Amplification
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Amplification
An RF amplifier takes the signal that is generated by the transceiver, increases it and send it to the antenna.
This is achieved by adding electrical energy to the signal also know as active gain.
Types of amplifiers
Unidirectional: Amplify in one direction, either transmitting or receiving.
Bidirectional: Amplify in both directions, transmitting and receiving.
Increase in power:
The main purpose of using amplifiers is to compensate for cable loss as opposed to boosting the signal for range.
Because antenna cables add loss to the signal, a shorter antenna cable will produce less loss and allow more signal to the antenna.
It is important to note that an amplifier increases the noise as well as signal strength.
It is not uncommon for an amplifier to raise the noise floor by 10dB or more.
Installation
When installing an amplifier, install it as close to the antenna as possible.
Amplifiers must be certified with the system in use. If an amplifier is added to wireless network and it has not been certified, then it is illegal.
An RF amplifier takes the signal that is generated by the transceiver, increases it and send it to the antenna.
This is achieved by adding electrical energy to the signal also know as active gain.
Types of amplifiers
Unidirectional: Amplify in one direction, either transmitting or receiving.
Bidirectional: Amplify in both directions, transmitting and receiving.
Increase in power:
- Fixed-Gain
- Output of the transceiver is increased by the amount of the amplifier
- Fixed-Output
- Does not add to the output of the transceiver
- Generates a signal equal to the output of the amplifier regardless of the power generated by the transceiver.
The main purpose of using amplifiers is to compensate for cable loss as opposed to boosting the signal for range.
Because antenna cables add loss to the signal, a shorter antenna cable will produce less loss and allow more signal to the antenna.
It is important to note that an amplifier increases the noise as well as signal strength.
It is not uncommon for an amplifier to raise the noise floor by 10dB or more.
Installation
When installing an amplifier, install it as close to the antenna as possible.
Amplifiers must be certified with the system in use. If an amplifier is added to wireless network and it has not been certified, then it is illegal.
Reference:
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.
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