The Excalibur Systems ESI-125-1-176-039 is a MIL-STD-1553B in-line coupler cable engineered for airborne data bus applications requiring high-fidelity signal transmission in confined spaces. This internally terminated stub configuration delivers 1 meter (39 inches nominal) individual wire lengths with a total assembly length of 41.400 inches, meeting stringent MIL-STD-454 construction and workmanship standards.
## Technical Specifications
**Electrical Performance**
• Frequency range: 75 kHz to 1.0 MHz
• Common mode rejection: -45.0 dB minimum @ 1.0 MHz
• Transformer ratio: 1:1.41 ±3%
• Droop: 20% maximum @ 250 kHz
• Overshoot and ringing: ±1.0 V peak
• Dielectric strength: 500 Vrms (shield-to-bus and bus-to-stub)
• Insulation resistance: >1000 Megohms @ 250 VDC
**Internal Termination**
• R1–R2: 59 Ohms, 1%, 1 W
• R3: 78 Ohms, 1%, 1 W
• Isolation resistors rated 1 W minimum
**Mechanical & Environmental**
• Operating temperature: -55°C to +125°C
• Cable pull strength: 12 lbs. steady load (each wire)
• Metal enclosure with flame-, acid-, and fluid-retardant covering
• Conforms to M17/176-00002 cable specification
**Qualification Testing**
• Dielectric withstand: MIL-STD-202 method 301; 500 VAC, 2 mA leakage maximum
• Insulation resistance: MIL-STD-202 method 302; 250 VDC, ≥1000 MOhms
• Life: MIL-STD-202 method 108; 1000 hours @ 125°C
• Vibration: MIL-STD-202 method 204, condition B; 12 hours per axis
• Shock: MIL-STD-202 method 213, condition I
• Thermal shock: MIL-STD-202 method 107, condition B; -65°C to 125°C, 10 cycles
• Moisture resistance: MIL-STD-202 method 106; 10 cycles
• Altitude: MIL-STD-202 condition B; 0 to 40,000 feet
## Key Features
• Single stub, internally terminated configuration minimizes footprint
• 1:1.41 transformer ratio enables efficient impedance matching across the 75 kHz–1.0 MHz band
• Precision 1% resistor tolerances ensure predictable signal conditioning
• Military-grade construction validated across temperature extremes and environmental stressors
• Proven F-18 fighter aircraft integration
## Typical Applications
• In-line data bus coupling for MIL-STD-1553B systems in space-constrained avionics installations
• Test equipment and simulator interfaces requiring single-stub termination
• Airborne platforms demanding reliable signal isolation and common-mode rejection
## Compatibility & Integration
Designed for MIL-STD-1553B data bus systems. Compliant with M17/176-00002 cable specification. Internal termination and transformer ratio eliminate the need for external coupling networks in stub configurations.
