The Racal Instruments 1260-75A is a modular RF multiplexer designed for high-frequency signal routing in test systems. It houses eight independent 1×4, 75-ohm multiplexers operating bi-directionally up to 200 MHz, with software configurability eliminating the need for physical reconfiguration. Control is achieved via Racal’s Option 01 message-based interface or Option 01T message-based and register-based interface, making it suitable for integration with function generators, universal counters, timers, and oscilloscopes in video and fast-pulse signal applications.
Technical Specifications
RF Performance:
• Signal bandwidth: up to 200 MHz (usable over 200 MHz)
• Bandwidth (-3 dB): 100 MHz
• Path resistance: ≤2 Ω
• Insulation resistance: ≥2×10⁹ Ω
• Thermal EMF: <75 µV
Switching Ratings:
• Maximum voltage (signal-signal ground, resistive load): 200 V DC or 200 V AC peak
• Maximum switchable current per channel: 0.5 A DC, 0.5 A AC peak
• Maximum carry current: 1 A DC, 1 A AC peak
• Maximum switchable power per channel: 10 W DC, 10 VA, 10 W RF into 75 Ω
Hardware Configuration:
• Module type: C-size, single-slot VXIbus
• Weight (without Option 01): 2.49 lb (1.17 kg)
• Weight (with Option 01): 2.87 lb (1.29 kg)
– Key Features
• Eight bi-directional 1×4 multiplexers in single module
• Software-configurable relay control without disassembly
• Relay coil current monitoring for confidence checking
• Coaxial connector housings and interfaces available
• Optional coaxial cables tested to 1 GHz bandwidth (2, 6, and 12-foot lengths)
• Register-based control enables simultaneous operation of all eight channels with single bit per relay
– Typical Applications
• Video signal switching in automated test systems
• Fast-pulse signal routing and multiplexing
• High-frequency measurement setups requiring dynamic channel selection
• Multi-channel RF signal distribution
– Compatibility & Integration
Designed for integration into VXI-based test platforms. Controlled through message-based or message/register-based programming interfaces. Compatible with function generators, universal counter/timers, and oscilloscopes.
