Overview
The Racal Instruments 1260-75B (part number 407354-002) is a high-performance RF multiplexer module for VXI-based test systems. This module contains sixteen 1×4 75Ω multiplexer circuits configurable via software, delivering 100 MHz bandwidth with usable performance to 200 MHz. The 1260-75B is designed for rapid, reliable switching of high-frequency signals in automated test equipment.
Key Features
- Sixteen 1×4 75Ω multiplexer circuits (configurable as eight 1×9, four 1×19, two 1×39, or one 1×79)
- 100 MHz rated bandwidth, usable to 200 MHz for wideband RF switching
- Bi-directional, software-configurable architecture for flexible signal routing
- Excellent isolation and crosstalk specifications for clean signal integrity
- Standard VXI C-size single-slot form factor for plug-and-play integration
- Relay-based switching with individual channel control via Control Registers
Technical Specifications
- Impedance: 75 Ω
- Bandwidth: 100 MHz (rated), usable to 200 MHz
- Channel Configuration: Sixteen 1×4 multiplexers (bi-directional)
- Maximum Switchable Voltage: Rated for DC and AC signal levels (see datasheet for limits)
- Maximum Switchable Power: 10 W DC, 10 VA, 10 W RF into 75 Ω
- Maximum Carry Current: 1 A DC, 1 A AC peak
- Path Resistance: ≤2 Ω
- Module Form Factor: VXI C-size, single-slot
- Part Number: 407354-002
- Control Interface: Message-based (Option 01) or register-based (Option 01T)
Typical Applications
- Wideband RF signal switching and routing in automated test systems
- Video and pulse signal multiplexing for oscilloscopes and function generators
- Spectrum analyzer and network analyzer signal switching
- High-frequency test matrix expansion in VXI chassis-based systems
- Distortion analyzer and universal counter/timer signal distribution
Compatibility & Replacements
Compatible With
- VXI bus architecture and controllers supporting C-size modules
- Racal Instruments 1260 series test systems and VXI mainframes
- Function/pulse generators with 75Ω signal sources
- Oscilloscopes and spectrum analyzers with 75Ω termination
- Racal Option 01 (message-based) and Option 01T (register-based) control modules
Replaces / Drop-In Replacement For
- 407354-002 (original Racal part number)
- 1260-75B units from earlier manufacturing batches with identical pinout and control protocol
Works With
- VXI message-based and register-based control protocols
- Racal Instruments control software and firmware
- Standard VXI trigger and timing signals
- 75Ω coaxial connectors and RF cable assemblies
- Test equipment using VXI switching and routing architectures
