Motorola BT100 operation manual Starline Forward Equalizers, Example

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Amplifier Setup

3-3

STARLINE Forward Equalizers

Select the appropriate model SFE-100-* to compensate for cable attenuation versus frequency and to obtain the proper output tilt. The BT100 is equipped with the BDR-1G interstage equalizer and flatness board, which compensates for cable attenuation. You must compensate for any cable or passive slope beyond that of the BDR-1G by selecting and installing the appropriate SFE-100-* cable equalizer.

Equalizers are available in 1 dB steps from 0 dB to 22 dB. The following examples describe how to choose the correct equalizer.

Example 1

The amplifier location includes 20 dB of cable (at 1 GHz) between its input and the preceding amplifier. Consider cable loss only. Exclude any flat loss due to splitters or other passive devices. The internal equalizer, model BDR-1G, compensates for approximately 14 dB of cable. Subtract this cable length from the 20 dB of this example (20 − 14 = 6). The SFE-100-6 is the proper equalizer in this case. With this equalizer installed, the amplifier reproduces the output tilt of the last upstream amplifier.

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.

Example 2

The BT100 amplifier is used in a link following a fiber node. The fiber receiver output is flat and connects to the input of the amplifier through 18 dB of cable plus passive loss. Determine which is the proper equalizer to achieve 11 dB output tilt from the BT100.

Calculate the equalizer value using the following equation:

 

SLOPEeq

= TILTout + SIGlo – SIGhi – SLOPEieq

where:

SLOPEeq

= required SFE-100-* slope

 

TILTout

= required amplifier output tilt

 

SIGlo

= signal input level at 54 MHz (channel 2)

 

SIGhi

= signal input level at 1 GHz

 

SLOPEieq

= interstage equalizer slope (14 dB)

From various references, such as manufacturer’s catalogs, you can determine that at an operating frequency of 1003 MHz, 18 dB of cable produces approximately 3.6 dB of loss at 54 MHz. This suggests that the channel 2 signal input to the BT100 is 14.4 dB greater

(18 − 3.6 = 14.4) than it is at 1003 MHz. Our example assumes that the high-end frequency level into the BT100 is +12 dBmV.

Substituting this information into the above equation provides the following result: 11 dB + 26.4 dB − 12 dBmV − 14 dB = 11.4 dB

The slope of the required equalizer is 11.4 dB. Table 3-1 and the graph in Figure 3-1 show that

11.4dB of slope is caused by approximately 14 dB of cable at 1003 MHz. Therefore the correct equalizer is model SFE-100-14.

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.

BT100 Installation and Operation Manual

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Contents Installation Special Symbols That Might Appear on the Equipment FCC Compliance Contents Bench Testing InstallationSpecifications Torque Specifications Abbreviations and AcronymsFigures TablesIntroduction Illustrates a closed BT100Illustrates an open BT100 Using This Manual Related Documentation Document ConventionsIf You Need Help Technical Response CenterCalling for Repairs Overview Illustrates the various output-port configurations Ordering Guide Identifies and describes the model stringsHousing Overview2-5 Housing Gaskets Illustrates the housing gasketsPower Supply Port LocationsBT100 power supply Forward Path BT100*-4* four output block diagram Return Path Ingress Control Switch Options and Accessories Model Description FunctionJXP-RPC Amplifier Setup Proper Handling ProceduresBench Setup Field PracticeForward Path Alignment Before You BeginStarline Forward Equalizers ExampleStarline Forward Equalizers SFE-100 Starline Cable Simulators SCS Frequency Cable slope in dBInput, Midstage, and Output Pads Information in -2 is shown as a graph in FigureFlatness Control Directional Coupler Test Points Bode EqualizationAmplifier Level Control Temperature Gain ReserveManual Gain Control Thermal Drive Unit Automatic Drive Unit/QAM Automatic Drive Unit Return Path Alignment ADU/QADU Pads and LevelsAlignment Procedure Powering and Surge Protection Before You Begin Bench TestingTest Equipment and Connections Measuring Forward Gain Testing Return Gain and Response ExampleCompleting the Test Procedures Installation Aerial InstallationJumper position Description Torque sequencePedestal Installation Grounding the BT100Using Amplifiers in Lower Gain Systems Using Amplifiers in Lower Frequency SystemsOperating Tips Specifications SpecificationModel BT100 Forward AmplifierParameter Specification AC CurrentRA-Kit/H Return Amplifier ADU/QADU Automatic Drive UnitTorque Specifications Torque Fastener Screw Size Wrench Size In-lbsAbbreviations and Acronyms CTBVisit our website at 527550-001-a

BT100 specifications

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