Microchip / Datum 6504A IRIG-B RF Distribution Module

The Microchip/Datum 6504A is a ten-channel IRIG-B RF distribution amplifier in a 1U rack-mount chassis engineered to distribute IRIG-B time code signals with high precision across interconnected systems. The module accepts one IRIG-B input and provides ten buffered IRIG-B outputs, each operating at 1 kHz modulation frequency with a 3:1 modulation ratio. Output amplitude is specified at ≤3 V P-P, matching the input specification. Low phase noise RF amplifiers deliver channel isolation exceeding 100 dB, critical for maintaining signal integrity in time-synchronized applications. The modular architecture supports daisy-chaining up to ten units to achieve 100 total outputs, with each output capable of serving as a source for additional 6504 units, enabling near-infinite expansion with minimal signal degradation. Individual input and output alarms detect loss of time code or insufficient amplitude conditions. A summary alarm relay provides Form-C contact notification of any output failure or power loss. The chassis accepts 20 V to 75 V DC power and measures 1.75 inches high. An impedance switch selects 50 Ω operation when a single module is deployed. The 6504A includes an alarm override toggle switch for enable/disable control, with a green LED power indicator and dual D connectors for input plus twelve D connectors for individual output access.

– Technical Specifications

• Time Code Input: One (1) IRIG-B, 1 kHz modulation, 3:1 ratio, ≤3 V P-P
• Time Code Outputs: Ten (10) buffered IRIG-B, 1 kHz modulation, 3:1 ratio, ≤3 V P-P
• Channel Isolation: >100 dB
• Power Supply: 20 V to 75 V DC
• Physical: 1U rack-mount, 1.75 inches high

– Key Features

• Low phase noise RF amplifiers maintain exceptional channel isolation
• Dual input connectors and twelve output D connectors for flexible signal routing
• Input and output alarm indicators with summary Form-C relay for fault reporting
• Alarm override switch and green power indicator LED
• Impedance switch configurable for 50 Ω operation

– Typical Applications

• Critical infrastructure time synchronization networks
• Multi-system IRIG-B signal distribution requiring low jitter
• Facilities requiring redundant time code paths with expanded output capacity

– Compatibility & Integration

Up to ten 6504A units daisy-chain to provide up to 100 outputs. Each module output serves as input source for additional 6504 units, enabling scalable time code distribution architectures with negligible signal degradation.