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General Instrument STARLINE MB-750D-H, Руководство по установке

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Overview

5

MB-750D-H and MB-750D-H/40 Installation Manual

Figure 2
Mini-Bridger amplifier module, showing location of accessories

Assemblies and Modules

This section describes each of the major components and subassemblies associated with the
MB-750D-H and MB-750D-H/40 Mini-Bridgers.

Housing Model MB-HSG/60

The purpose of the housing is to protect the electronics from the elements and serve as a radiator
to dissipate the internally generated heat.  While the amplifiers are shipped with the model
MB-HSG/60 housing, they can also be installed in an existing XLE-HSG housing.

Both housings can be strand mounted by using the included clamp and bolt assemblies, or
surface mounted by using suitable auxiliary brackets.  In addition, two 1/4 × 20 threaded holes
are provided in the lower housing half for pedestal or surface mounting.

Each housing is equipped with a combination woven-wire/silicone-rubber gasket between the
body and the cover for efficient ground continuity, RF shielding and weather protection.  The
input and output ports are protected by factory inserted plastic cap plugs which are discarded
when the cable connectors are installed.

Model MPPS Power Pack

The model MPPS power pack is mounted within the cover of the amplifier housing.  It provides
24 Vdc output at 2.0 amperes maximum over an ac input voltage range from 38 Vac to 60 Vac
rms.  The waveshape of the input voltage may be either a squarewave or a sinewave.  The surge
arrestor and the EMI filter protect the power pack and amplifier from transient spikes.
Additional surge protection is built into the power pack by a fast acting zener diode.  A 5 amp
fast-blow fuse in the ac line offers further protection in case of catastrophic power pack failure.

Содержание STARLINE MB-750D-H

Страница 1: ...SPLIT JXP RET OUT AUTOMATIC CONTROL BOARD RETURN EQUALIZER SEE RESPONSE CORRECTION MDR EQ IN 3 XO 36 4 DUAL HYBRID POWER DOUBLING MINI BRIDGER 2 General Instrument GI EQUALIZER MDR 750 10 C80 C81 C82...

Страница 2: ...d to make changes in content from time to time without obligation on the part of General Instrument to provide notification of such revision or change General Instrument provides this guide without wa...

Страница 3: ...ls MBD SPLT and MBD DC 8 Return Signal Path 8 Forward Output Level Control 9 Power Control Options 9 Automatic Control Board 9 Preinstallation Procedures 11 Configuring the MB 750D H 11 Forward Equali...

Страница 4: ...SS 26 List of Figures Figure 1 MB 750D H and MB 750D H 40 Mini Bridger block diagram 4 Figure 2 Mini Bridger amplifier module showing location of accessories 5 Figure 3 Block diagram of MPPS power pa...

Страница 5: ...ained in this manual lists related documentation and gives the helpline telephone number Section 2 Provides a detailed description of the various components used in the amplifier It also provides inst...

Страница 6: ...r Repairs If repair is necessary call the General Instrument Repair Facility at 1 800 642 0442 for a Return for Service Authorization RSA number before sending the unit The RSA number must be prominen...

Страница 7: ...dgers eliminates the need for intermediate amplifiers normally required to modify a tree and branch system into a fiber to the feeder architecture The attenuation of coaxial cable as used in CATV syst...

Страница 8: ...scription MB ACB Auto control board module Provides automatic output level control RA Kit 40L Return amplifier kit Implements two way service EQP1 1 Equalizer circuit board Used for test purposes or w...

Страница 9: ...rovided in the lower housing half for pedestal or surface mounting Each housing is equipped with a combination woven wire silicone rubber gasket between the body and the cover for efficient ground con...

Страница 10: ...ed against overcurrent and short circuits thus providing a precise output voltage If a short circuit is detected the power supply shuts down and the regulator initiates a sequence of line test pulses...

Страница 11: ...options Intermediate amplifier stages are comprised of several circuits One interstage circuit is the Bode equalizer which is a voltage controlled device that receives its input from the manual gain c...

Страница 12: ...le the MBD DC provides one high level port and one low level port The MBD DC may be installed to provide the high level signal to either port three or to port four Return Signal Path The MB 750D H amp...

Страница 13: ...mbient temperature changes This attenuator is flat and supplements the attenuation changes performed by the Bode equalizer In buried plant installations the JXP THERM can be left in place and it will...

Страница 14: ...f the connector Loosen the screws holding the cover in place and remove the cover Component locations are now accessible Forward Equalizer Model EQ 750 Cable equalizers are selected to compensate for...

Страница 15: ...This suggests that the channel 2 signal input to the MB 750D H amplifier is 13 6 dB greater 18 4 4 13 6 at channel 2 than at 750 MHz Our example assumes that the high end frequency level into the amp...

Страница 16: ...four then the proper output splitter must be installed Installation of the MBD SPLT splitter provides equal output at ports three and four If unequal outputs are desired use of the MBD DC a 10 dB dir...

Страница 17: ...r in the OFF LO or HI position The MB ACB as supplied is tuned to the channel which is to be used as the pilot frequency This channel must be present on the system continuously and may be modulated or...

Страница 18: ...lure to do this will likely result in a damaged termination and the consequence may be a misaligned amplifier Installing DF1 SS 40 Diplex Filters Existing MB 750D H amplifiers can be equipped with the...

Страница 19: ...the adjacent connector The wire which connects to the output connector should also be dressed as close to the circuit board as possible The components involved in this procedure are illustrated to the...

Страница 20: ...the bench For example if the amplifier will be installed in a location that will include 20 dB of cable between the previous amplifier and the unit under test sweep through a length of cable that exh...

Страница 21: ...erves versus temperature Required Gain Reserve Degrees Celsius Degrees Fahrenheit 7 0 dB 29 20 6 0 dB 12 10 5 0 dB 4 40 4 0 dB 21 70 3 0 dB 35 95 2 0 dB 49 120 Flatness The output of the amplifier at...

Страница 22: ...l gain of the unit can be measured Refer to Appendix A Specifications for proper operational gain values The amplifier s gain is the measured gain plus the sum of all losses including the power combin...

Страница 23: ...of 70 F Level would be set by use of the following procedure 44 4 gain reserve at 70 F Table 2 48 dBmV Reduce the output level by the gain reserve value shown in Table 2 for the appropriate ambient t...

Страница 24: ...t connectors Pin type connectors with a nominal center conductor diameter of 067 inches are required The pin length of the center conductor is 1 50 inches minimum and 1 65 inches maximum as measured f...

Страница 25: ...ier includes setting the output signal level setting the output tilt and checking the flatness of response Both the input and the output test points are 75 Ohm source impedance and 20 dB below actual...

Страница 26: ...all the proper input pad Replace the module cover and repeat step 3 Output tilt i e the difference in signal level between channel 2 and the high end can be measured through the specially prepared tes...

Страница 27: ...lected should be installed at the input of the amplifier and is located in the upper left near the forward cable equalizer Adjust the LEVEL control on the MB ACB board to achieve the desired output le...

Страница 28: ...2 to 750 MHz Minimum full gain at 750 MHz 39 dB Operational gain at 750 MHz 35 dB Flatness 0 75 dB Gain control range 8 dB Noise figure at 52 MHz 13 dB at 750 MHz 11 5 dB Return loss 14 dB Test points...

Страница 29: ...3 watts Return Amplifier Kit RA Kit 40L Parameter Specification Passband 5 to 40 MHz Minimum full gain 21 dB Maximum noise figure w o equalizer 6 dB DC supply 24 V 125 mA AC requirement at 52 Vac 08...

Страница 30: ...27 Specifications MB 750S H 40 E Mini Bridger Installation Manual...

Страница 31: ...General Instrument Corporation GI Communications Division Printed in U S A 436 915 200 4 95...

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