Motorola BT100 User Manual

This section provides instructions on how to properly handle and configure the BT100. It also 

describes the proper forward and return path alignment procedures. It is recommended that you 

read this entire section before you install the BT100. 

The following information is useful in reducing GaAs RF amplifier failures caused by 

Electrostatic Discharge (ESD) or Electrical Over Stress (EOS). 
Many electronic components are vulnerable to ESD and EOS. Improper handling during service 
and installation can subject the BT100 to performance degradation or failure. All closed 

operational units are equally protected. Compliance with proper handling procedures can 

significantly reduce ESD and EOS related failures. 

To avoid excessive signal level which causes EOS, follow the procedures listed below: 

Proper field procedures include: 

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Installing the system design value forward equalizer and a high value (20 dB or above) 

input pad before you install or remove the electronics chassis or activate the system. This 
significantly reduces RF signal level and avoids possible EOS which can damage the 

hybrids. 

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Leaving the input pad location open if a high value pad is not available. A more accurate 
forward input test point reading is achieved with a high value pad installed. 

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Avoiding handling of the hybrids. If you need to remove or install the hybrids, follow proper 

ESD grounding practices as stated under Bench Setup. 

Proper bench handling practices include: 

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Grounding of the test bench with ESD matting on the work surface and wearing a wrist 

strap connected to a continuous ground monitor checker. These practices are particularly 

important when handling hybrids. 

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Terminating all unused ports with a 75-ohm load. 

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Securing all electronics module cover screws or removing the cover completely. Loose screws 

can cause the BT100 to oscillate and degrade performance. 

To successfully setup the BT100, you need to perform the following tasks: 

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Forward path alignment 

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Return path alignment 

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Check powering and surge protection options