The Astronics / EADS / Racal 1260-35A is a high-density multiplexer module designed for VXI platforms in aerospace and defense test applications. This single-slot, C-size module delivers flexible signal routing through user-configurable two-wire, four-wire, and one-wire scanner topologies, supporting up to 250 VDC or VAC rms per channel at 1 A maximum with 30 W DC or 62.5 VAC per-channel switchable power. The module operates at 50 MHz bandwidth with low thermal offset, making it suitable for continuity testing, audio switching, and telephone line applications requiring high channel density in minimal physical space.
## Technical Specifications
• **Bandwidth:** 50 MHz
• **Voltage Rating:** Up to 250 VDC or VAC rms per channel
• **Current Rating:** Up to 1 A per channel
• **Maximum Switchable Power:** 30 W DC, 62.5 VAC per channel
• **Capacitance (Open Channel):** < 600 pF
• **Insertion Loss:** < 0.1 dB at 100 kHz (1 × 6 configuration)
• **Crosstalk:** < −90 dB at 100 kHz
• **Thermal Offset:** Low
• **Weight:** 3.07 lb (1.33 kg) without Option 01/01T
• **Cooling Requirement:** 4.0 l/s airflow
## Key Features
• User-configurable into multiple topologies: one 1×96, two 1×48, four 1×24, eight 1×12, or sixteen 1×6 two-wire multiplexers; one 1×48, two 1×24, four 1×12, or eight 1×6 four-wire multiplexers; one 1×192 one-wire scanner (with additional relay)
• Message-based control via optional Smart Card (Option 01)
• Register-based operation with parallel relay control for 4-wire configurations
• Relay coil current monitoring for confidence checking
• Crimp pin type user connectors (1260-35A) or ribbon cable mating connectors (1260-35)
• Single-slot, C-size VXI form factor
## Typical Applications
• Continuity testing
• Audio and telephone line switching
• Signal routing in multi-channel test systems
• Aerospace and defense test environments
## Compatibility & Integration
• VXIbus compatible
• Astronics LBus Revision C/F Local Control Interface
• Legacy Racal Instruments infrastructure support
