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Motorola BT100 operation manual Measuring Forward Gain

Models: BT100

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Measuring Forward Gain

4-2	Bench Testing

CAUTION!

To protect the network analyzer, you must configure the SSP-PIN power combiner to block AC power from the input port.

To preserve signal quality, verify that all unused ports are terminated.

CAUTION!

Before you begin the following subsection, remove the input pad (JXP IN) before you apply power. This is necessary to avoid damage to the hybrids.

Measuring Forward Gain

This subsection provides instructions for measuring the full gain and the operational gain and flatness of the BT100.

To measure the full gain of the amplifier:

1Determine whether the power-supply jumper is positioned for 60 V or 90 V operation.

2Connect the BT100 to the test equipment as illustrated in Figure 4-1 and apply power.

3Verify that the DC voltage is 24 V ± 0.4 V and re-install the input pad.

4Apply the sweep signal and adjust test equipment as needed.

5Select manual gain by placing the drive control select jumper in the MAN position and turn the MANUAL LEVEL control (MAN) (Figure 2-13) fully clockwise.

6Measure the gain at mixed forward frequency using the procedure outlined in the operator manual provided with the test equipment in use.

To correct this number, add the insertion loss of the SSP-PIN power combiner (0.6 dB at 750 MHz, 0.7 dB at 870 MHz, or 1.1 dB at 1 GHz), the loss of the cable simulator at mixed forward frequency, and the loss of the cable equalizer (1.0 dB), if it is installed.

Example

The test equipment indicates a measured gain of 24 dB with a BT100 and the cable simulator is set to 20 dB.

1.1dB (power combiner)

+1.0 dB (cable equalizer)

+20.0 dB (cable simulator)

+24.0 dB (measured gain).

46.1dB (unit gain).

The result must meet advertised specifications for the unit.

The operational gain of the BT100 provides reduced gain capability. This enables the unit to operate in the proper region of the Bode board when it is controlled by the ADU or QADU drive units.

To measure the operational gain and flatness of the amplifier:

BT100 Installation and Operation Manual

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Motorola BT100 operation manual Measuring Forward Gain

Contents

Amplifier BT100 1 GHz Broadband TelecommunicationsRecycling your Motorola Equipment Caring for the Environment by RecyclingFCC Compliance Safety StandardsCanadian Compliance International Declaration of ConformityAmplifier Setup ContentsIntroduction OverviewInstallation Bench TestingSpecifications Torque Specifications Abbreviations and AcronymsTables FiguresSection Introduction1-2Introduction Figure 1-2illustrates an open BT100Figure BT100 - open Document Conventions Using This ManualRelated Documentation Issued 04/2005 If You Need HelpTechnical Response Center Inside the U.S. 888-944-HELP Outside the U.SCalling for Repairs Figure BT100 - open OverviewSection 2-2Overview Figure BT100 output-portconfigurationsFigure BT100 ordering guide Ordering GuideFigure BT*-100*/15dimensions - side view HousingFigure BT*-100*/15dimensions - top view Overview2-5 Housing Gaskets Housing port locations and rear view of housing Power SupplyPort Locations 2-8Overview BT100 power supplyFigure Fuse locations Forward Path2-10Overview Figure BT100*-4*four output block diagramBT100*-3*three output block diagram Return PathFigure LL-BTA-HMSstatus monitor Ingress Control SwitchModel Options and AccessoriesDescription FunctionModel Figure BT100 Options and AccessoriesDescription FunctionProper Handling Procedures Amplifier SetupBench Setup Field PracticeBefore You Begin Forward Path AlignmentSTARLINE Forward Equalizers Equalizer Frequency MHz versus Insertion Loss dB1003 ValueCable slope in dB STARLINE Cable SimulatorsFrequency Figure Frequency versus cable slope Input, Midstage, and Output PadsFigure Flatness controls Flatness ControlBode Equalization Directional Coupler Test PointsAmplifier Level Control TemperatureManual Gain Control Gain ReserveThermal Drive Unit Automatic Drive Unit/QAM Automatic Drive Unit Before You Begin Return Path AlignmentADU/QADU Pads and Levels Alignment Procedure Powering and Surge Protection Before You Begin Bench TestingTest Equipment and Connections SectionMeasuring Forward Gain Testing Return Gain and Response Completing the Test Procedures Section InstallationAerial Installation Jumper position Description Grounding the BT100 Pedestal InstallationUsing Amplifiers in Lower Gain Systems Using Amplifiers in Lower Frequency SystemsOperating Tips SectionSpecification SpecificationsModel BT100 Forward AmplifierRA-Kit/HReturn Amplifier AC CurrentADU/QADU Automatic Drive Unit AC VoltageTorque Torque SpecificationsFastener Screw SizeAbbreviations and Acronyms 2/07 Visit our website at527550-001-a