The Agilent/Keysight 44472A is a dual 1×4 VHF multiplexer module that routes analog and pulse signals across two independent groups of four channels up to 300 MHz. Each 1×4 configuration provides isolated signal switching with 50 Ω characteristic impedance and BNC connectors for straightforward integration into test systems. The module delivers insertion loss below 0.5 dB at 30 MHz, scaling to 1.25 dB at 300 MHz, while maintaining exceptionally low crosstalk within each group (better than −100 dB at 30 MHz) and between groups (better than −85 dB at 30 MHz). Channel-to-channel matching keeps signal delay variation below 90 psec, and rise time under 0.7 nsec ensures fidelity for high-frequency measurements. VSWR remains well-controlled across the operating band, ranging from 1.06 at 30 MHz to 1.43 at 300 MHz. The closed-channel resistance is negligible at under 1 Ω, and DC isolation exceeds 10⁷ Ω.
Technical Specifications
• Frequency range: DC to 300 MHz
• Configuration: Dual 1×4 coaxial switches
• Characteristic impedance: 50 Ω
• Insertion loss: <0.5 dB @ 30 MHz, <0.75 dB @ 100 MHz, <1.25 dB @ 300 MHz
• Isolation (within group): <−100 dB @ 30 MHz, <−85 dB @ 100 MHz, <−85 dB @ 300 MHz
• Isolation (group-to-group): <−85 dB @ 30 MHz, <−65 dB @ 100 MHz, <−50 dB @ 300 MHz
• VSWR: <1.06 @ 30 MHz, <1.12 @ 100 MHz, <1.43 @ 300 MHz
• Closed-channel resistance: 10⁷ Ω at <40°C, 95% RH
• Rise time: <0.7 nsec
• Signal delay: <2.5 nsec (channel match <90 psec)
• Thermal offset: <15 µV
– Key Features
• Maximum voltage: 250 V DC or 30 V AC RMS (center-center, center-low); 42 V DC (low-chassis/low-low)
• Maximum current: 30 mA DC or 300 mA AC RMS per channel
• Physical dimensions: Approximately 8 × 6 × 4 inches; 5 lbs
• Connectors: BNC
– Typical Applications
• Spectrum analyzer signal routing
• Network analyzer multiplexing
• Distortion analyzer inputs
• Multi-channel oscilloscope and waveform analyzer switching
• Pulse signal measurement and selection
– Compatibility & Integration
Designed for use with HP/Agilent 3488A and 3499A/B/C mainframes. The module is now obsolete per Keysight.
