Motorola MB87 specifications Backward Compatibility, Forward Path, Return Path

BACKWARD COMPATIBILITY

The MB87 electronics package can be made backward compatible with the 10 -Amp MB*/* housing by installing the MB - 15A Kit or the MB-15A Kit II. These kits contain 50 mil gold plated platform assemblies. This makes it possible for the amplifier to carry 15 Amperes continuous through the input or out put ports.

FORWARD PATH

The operational gain of the MB87 is 34 dB or 40 dB depending on model, with 15 dB return loss. Output level control is achieved through the use of an interstage Bode equalizer, which compensates for coaxial cable attenuation cha nges due to temperature. Equalization may be controlled manually, with a thermal drive unit (model TDU) or with a single pilot closed loop automatic drive unit (model ADU -* or QADU). Both the TDU and the ADU boards are common to the STARLINE family of amplifiers (with the exception of the SLE) . ADUs utilize Surface Acoustic Wave (SAW) filters for determining pilot frequency. This improves amplifier stability over temperature.

To further ensure system flexibility, installation ease and maintenance, the am plifier is engineered for compatibility with standard accessories, such as attenuators, equalizers, ADUs or TDUs, return amplifiers, automotive fuses and FTEC - BTA crowbar circuits.

For an optional third output, the MB87 utilizes splitters (model SP) and directional couplers (model DC/*). The SP, DC/8, DC/10, and DC/12 offer superior performance to 1 GHz.

The MB87 uses modular diplex filters, which can be changed for a different frequency split as required. The amplifier is available with S-split filters for a 5-40 MHz return and a 52-870 MHz forward band. K-splits (5-42 MHz/54-870 MHz), J- splits (5-55 MHz/70-870 MHz), and A-splits (5-65 MHz/85-870 MHz) are also available. These same filters can be used for all US-style Motorola RF distribution amplifiers (models BLE, MB/MBE, BT).

RETURN PATH

High gain return amplifier kits can be ordered which provide 20 dB minimum station gain. Return path equalizers from 0 to 12 dB can be customer selected. Optional features include thermal compensation and ingress con trol switching. Thermal compensation comes in the form of a plug -in JXP-TH*C, which stabilizes gain and match over temperature extremes.

Also available is Ingress Control Switching (ICS) in 3 states. This pin diode attenuator circuit can lower levels by 6 dB or by 38 dB with a controlled slew rate for minimum bit errors. The dual output MB*/* requires two ingress control switches when ordering this option (one ICS required for each output). The LIFELINE® MiniBridger Amplifier transponder, model LL-MB-HMS-*/*, is required to operate the Ingress Control Switch from a remote location.

Model Availability

To reduce customer costs and to accommodate customer specific needs, the STARLINE MB87 can be ordered in a variety of different models. Please refer to the MB87 ordering information below for options.

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Motorola, Inc.
Connected Home Solutions
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Rev. 1.0	© Motorola, Inc. 2003
09.01.05	Specifications are subject to change without notice.