Motorola BT100 operation manual Alignment Procedure

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Amplifier Setup

3-13

ƒReverse signal generator — must produce at least one signal within the return bandpass and have variable output

ƒReturn sweep or alignment equipment

It is recommended that you:

ƒDo not remove or install the electronics chassis cover when the BT100 is powered

ƒDo not use wire jumpers to bypass the SRE-100-* location

ƒPerform the return optical link set up before performing amplifier set up

ƒSpecify reverse alignment design levels for a single carrier

ƒConsider sweep equipment as a single carrier and operate at design levels

ƒDo not include injection point losses in reverse design levels

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 2-13) prior to alignment.

Alignment Procedure

The return amplifier configuration includes one high-gain (30 dB) return amplifier hybrid, and an appropriate SRE-100-* equalizer. All components are plug-in and are easily installed.

To align the return path:

1If the BT100 is powered, remove all fuses before you perform the following steps.

2Install the design value pad in the return output pad location (JXP) which is located directly beneath the JXP THERM.

3Install the design value return equalizer, SRE-100-*, in the location “RTN EQ”.

4Verify that the return input pad locations (JXP, JXP 1, JXP 3, and JXP 4) have 0 dB pads (or JXP-ZX jumpers) installed.

5If you require ICSs, install them in the ICS locations illustrated in Figure 2-13. If you plan to install the ICSs later, install JXP-2Bs to simulate the through-loss of the ICSs. This eliminates the need to rebalance the return path if you install the ICS later.

6Verify that the return pad (JXP location located to the right of the return hybrid) has a 0 dB pad (or JXP-ZX jumper) installed.

7Verify that the return thermal pad socket (JXP THERM), located between the hybrid output and the SRE-100-*, has a 0 dB pad (or JXP-ZX jumper) or a JXP-TH*C installed.

8Set the sweep equipment output level to the amplifier’s design input level. Add insertion point loss.

9If required, change the return output pad and/or equalizer to achieve, as close as possible, a match of the reference level as compared to the node.

10Verify the sweep response of all insertion points, if applicable.

11Verify that the pad and equalizer values are similar to the map design values.

For systems that must meet especially stringent return-path flatness requirements, you may need additional flatness response correction in the return path. You can obtain additional flatness by installing the JXP-RPC board in one of the return-path JXP pad facilities. The recommended location is the JXP-THERM pad facility. However, if you are using JXP-THERMS in the return

BT100 Installation and Operation Manual

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Contents Installation Special Symbols That Might Appear on the Equipment FCC Compliance Contents Specifications Bench TestingInstallation 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 Bench Setup Amplifier SetupProper Handling Procedures 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 EqualizationManual Gain Control Temperature Gain ReserveAmplifier Level Control Thermal Drive Unit Automatic Drive Unit/QAM Automatic Drive Unit Return Path Alignment ADU/QADU Pads and LevelsAlignment Procedure Powering and Surge Protection Test Equipment and Connections Bench TestingBefore You Begin Measuring Forward Gain Testing Return Gain and Response ExampleCompleting the Test Procedures Installation Aerial InstallationJumper position Description Torque sequencePedestal Installation Grounding the BT100Operating Tips Using Amplifiers in Lower Frequency SystemsUsing Amplifiers in Lower Gain Systems Model BT100 SpecificationsSpecification Forward AmplifierRA-Kit/H Return Amplifier Parameter SpecificationAC Current ADU/QADU Automatic Drive UnitTorque Specifications Torque Fastener Screw Size Wrench Size In-lbsAbbreviations and Acronyms CTBVisit our website at 527550-001-a

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