The HP/Agilent 44478B is a dual 1×4 RF multiplexer module that routes signals across eight independent switched channels in applications spanning DC to 1.3 GHz. Built around a tree relay structure, the module delivers bi-directional switching with 75 Ohm characteristic impedance, insertion loss below 1.9 dB at 1.3 GHz, and channel isolation exceeding 55 dB at 1 GHz. This configuration makes it well-suited for automated test systems, signal distribution networks, and complex RF measurement setups requiring high channel density with minimal signal degradation.
Technical Specifications
• Configuration: Dual 1×4 multiplexer (8 total switched channels, 4 per multiplexer)
• Frequency Range: DC to 1.3 GHz
• Characteristic Impedance: 75 Ohm
• Insertion Loss: 55 dB at 1 GHz
• Maximum Voltage: 42 V DC + AC peak per channel
• Maximum Current: 1 A DC or AC RMS per channel or common
• Maximum Power: 24 W, 24 VA, or 44 dBm per channel; 0.25 W or 0.25 VA per resistive termination
• Connectors: Female BNC for all signal connections; on-board male SMB for optional 50/75 Ohm terminations
– Key Features
• Low VSWR through tree relay architecture
• Bi-directional signal switching capability
• High channel isolation for measurement integrity
• Integrated termination points for off-channel loads
• Scalable channel count via dual independent multiplexers
– Typical Applications
• Automated RF and microwave test systems
• Multi-channel signal distribution and routing
• Antenna and component switching matrices
• Measurement systems requiring high isolation between channels
– Compatibility & Integration
Designed for integration into the Agilent/Keysight 3488A Switch/Control Unit mainframe and compatible modular instrument systems. Supplied with connection terminal and certificate of verification. Optional 75 Ohm SMB resistive termination kits available for channel termination.
