Motorola BT100 Amplifier Level Control, Manual Gain Control, Temperature Gain Reserve

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Amplifier Setup

3-9

attenuation changes due to temperature. If necessary, you can control the Bode board manually using the potentiometer labeled manual level (MAN) in Figure 2-13.

Amplifier Level Control

Signal levels vary in a cable system primarily because cable attenuation changes with temperature. Other components such as passives and amplifier hybrids are also affected by temperature changes. To automatically compensate for these signal level fluctuations and control output level, you must select the optional ADU, QADU, or TDU. The use of the ADU, QADU, or TDU is recommended for improved output level stability.

When necessary and appropriate, you can also use manual gain control. The gain of the BT100 is then determined by the potentiometer marked MAN on the electronics chassis cover.

Manual Gain Control

To use manual gain control:

1Verify that the electronics chassis is installed correctly.

2Ensure that there is continuity in the forward path by installing the design-value forward equalizer and design value input JXP-*B attenuator.

3Ensure that the drive control select jumper is in the MAN position.

4Use a signal-level meter to measure the high band-edge carrier input level at the input test point: 750 MHz = channel 116, 870 MHz = channel 136, 1003 MHz = channel 158.

This carrier should be at standard analog level, non-scrambled.

5Verify that the input level agrees with the design specification input.

If the level is different from design, adjust accordingly. For example: the design level is 19 dBmV at the highest frequency and the design pad value is JXP-3B. If the actual measured level is 21 dBmV, then you must change the pad to a JXP-5B.

If the actual levels are significantly different from the design levels, it is recommended that you investigate or consult system management before proceeding.

6Connect the signal-level meter to the output test point and tune the meter to the high-end channel.

7Turn the manual gain reserve (MAN) control (illustrated in Figure 2-13) to maximum (fully clockwise) and then reduce the output as noted in Table 3-3 below:

Table 3-3

Gain reserve versus ambient temperature

Temperature

 

 

Gain Reserve

°

°

 

3 dB

Above 110 F (43 C)

 

4 dB

° °

°

°

32 F (0 C) to 110 F (43 C)

 

°

°

 

5 dB

Below 32 F (0 C)

 

 

8Check the amplifier output tilt by measuring the high band- and low band-edge carriers.

ƒHigh = channel 116 (745.25 MHz), channel 136 (865.25 MHz), or channel 158 (997.25 MHz).

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 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 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

BT100 specifications

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