24 Output Frequency Distribution Amplifier

The Brandywine Communications Model FDU-240 is a 2 input and 24 output frequency distribution amplifier that offers modern, often requested and reliable features. The base unit outputs twenty-four 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.


Model NumberDescriptionOscillator TypePower SupplyForm FactorPower TypeOutput FormatNo. of OutputsInput FormatNo. of Inputs
FDU-240Multi-Channel Frequency Distribution UnitOCXOSingle AC1UAC10 MHz2410 MHz2
FDU-240-PLL24 Channel Frequency Distribution Unit with PLLOCXO PLLSingle AC1UAC10 MHz2410 MHz2
FDU-240-2PLL24 Channel Frequency Distribution Unit with 2 PLLOCXO 2PLLSingle AC1UAC10 MHz2410 MHz2
FDU-240-5MMulti-Channel Frequency Distribution Unit 5 MHzOCXO PLLSingle AC1UAC5 MHz245 MHz2
FDU-240-2PLL-5M24 Channel Frequency Distribution Unit with 2 PLL 5 MHzOCXO 2PLLSingle AC1UAC5 MHz245 MHz2
FDU-240-5M-10M24 Channel Frequency Distribution Unit 5 MHz in, 10 MHz OutOCXOSingle AC1UAC10 MHz245 MHz2


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


Reference Frequency Inputs
Connector Type Two rear panel BNC's
Input Amplitude 0.5Vrms – 1Vrms
Input Impedance 50 Ohms
Frequency 10 MHz
Fault Inputs
Number of Inputs 2
Connector Type DB9
Levels TTL
Active Level Link selectable, high or low
Sine Wave Outputs
Number of Outputs 24
Connector Type BNC
Frequency Same as input
Output Level +13 dBm, ± 2 dBm into 50 Ohms
SSB Phase Noise (with clean-up oscillator option)
Offset dBc/Hz
1 Hz -60
10 Hz -110
100 Hz -140
1 kHz -150
10 kHz -155
Harmonics 30 dBc
Spurious -80 dBc
Without Cleanup Option Same as input
With Cleanup Option 5E-7 per year
Power 115/230 Vac 50/50 Hz
Power Consumption <25 W
Operating 0 to +50°C
Storage -40 to +85°C
EMC Emmission To EN50081-1 as EN55022
EMC Immunity To EN50082-1 as EN1000-4-2 ESD, IEC 801-3 HF Field, IEC 801-4 Burst
Humidity To 95% non-condensing
Dimensions 19 inch Rack Mount, 1.73 inches high (1U), 14.5 inches deep
Weight 7.5 lb typical

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