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$390.00Earn 390 points!
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The Transas Marine Low Frequency (LF) Box is a specialized interface module used in the Navi-Radar 4000 and Navi-Sailor 4000 (ECDIS/MFD) systems. It acts as an external connection hub for the Radar Integrator Board (RIB), which is the PCI card installed inside the main radar processor unit.
While high-frequency radar signals (video, trigger) are handled by a separate HF Box, the LF Box manages the critical “slow-speed” control and sensor data required for a stable radar picture.
| Parameter | Specification |
| Model Numbers | RIB-1590 / RIB-1838 |
| Interface to Processor | DB25 (25-pin D-Sub) Connector |
| Interface to Scanner | Screw Terminal Blocks (Inside the box) |
| Operating Voltage | $+12\text{V}$ DC (Supplied by Processor Card) |
| Signal Input Types | TTL, Open Collector, or RS-422 |
| Weight | $420\text{ g}$ ($0.92\text{ lbs}$) |
| Enclosure Rating | IP20 (Typically mounted inside a protected console) |
| Revision History | Rev 1.2 is the most common for legacy Navi-Radar 4000 units. |
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