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The Transas High Frequency (HF) Box (RIB-1838 V.2.0) is a critical interface module used in Wärtsilä/Transas Navi-Radar 4000 and Navi-Sailor 4000 systems. It serves as the high-speed bridge between the Radar Processor and the Transceiver (Scanner).
While the Low Frequency (LF) Box handles slow-speed data like bearing and heading, the HF Box is dedicated to the high-bandwidth analog signals required to generate the actual radar image on the screen.
| Parameter | Specification |
| Model | RIB-1838 |
| Version | 2.0 (High Frequency Variant) |
| Signal Inputs | Radar Video, Trigger (Sync), Feedback |
| Interface | BNC Connectors (Analog) and Terminal Blocks |
| Impedance | $50\text{ }\Omega$ or $75\text{ }\Omega$ (Configurable) |
| Compatibility | Transas RIB-6 and RIB-PC Radar Processor Cards |
| Mounting | Typically DIN-Rail or internal cabinet bulkhead |
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