: Part No: Serial No: FCC ID: Date of Mfr: Indoor Broadband Transmitter ITX21-100 4030013-1 1233 JXZITX21-100 June 2004 Made in USA Figure 6. Sample of ID Label. Type Acceptance Report 12/9/2004 11 Proprietary Proprietary FCC ID: JXZITX21-100 ID Label Figure 7. Inside ID Label Location. Type Acceptance Report 12/9/2004 12 Proprietary Proprietary FCC ID: JXZITX21-100 Figure 8. Outside ID Label Location. Type Acceptance Report 12/9/2004 13 Proprietary

Proprietary FCC ID: JXZITX21-100 6.0 INTERNAL PHOTOS This section should include internal photos showing the top and bottom of each printed circuit board sufficient to clearly show component placement and chassis assembly. The rule sections, which require these photos are 2.975(a)(5), 2.983(g), 2.1033(b)(7). On- Delay 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 9. ITX21-100 Component Layout. The ITX21-100 is assembled from discrete components. It does not use a discrete printed circuit board. Type Acceptance Report 12/9/2004 14 Proprietary Proprietary FCC ID: JXZITX21-100 P/N: 87225-013 (Front) P/N: 52106-001 (Front) P/N: 87194-000 P/N: 87225-013 (Back) P/N: 52106-001 (Back) Type Acceptance Report 12/9/2004 15 Proprietary Proprietary FCC ID: JXZITX21-100 P/N: 87161-003 P/N: 87161-003 Type Acceptance Report 12/9/2004 16 Proprietary

Proprietary FCC ID: JXZITX21-100 2.0 OPERATIONAL DESCRIPTION This section should include any operational or technical descriptions regarding how the device operates, is modulated, or meets specific requirements. Some examples of operational descriptions include: 2.1 General Description The ITX21-100 shown in Figure 4 is a solid-state broadband transmitter that converts a VHF input signal of 116-122 MHz to a microwave signal of 2156-2162 MHz. The ITX21-100transmitter consists of the following. 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. 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 ITX21-100 transmitter 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. Type Acceptance Report 12/9/2004 2 Proprietary Proprietary FCC ID: JXZITX21-100 2.2 Technical Specifications ITX21-100 Transmitter Input Frequency: 116-122 MHz Nominal Input Level for 1 TV: +40 dBmV Output Frequency: 2156-2162 MHz Channels Average Power dBm/Channel Peak Power dBm/Channel C/N (dB) 1 37.5 40.0 64.5 Local Oscillator Frequency: 2278 MHz Frequency Response: ±1 dB Frequency Stability: 0.0005% Input Return Loss: 15 dB Input Connector: Type "F" Output Return Loss: 18 dB Output Connector: Type "N" Temperature Range: 60° to 100°F (16° to 38°C) Humidity: 95% max. Primary Power: 120/240 VAC, 50/60Hz (per customer specification) Power Consumption: 840 VA RMS Mounting: EIA Standard Relay Rack Weight: 56 lb. (25.4 kg) Dimensions: 19" W x 12.5" H x 24" D (48.3cm W x 31.8cm H x 61cm D) Type Acceptance Report 12/9/2004 3 Proprietary Proprietary FCC ID: JXZITX21-100 The ITX21-100 Transmitter consists of the following circuits or modules: 1. Upconverter Section 2. Power Amplifier 3. Power Supply System 4. Monitoring and Diagnostic Circuits - connectors and switches. 5. On-Delay Timer Assembly. In addition, microwave isolators and filters are used as necessary to ensure the stability and purity of transmitted signals. 2.3 Upconverter Section The Upconverter Section is comprised of the following major functional circuits or modules: 6. Hybrid Local Oscillator 7. Upconverter/ Mixer 8. Filter Assembly Hybrid Local Oscillator – The local oscillator consists of a crystal oscillator, frequency multiplier, and a band pass filter all encapsulated in solid 6061-T6 aluminum. The output of the local oscillator provides pump power to the signal upconverter. The local oscillator is powered by +12 VDC. Upconverter Mixer – The translation from VHF to microwave frequencies takes place here. The mixer is also called an "upper sideband upconverter". The desired output of the upconverter is a signal at a frequency, which is the sum of the local oscillator, and VHF input frequencies. The upconverter also generates unwanted signals which have to be filtered out, among them the "lower sideband", LO leakage, and others. Filter Assembly – There are two filters. The group band-pass filter is tuned to pass the upper sideband. The notch filter is tuned to attenuate the local oscillator leakage without affecting the output signal. 2.4 Power Amplifier Chains The power amplifier is a state of the art linearised device with a 1 dB compression point of 100-Watts average (50 dBm). The design incorporates four stages of amplification in series, each incorporating pre-matched GaAs (Gallium Arsenide) power modules. The total gain is approximately 40 dB. In addition to the microwave circuits, the amplifier includes DC voltage regulator circuits, output RF monitoring circuits, and TTL-actuated power-off capabilities. The TTL circuit uses a 5VDC voltage regulator to turn the power amplifier’s voltage regulators on or off. +5VDC to the power amplifier will activate the TTL circuit, causing the amplifier to turn itself off. 2.5 Power Supply Assembly Two +12 VDC and one +24 VDC power supplies are used to provide the DC voltage. A +12 VDC linear power supply is used to provide power to the internal downconverter and Local Oscillator. A 5 VDC regulator is only used for the TTL switch for the power amplifier. The MDS downconverter is powered by a 24 VDC power supply. A +12 VDC switching power supply is used to power everything else in the compact transmitter. Type Acceptance Report 12/9/2004 4 Proprietary Proprietary FCC ID: JXZITX21-100 2.6 Diagnostic Circuits 1 The ITX21-100 transmitter has several connectors and switches. Connectors - There are two monitor connectors on the front panel. The transmitter’s input and output at VHF can be viewe…

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Proprietary FCC ID: JXZITX21-100 Type Acceptance Report 12/9/2004 18 Proprietary 8.0 SCHEMATICS This section should include the electrical schematics of the device showing RF generation circuits, input signal path circuitry, and clock lines. The rule sections which require schematics to be submitted are 2.983(d)(7), and 2.1033(b)(5). Proprietary FCC I D : JXZ I T X 21- 100 Ty pe Acceptance Report 12/9/2004 19 Proprietary J1 COAX F FILTER BPF87110-005 87112-013 FILTER NOTCH 42106-001 VHF PROCESSOR COAX FCOAX N TTL +12V BUSS -40 RF MONITOR2156-2162 MHz VHF MONITOR116-122 MHz +12VDC BUSS GND BUSS PS1PS2 PWR INSERT DOWN CONVERT MMDS DOWN CONVERTERCUSTOMER SUPPLIED LNA87194-000G=12 dB +5V(TTL) AC HIGHAC LOWAC GND 120 or 240 VAC DPM DC DIAGNOSTICS RF OUTPUT2156-2162 MHz37.5 dBm Output VHF INPUT116-122 MHz40 dBmV RF MON+12V 83517-001 83520-004 TIMER RELAY INPUT OUTPUT 12 3 ISOLATOR 87103-221 +12VDC +5VDC +12VDC+12VDC 1 2 3 ISOL 87103-222 LOCAL OSCILLATOR 87225-013 MIXER87202-019G= -8 dB F110A UPCONVERTER MONITOR TERM DIR COUPLER 87102-210 RF MON RF SAMPLE @ 1.7A@ 25A AC INPUT AC TO DPM FRONT PANEL CONTROL POWER AMP87161-003G=56 dB +12V BUSS 87102-230 DIR COUPLER -10 87102-210 DIR COUPLER LO MONITOR 84311-01010 dB Pad PS3 83501-008 +24VDC 0.7A +24V FAN83401-050 Relay81202-001 87331-101 CIRCULATOR87099-001 TERMINATION84211-007 PANEL MOUNT84122-008 12V com 1 NO 2 SWITCH RESISTOR 2278MHz FILTER BPF87151-013 ECN # REV DATE S H E E T O F S C A L E DRAWING NO. DATE APPROVED BY: REV. SIZE DATE DRAWN BY: T I T L E C O M P A N Y CABLE AML, INC. Torrance, California, USA 1 1 HCK 04-15-04 4030013-1 ITX21-100 BLOCK DIAGRAM -- -- Figure 10. ITX21-100 Transmitter Schematic.

Proprietary FCC ID: JXZITX21-100 Type Acceptance Report 12/9/2004 23 Proprietary 10.0 TEST REPORTS This section should include the test report and data showing compliance with all applicable technical standards. The rule sections which require the test report to be submitted are 2.983(e), and 2.1033(d)(6). Test report is defined as a "complete package" showing data, graphs, test method description, and a list of test equipment 10.1 RF Power Measurements Figure 15 shows the block diagram of the test set-up used for the measurements. The results are shown in Table 2 below. Number of channels Peak Sync Power (per channel) Intermodulation Distortion Products (dBc below sync peak) 1 10 Watts 65.5 MDS TRANSMITTER LOAD SPECTRUM ANALYZER POWER METER 40 dB40 dB Figure 15. RF Power Measurement Test Set-up. Table 2. RF Power Measurements. Proprietary FCC I D : JXZ I T X 21- 100 Ty pe Acceptance Report 12/9/2004 24 Proprietary Figure 16. RF Pow e r Measurement, Output Pow e r Plot, 10 Watts - 1 Channel. Proprietary FCC ID: JXZITX21-100 Type Acceptance Report 12/9/2004 25 Proprietary 10.2 Frequency Response The frequency response test set-up is shown in Figure 17. Table 3 shows the measured frequency response. The sweep display is shown in Figure 18. SWEEP GENERATOR MDS TRANSMITTER LOAD SPECTRUM ANALYZER POWER METER PLOTTER Figure 17. Frequency Response Test Set-up. 40 dB40 dB Proprietary FCC I D : JXZ I T X 21- 100 Ty pe Acceptance Report 12/9/2004 26 Proprietary Figure 18. Frequency Response. Proprietary FCC ID: JXZITX21-100 Type Acceptance Report 12/9/2004 27 Proprietary Table 3. Measured Frequency Response. Frequency (MHz) Level (dBm) Delta (dB) 2156 -6.5-0.5 2157 -6.0 0.0 2158 -5.5 0.5 2159 -6.0 0.0 2160 -5.5 0.5 2161 -5.5 0.5 2162 -6.0 0.0 10.3 Occupied Bandwidth The test set-up for occupied bandwidth is shown in Figure 15. The occupied bandwidth spectrum is shown in Figure 19. Proprietary FCC I D : JXZ I T X 21- 100 Ty pe Acceptance Report 12/9/2004 28 Proprietary Figure 19. Occupied Bandw idth. Proprietary FCC ID: JXZITX21-100 Type Acceptance Report 12/9/2004 29 Proprietary 10.4 Conducted Spurious Emissions The test set-up for conducted spurious emissions is shown in Figure 15. Spectrum Analyzer presentations of the measured results are shown in Figure 20 and Figure 21. Table 4 contains the tabulated results of these measurements. Table 4. One Channel Loading Data. Frequency Source Peak Sync level Observed/Channel 2156 to 2162 MHz 1 Carrier 10 Watts 2156 to 2162 MHz Lower Composite Triple Beat Products -67 dBc 2156 to 2162 MHz Upper Composite Triple Beat Products -66 dBc 4312 to 4318 MHz Second Harmonic -78 dBc 6468 to 6474 MHz Third Harmonic -82 dBc Proprietary FCC I D : JXZ I T X 21- 100 Ty pe Acceptance Report 12/9/2004 30 Proprietary Figure 20. Conducted Spurious Emissions 1 Channel Loading. Proprietary FCC I D : JXZ I T X 21- 100 Ty pe Acceptance Report 12/9/2004 31 Proprietary Figure 21. Conducted Spurious Emissions 1 Channel Loading. Proprietary FCC ID: JXZITX21-100 Type Acceptance Report 12/9/2004 32 Proprietary 10.5 Radiated Emissions The transmitter was loaded at full power with one channel and its output terminated with a high power 50-ohm termination. An antenna dipole was located 4 meters from the transmitter and connected to the Spectrum Analyzer. The antenna was rotated for maximum signal and the data recorded. This procedure was repeated for the second and third harmonics of the signal, with the following results: Table 5. Radiated Emissions. Frequency Measured Level 2156 to 2162 MHz -95.0 dBm 4312 to 4318 MHz Less than –99 dBm 6468 to 6474 MHz Less than –95 dBm The procedure was repeated with an adjustable length dipole for the 40 to 230 MHz range and extended in the upper range to 12,000 MHz. No measurable signals were observed in this range, with the Spectrum Analyzer set at a minimum sensitivity of -97 dBm. A Spectrum Analyzer presentation of the data shown in Table 5 above is shown in Figure 22, Figure 23 and Figure 24. The observed radiation level in the 2156 to 2162 MHz range can be referenced to the transmitter output power as follows: Assuming isotropic radiation of a signal of 10 watts peak power, the power density at 4 meters would be: Power density = P / 4π D 2 = 10 / 4π 4 2 = 49.74 x 10 -3 Watt/m 2 Assuming a transmission with the pattern of a dipole antenna, the power density is increased by a factor of 1.64 times to: 1.64 x 49.74 x 10 -3 Watt/ m 2 = 81.57 x 10 -3 Watt/m 2 Since a dipole is used to receive the signal, the received signal level equals the power density times the effective area of the receive antenna, which is 1.64 (λ 2 )/ 4π: Received signal level = 81.57 x 10 -3 x (1.64 x (0.12) 2 /4π) = 153.29 x 10 -6 Watts = -8.14 dBm. Since the actual received signal level is –95.0 dBm (from Table 5 above), the relative level is: Relative receive signal level = -8.14 – (-95.0) = 86.86 dBc Proprietary FCC I D : JXZ I T X 21- 100 Figure 22. Radiated Emissions Fundamental. Ty pe Acceptance Report 12/9/2004 33 Proprietary Proprietary FCC I D : JXZ I T X 21- 100 Figure 23. Radiated Emissions 2 nd Harmonic. Ty pe Acceptance Report 12/9/2004 34 Proprietary Proprietary FCC I D : JXZ I T X 21- 100 Figure 24. Radiated Emissions 3 rd Harmonic. Ty pe Acceptance Report 12/9/2004 35 Proprietary Proprietary FCC I D : JXZ I T X 21- 100 Figure 25. QAM Spectral Mask. Ty pe Acceptance Report 12/9/2004 36 Proprietary Proprietary FCC I D : JXZ I T X 21- 100 Ty pe Acceptance Report 12/9/2004 37 Proprietary Figure 26. VSBAM Spectral Mask. Proprietary FCC ID: JXZITX21-100 10.6 Frequency Stability The frequency stability test set-up is shown in Figure 27. Table 6 shows the measured results. MDS TRANSMITTER LOAD SPECTRUM ANALYZER USING FREQUENCY COUNTER FUNCTION 40 dB Figure 27. Frequency Stability Test Set-up. Table 6. Frequency Stability. Date FREQUENCY-Hz DRIFT-Hz 9-5-04 2278000000 0 9-12-04 2278000006 6 9-19-04 2278000032 32 9-26-04 2278000100 100 10-2-04 2278000045 45 Type Accepta…

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