FDU-240
Frequency Distribution Unit

The FDU-240 provides 24 outputs (5MHz or 10MHz) and has optional clean-up OCXO with low phase noise outputs. The unit is also available as a transfer switch.

  • 5 MHz or 10 MHz Outputs
  • Available Reference Frequency Input Option
  • Auto Changeover with Ref. Input Option
  • Low Phase Noise Outputs
  • 24 Outputs
  • Front Panel Status Indicators
  • Fault Discrete Inputs Compact 1U, 19” rack mount

The FDU-240 offers modern, often requested and reliable frequency distribution features. The base unit outputs 24 sine waves that are input directly from the rear panel to the transfer switch.

For enhanced phase noise performance an optional clean up oscillator is positioned between the rear panel inputs and the inputs of the transfer switch. A clean-up oscillator may be installed between both Input A and Input B inputs or only on Input A.

A 3-position front panel switch chooses automatic operation or may be used to manually select one of the two input sources. When the AUTO mode is selected the AUTO indicator will be illuminated and Input A will be used if it is available. Should Input A fail, Input B will be chosen automatically. Indicators show the status of the inputs and which input has been selected.

Each of the 24 outputs is monitored. Should an output fail a group alarm Fault indicator will illuminate. A front panel Power indicator is also provided.

Rear panel input Fault Discrete signals allow external equipment to force the outputs to be derived from either input source.

When fitted with the optional clean up oscillators stability of the outputs is the same as that of the input(s). This is accomplished by disciplining the clean up oscillator(s) to the reference input(s). The ability to choose clean up oscillators on one or both inputs enables the user to perform cost-performance trade offs not available in other products.

Applications for the Model FDU-240 include reliable signal distribution in systems designed for satellite ground stations, secure military communications and range timing.