HP / Agilent 11694A Matching Transformer, 3 to 500 MHz, 75 Ohms

The HP/Agilent 11694A is a precision matching transformer that converts impedance between 75-ohm and 50-ohm RF systems. It enables accurate measurements in 75-ohm environments while maintaining amplitude calibration with 50-ohm spectrum analyzer inputs, making it essential for RF and microwave test setups where impedance mismatch would otherwise degrade signal integrity.

– Technical Specifications

• Frequency Range: 3 MHz to 500 MHz
• Impedance Transformation: 75 Ohms ↔ 50 Ohms (bidirectional)
• Maximum CW Power Rating: 0.5 W
• Maximum Insertion Loss: 0.6 dB
• VSWR:
– 1.3 (3 MHz to 10 MHz)
– 1.2 (10 MHz to 500 MHz)
• 50 Ohm Connector: BNC male
• 75 Ohm Connector: BNC female

– Key Features

• Low insertion loss (≤0.6 dB) preserves signal amplitude across the operating band
• Excellent return loss performance with VSWR ≤1.3 across full frequency range
• Standard BNC connectors for direct integration into existing test systems
• Compact design suitable for laboratory and field test environments
• Bi-directional impedance conversion accommodates flexible system configurations

– Typical Applications

• Cable and antenna measurements on 75-ohm networks connected to 50-ohm analyzers
• Video and broadcast RF signal characterization
• Impedance matching in communication system test benches
• Signal integrity verification in mixed-impedance test chains

– Compatibility & Integration

The 11694A integrates directly into RF measurement systems via standard BNC connectors. Its low VSWR and minimal insertion loss ensure reliable operation with spectrum analyzers, network analyzers, and signal sources across the 3 MHz to 500 MHz band. Suitable for use alongside RF directional bridges, power dividers, and other passive test accessories.