Caution These servicing instructions are for use by qualified personnel only. To reduce the risk of electrical shock, do not perform any servicing other than that contained in the Installation and Troubleshooting Instructions unless you are qualified to do so. Refer all servicing to qualified service personnel. Special Symbols That Might Appear on the Equipment This symbol indicates that dangerous voltage levels are present within the equipment.
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Contents Section 1 Introduction Using This Manual ........................................................................................................................................................................... 1-3 Related Documentation................................................................................................................................................................... 1-3 Document Conventions............................................................................
ii Contents Vertical Automatic Drive Unit/QAM Automatic Drive Unit...............................................................................................3-11 VADU/VQADU Pads and Levels.....................................................................................................................................3-12 Return Path Alignment...............................................................................................................................................................
Contents iii Figures Figure 1-1 MBV3-100* — closed .................................................................................................................................................... 1-1 Figure 1-2 MBV3-100* — open ....................................................................................................................................................... 1-2 Figure 2-1 MBV3-100* — base and lid.......................................................................................
Section 1 Introduction The Motorola® 1 GHz STARLINE® series of MiniBridger amplifiers, model MBV3-100*, accept a single input and provide high operational gain to a single or dual output. The MBV3-100* amplifier series meets Telcordia GR-1098 core voltage surge requirements using surge waveforms as described in IEEE C62.41. The MBV3-100* is also FCC, CE, and CCC approved.
1-2 Introduction Figure 1-2 illustrates an open MBV3-100*.
Introduction 1-3 Using This Manual The following sections provide information and instructions to bench test, install, and operate the MBV3-100*. Section 1 Introduction provides a brief description of the product, identifies the information contained in this manual, and gives the help line telephone number and repair return information. Section 2 Overview describes the MBV3-100* and includes details on the various options and their functions.
1-4 Introduction If You Need Help If you need assistance while working with the MBV3-100*, contact the Motorola Technical Support Call Center (TSCC): Toll Free : 1-888-944-HELP (1-888-944-4357) Direct: +1 847-725-4011or See Local Country Calling Numbers Below. Motorola Online: http://businessonline.motorola.
Introduction 1-5 The e-mail address for the Call Management System is: BCS.Helpdesk@motorola.com.
Section 2 Overview The MBV3-100* is a balanced three output amplifier used in CATV distribution systems. All models are high-gain, three-stage hybrid amplifiers designed to drive both a cascade and a local distribution system. The MBV3-100* is powered by the 60/90 VAC cable supply and can be configured to pass this power to additional amplifiers and line extenders. Installation of the return path enables two-way signal flow. Single output models are also available.
2-2 Overview Ordering Matrix Several models of the MBV3-100* are available. The MBV3-100* is fully configured in the factory per model requested. You can find the model name on labels on the outside of the shipping carton, the side of the MBV3-100* housing, and the side of the electronics module. Figure 2-2 identifies and describes the model strings. Not all combinations are available.
Overview 2-3 Housing The MBV3-100* is furnished in an MB-HSG aluminum housing that protects the electronics from weather and dissipates internally generated heat. Figure 2-3 illustrates a top view of the MB-HSG housing and provides its dimensions. ASSEMBLED IN MEXICO Figure 2-3 MB-HSG dimensions — top view Figure 2-4 illustrates a side view of the MB-HSG and provides its dimensions.
2-4 Overview Coaxial cable connections to the housing are made using conventional 5/8 × 24 threads per-inch stinger-type connectors. Five port plugs in the cover enable access to internal test points without opening the housing. The interior platform assembly of the 15A MB-HSG differs from the platform assembly of the 10A MB-HSG (earlier models MB-550D-H, MB-750D-H, and MB-75SH, AH, and JH). However, you can upgrade the 10A MB to a 15A MB using existing housings.
Overview 2-5 Gaskets Each housing is equipped with a recessed woven-wire RF gasket and a silicone-rubber weather gasket to provide a seal between the housing base and lid (Figure 2-5). These gaskets provide efficient ground continuity, RF shielding, and weather protection. Both gaskets must be in place and in good condition to ensure proper operation and protection of the station. The weather gasket should be lightly coated with silicone grease each time the amplifier is opened.
2-6 Overview Port Locations Although there are five port plugs in the cover of the MBV3-100* only the input test point enables user access (Figure 2-6). The input and output ports provide connection for coaxial cables and are protected by factory-inserted plastic cap plugs. Discard the plastic cap plugs when you install the cable connectors. Figure 2-6 Housing ports Power Supply The lid of the amplifier houses the model MPPS-II 60/90 power pack (Figure 2-7). It provides a regulated 24 VDC output at 2.
Overview 2-7 Figure 2-7 illustrates the MPPS-II installed in the lid of the MBV3-100*. Figure 2-7 MPPS-II power pack The MPPS-II also contains a two position LO/HI selector that sets the start-up voltage for 38 VAC or 55 VAC. The MBV3-100* is shipped with the selector in the LO position which is the standard configuration. The selector should be switched to the HI position only for a 90 VAC system.
2-8 Overview Figure 2-8 illustrates the location of the LO/HI voltage selector and the FTEC surge protector on the MPPS-II. Figure 2-8 MBV3-100* power supply FTEC surge protector LO/HI voltage selector J1 HI LO TP1 R54 TP2 460132-001 You must remove the MPPS-II cover to access the selector illustrated in Figure 2-8. Section 3, “Amplifier Setup” explains changing the setting of this selector to meet system requirements.
Overview 2-9 Factory installed 20-amp fuses, illustrated in Figure 2-9, provide power passing to additional amplifiers. Figure 2-9 Power passing fuse locations Forward Path The operational gain of the MBV3-100* amplifiers is 42 dB with 16 dB of return loss in the forward path. The operating gain includes provisions for the insertion loss of the input cable equalizer and required reserve gain to operate the Bode equalizer in the middle of its range.
2-10 Overview Figure 2-10 illustrates the interconnection between these components in the triple-output MBV3-100*. Figure 2-10 MBV3-100* block diagram Accurate −20 dB directional coupler test points are available at the input and at the output of the amplifier. Because these test points are 75-ohm source impedance, they do not require special test probes. After the output amplifier, a second directional coupler provides signal to the optional VADU or VQADU.
Overview 2-11 Return Path The circuit board of the MBV3-100* amplifier includes the return path. This equips the MBV3-100* to pass signals in the return or upstream direction. The standard circuit board contains all components including the diplex filters, with extended return bandwidth, for the amplifier input and output. Optional SRE-*-* return equalizers compensate for cable attenuation and are available in 1 dB increments for S-split, and 2 dB increments for all other splits, from 0 dB through 12 dB.
2-12 Overview Options and Accessories The factory ships the MBV3-100* as a fully functional unit, but you must configure it appropriately for the field location requirements. You must install the correct forward equalizer or broadband cable simulator and input pad to place the unit in service. Section 3, “Amplifier Setup” provides information to assist you in this task. Use model JXP-*B pads to control field signal levels.
Overview 2-13 Figure 2-11 illustrates the location of options and accessories in the MBV3-100*.
Section 3 Amplifier Setup This section provides instructions on how to properly handle and configure the MBV3-100*. It also describes the proper forward and return path alignment procedures. It is recommended that you read this entire section before you install the MBV3-100*. Proper Handling Procedures The following information is useful in reducing GaAs RF amplifier failures caused by Electrostatic Discharge (ESD) or Electrical Over Stress (EOS). Many electronic components are vulnerable to ESD and EOS.
3-2 Amplifier Setup To successfully setup the MBV3-100*, you need to perform the following tasks: Forward path alignment Return path alignment Check powering and surge protection options Forward Path Alignment You must perform the following MBV3-100* alignment procedures for proper performance in the forward path: Select the appropriate cable equalizer or cable simulator Select the appropriate input, midstage, and output pads Verify proper flatness control Verify proper level co
Amplifier Setup 3-3 Field-sweep the entire bandwidth of the amplifier to correct frequency response for passive signature and roll-off. Close the housing in accordance with the instructions in Section 5, “Installation.” STARLINE Forward Equalizers Select the appropriate model SFE-100-* to compensate for cable attenuation versus frequency and to obtain the proper output tilt.
3-4 Amplifier Setup Substituting this information into the above equation provides the following result: 11 dB + 26.0 dB − 12 dBmV − 14 dB = 11.0 dB The slope of the required equalizer is 11 dB. Table 3-1 and the graph in Figure 3-1 show that 11 dB of slope is caused by approximately 14 dB of cable at 1003 MHz. Therefore, the correct equalizer is model SFE-100-14.
Amplifier Setup 3-5 Figure 3-1 illustrates a graph of the equalizer slope versus equalizer value information presented in Table 3-1. The amount of cable equals the equalizer value. Figure 3-1 Equalizer slope versus cable Slope versus Cable 22 20 18 dB of Cable 16 14 12 1 GHz 10 8 6 4 2 0 0 2 4 6 12 10 8 dB of Equalizer Slope 14 16 18 When selecting an equalizer, choose the next lower value if the exact value is not available or in cases where the calculated value makes two choices possible.
3-6 Amplifier Setup STARLINE Cable Simulators STARLINE cable simulators, model SCS-*, are used in place of fixed equalizers in systems where: (1) the amplifiers are located close together, (2) there are large amounts of flat loss from passive components, or (3) it is necessary to compensate for reverse cable tilt. The simulators fit in the same location as the equalizers. Table 3-2 and Figure 3-2 help you choose the correct simulators.
Amplifier Setup 3-7 The information in Table 3-2 is shown as a graph in Figure 3-2: Figure 3-2 Frequency versus cable slope 1 0 -1 SCS-1 -2 SCS-2 Cable slope (dB) -3 -4 SCS-3 -5 SCS-4 -6 SCS-5 -7 SCS-6 -8 -9 SCS-7 -10 SCS-8 -11 SCS-9 -12 SCS-10 1003 870 750 550 450 400 350 300 250 211 150 108 72 50 45 40 -13 Frequency (MHz) Input, Midstage, and Output Pads Install model JXP-*B pads to attenuate the signal per system design drawings.
3-8 Amplifier Setup Figure 3-3 Flatness controls You can adjust the variable resistors and capacitors on the MDR board to flatten the response across the passband. Use C1, C2, C3, R1, R2, R4, L3, L4, L7, and L8 on the MDR board (illustrated in Figure 3-4) to obtain a flat response. Figure 3-4 MDR/10/1G/* board – top (left), bottom (right) To obtain maximum flatness: 1 On the main board, adjust the variable capacitor C8 (Figure 3-5) to minimum capacitance to place the peak out of the bandwidth.
Amplifier Setup 3-9 Directional Coupler Test Points Accurate −20 dB directional-coupler test points are available at the input and at the output of the MBV3-100*. Because these test points are 75-ohm source impedance, they do not require special test probes. After the output hybrid, a second directional coupler provides signal to the optional VADU or VQADU board. This signal is used only when the VADU or VQADU board is installed.
3-10 7 Amplifier Setup Turn the manual gain reserve (MAN) control (illustrated in Figure 2-12) to maximum (fully clockwise) and then reduce the output as noted in Table 3-3: Table 3-3 Gain reserve versus ambient temperature Temperature 8 Gain Reserve Above 110°F (43°C) 3 dB 32°F (0°C) to 110°F (43°C) 4 dB Below 32°F (0°C) 5 dB Check the amplifier output tilt by measuring the high band- and low band-edge carriers. High = channel 116 (745.25 MHz), channel 136 (865.25 MHz), or channel 158 (997.
Amplifier Setup 3-11 Vertical Automatic Drive Unit/QAM Automatic Drive Unit The VADU and VQADU operate by using surface acoustic wave (SAW) filters to select a pilot frequency and then monitor the amplitude of this frequency. Any change in signal level is fed back to the Bode equalizer. It is assumed that the encountered signal level changes are due to changes in cable attenuation and hybrid output associated with a change in temperature.
3-12 Amplifier Setup 4 Connect a signal-level meter to the FWD OUT test point and tune the meter to the high band-edge carrier. 5 Turn the auto level (VADU) potentiometer (illustrated in Figure 2-11) fully clockwise and then reduce to obtain the level obtained in Step 9 under Manual Gain Control. VADU/VQADU Pads and Levels This subsection provides information regarding the proper VADU/VQADU padding requirements for the MBV3-100*. A JXP-*B pad is installed in the input line to the VADU/VQADU location.
Amplifier Setup Do not use wire jumpers to bypass the SRE-*-* location Perform the return optical link set up before performing amplifier set up Specify reverse alignment design levels for a single carrier Consider sweep equipment as a single carrier and operate at design levels Do not include injection point losses in reverse design levels 3-13 If JXP THERM devices (JXP-TH*C) are specified for level control, they should be installed in the JXP THERM pad facility (illustrated in Figure
3-14 Amplifier Setup Powering and Surge Protection In conventional applications, MBV3-100*s are powered through the input port. CAUTION! To avoid damage to the hybrids, it is recommended that you remove the input pad (JXP-IN) before you apply power to the MBV3-100*. A 20-ampere, blade-type fuse is furnished in the three active ports of the dual output amplifier module and provides overcurrent protection for AC power applied to the input.
Section 4 Bench Testing Motorola’s recommended procedure for placing a new MBV3-100* into service is to fully test it on the bench before it is field installed. There are specific alignment procedures that ensure proper functioning of all components and simplify final installation. If the MBV3-100* is properly aligned on the bench, only minor adjustments may be required in the field. The following subsections provide instructions to bench align the MBV3-100*.
4-2 Bench Testing Test Equipment and Connections The equipment typically used for testing the MBV3-100* consists of a network analyzer, such as the HP 8712 or 8713 series, a 60/90 VAC bench power supply, a cable simulator, a Motorola model SSP-PIN power combiner, and a variety of jumper cables, adapters, and fittings. Fabricate a cable simulator that you can configure to provide the desired cable loss in 1 dB increments up to approximately 30 dB. Then, connect the test equipment as shown in Figure 4-1.
Bench Testing 4-3 Measuring Forward Gain This subsection provides instructions for measuring the full gain and the operational gain and flatness of the MBV3-100*. To measure the full gain of the amplifier: 1 Determine whether the power-supply jumper (J1) is positioned for LO or HI operation. 2 Connect the MBV3-100* to the test equipment as illustrated in Figure 4-1 and apply power. 3 Verify that the DC voltage is 24 V ± 0.4 V and re-install the input pad.
4-4 Bench Testing To measure the operational gain and flatness of the amplifier: 1 Perform steps 1 through 6 in Measuring Forward Gain above. 2 Estimate the ambient temperature and find the required gain reserve by referring to Table 3-3. Reduce the gain at the highest frequency by the amount given in the table. Example: The ambient temperature is 70°F. The table indicates that the required gain reserve is 4 dB. Reduce the gain by 4 dB.
Bench Testing 4 4-5 Measure the gain at the maximum return band frequency (example, 40 MHz for S-split). The amplifier gain is the sum of: the measured gain, the insertion loss of the return cable equalizer at the maximum return band frequency, the insertion loss of the power combiner, any pads installed in either the input or output pad locations, plus the cable simulator loss at the maximum return band frequency. The measured gain must meet advertised specifications for the return amplifier.
Section 5 Installation The field installation procedures presented in the following subsections assume that the amplifier was previously tested and bench aligned. Cable power and RF signal must be available on the system. Although it is preferable to have a full complement of channels available for balancing, you can adjust the MBV3-100* adequately with a limited number of channels. You can install the MBV3-100* on a messenger strand (aerial) or on a pedestal.
5-2 9 Installation Check the AC voltage setting (jumper J1, Figure 2-8). J1 position Description LO The voltage must be greater than 38 VAC as read with a true rms voltmeter or 42 VAC when using a conventional, average reading, AC voltmeter. HI The voltage must be greater than 55 VAC when read with a true rms voltmeter or 61 VAC when using a conventional, average reading, AC voltmeter. 10 Check the DC voltage. Verify that it is between 23.6 V and 24.4 V and reinstall the input pad.
Installation 5-3 Pedestal Installation Pedestal installation is similar to the aerial installation with the exception of temperature and mounting procedure. In an aerial installation, the cable and amplifier are subject to the same temperature. In contrast, pedestal installation provides a stable temperature environment for the buried cable while subjecting the elevated amplifier to higher temperatures.
Section 6 Operating Tips This section describes using amplifiers in lower frequency systems and in lower gain systems. Using Amplifiers in Lower Frequency Systems When using the MBV3-100* in 870 MHz or 750 MHz systems, you must consider the best method for handling the reduced bandwidth and channel-loading requirement. The following information helps you determine the best approach.
Appendix A Specifications Specifications are valid over the given bandpass and operating temperature range of −40°F to +140°F (−40°C to +60°C). Specifications are stated worst case unless otherwise noted, and are subject to change. Refer to the following Motorola web site or contact your account representative for the latest specifications. http://www.motorola.
A-2 Specifications AC Current AC Voltage AC current (rms) 90 VAC 0.81 A 75 VAC 1.0 A 60 VAC 1.3 A 53 VAC 1.45 A 45 VAC 1.7 A 38 VAC 2.0 A Return Amplifier Parameter Specification Passband (S–split) 5 through 40 MHz Gain, station (minimum) 17 dB Flatness ±0.
Appendix B Torque Specifications Torque specifications are valid for all models of the MBV3-100*. In-lbs Torque Ft-lbs N•M 1/2 inch 120-144 10-12 13.6-16.3 5/16-18 1/2 inch 144 12.0 16.3 Test point plugs 5/8-24 1/2 inch 25-40 2.1-3.3 2.8-4.5 Seizure screw #8-32 3/16 inch or Phillips 12 1.0 1.4 Hybrid #6-32 Phillips 10-12 0.8-1.0 1.1-1.4 Chassis (electronics module) #10-32 5/16 inch 18-22 1.5-1.8 2.0-2.
Abbreviations and Acronyms The abbreviations and acronyms list contains the full spelling of the short forms used in this manual.
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