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FAQ 148-2002-en

I need help with the level adjustment of T93 equipment.

Which attenuator has to be adjusted first:

  • The small multiturn attenuator?
  • The large attenuator?
  • Why does the T93 have two attenuators?
Respuesta: 

The T93 is a piece of professional equipment.

It features a high gain and a high output power as well as a low noise figure.

Each amplification stage that is preceded by an attenuator makes the noise figure of the system worse.

Therefore the role of each attenuator is very important:

  • The "small" one is an interstage attenuator that hardly increases the amplifier noise figure.
  • Because of this, this is the first attenuator that should be adjusted.
  • The "large" attenuator is used when the gain cannot be reduced to the desirable limit using the small attenuator.

This "large knob" attenuator decreases the noise figure because it is a conventional passive attenuator placed at the input of the amplifier.

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