CONNECTORIZED DATA BUS COUPLERS
Data Bus Coupler is the electronic module where the connection(s) between the Stub(s)/ Node(s) and the Data Bus are made. It consists of Bus In, Bus out connections and at least one stub connection. The stub connection is made using a coupling transformer and two fault isolation resistors on the Data Bus end.
The Couplers with connectors directly attached to the Coupler box/case are known as Connectorized Data Bus Couplers.
The purpose of the Data Bus Couplers is to prevent a short on a single stub from shorting the main Data Bus i.e. to isolate the main Bus from the terminals, to reduce reflections and maintain signal impedance levels.
Compupower provides Connectorized Data Bus Couplers with Single, Dual, Four and Six Stubs. These Couplers are available with and without internal terminations.
All resistors are 1Watt per MIL-R-39007 and mounted away from the transformer to minimize heating effects. The transformers are manufactured to MIL-T-21038.
All Couplers are 100% tested and certified.
Features:
- 1Watt Isolation resistors
- 1Watt Terminating resistors
- -55°C to +125°C operating temperature.
Benefits:
- Qualified and type approved for flight applications
- Low cost
- Highly reliable
- Fast delivery
Electrical specifications:
Case |
CRCA steel with Tin plating |
Coupler Module |
Encapsulated with the following components
* Coupler Transformer to MIL-T-21038
* Fault protection Resistors to MIL-R-39007 |
Transformer Turns ratio |
1:1.41 ± 3% (Compliant to MIL-T-21038 Std) |
Input Impedance |
3000Ω Minimum (75KHz to 1MHz) |
Droop |
20% maximum (250KHz) |
Overshoot and ringing |
±1V peak (250KHz square wave with 100ns maximum rise and fall time) |
Common mode rejection |
>45dB at 1.0MHz |
Fault protection |
Resistor in series with each Bus winding connection equal to 59Ω±1%, 1W or 58.5±2%Ω |
Termination |
78Ω±2%, 1W |
Operating Temperature |
-55°C to +125°C |
Storage Temperature |
-55°C to +130°C |
Stub Voltage |
1.0V to 14.0V p-p, line-line |
Connectors type |
BJ 77 (Jack type with socket contact Bayonet coupled – 3 lug) |
Ordering information
Description |
Model No. |
Weight in grams(Max) |
Single Stub Coupler |
DBC 2001 |
90 |
Single Stub Coupler with Terminator |
DBC 2001-TR |
90 |
Dual Stub Coupler |
DBC 1002 |
180 |
Dual Stub Coupler with Terminator |
DBC 1002-TR |
180 |
Four Stub Coupler |
DBC 1004 |
260 |
Four Stub Coupler with Terminator |
DBC 1004-TR |
260 |
Six Stub Coupler |
DBC 1006 |
350 |
Six Stub Coupler with Terminator |
DBC 1006-TR |
350 |
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