The Brandywine Communications IBU-240 is a dual input to 24 output low frequency distribution amplifier specifically designed for distributing IRIG A and B modulated formats (including IEEE 1344 extensions) in a 1U 19” rack mount chassis.  Each of the 24 outputs is transformer coupled and a faithful reproduction of the time code input. Typical input/output levels are 4 VPP with an output impedance of 600 ohms



A three-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 twenty-four outputs is monitored for failure either internally or externally.  Should one of the outputs fail, a group alarm Fault indicator will illuminate on the front panel.  Rear panel input Fault Discrete signals allow external equipment to force the outputs to be derived from either input source in case of a source failure.

Product Specifications
Product Data Sheet
User Manual

Time Code Inputs  
Connector Two rear panel BNC's
Amplitude 4 Vrpp
Input Impedance 600 Ohms, transformer isolated
Frequency 300Hz to 50kHz
Fault Discrete Input  
Number of Inputs 2
Connector DB9
Level TTL
Active Level Link selectable, high or low
Time Code Outputs  
Number of Outputs 24
Connector BNC
Amplitude Same as input
Isolation Transformer coupled
Output Impedance 600 Ohms
Output Protection Short-circuit proof
Fault Sense & Transfer
Modes Automatic and Manual
Manual Selects input A or Input B
Auto Provides automatic switch from A to B should input A fail
Temperature 0 to +50°C
Storage -40 to +85°C
Humidity To 95% non-condensing
Power 115/230 Vac 50/50 Hz, <25W
Optional Power 18-36 Vdc, 36-72 Vdc, -48 Vdc
Dimensions 19" W x 1.73 (1U) H x 14.5" D
Weight 7.5lb typical
EMC Emission to EN50081-1 as EN55022
EMC Immunity To EN50082-1 as EN1000-4-2 ESD, IEC 801-3 HF Field, IEC 801-4 Burst

alt IBU-240 Data Sheet

alt IBU-240 User Manual



About Brandywine Communications

Brandywine Communications Inc. offers superior products to the time and frequency marketplace. Our mission is to provide the finest equipment coupled with excellent before and after sale service.

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Brandywine Communications
Ultra-Precision Time & Frequency

1153 Warner Ave
Tustin, CA 92780
Phone: +1 (714) 755-1050