JRC, CSC‑656 Relay Filter Board 9122-series Radar

The JRC CSC‑656 Relay Filter PCB (7PCRD1878) is a functional module used inside JRC 9122-series marine radar systems. Its primary function is to handle relay switching and signal filtering within the radar’s control circuitry.

Technical Specification

Main Functions of the CSC‑656 PCB:

1. Relay Switching

Contains electromechanical relays that switch various radar sub-circuits (power lines, signal paths).
Enables or disables components based on radar operational mode (e.g., standby, transmit).
Helps route control signals safely and efficiently within the radar.

2. Signal Filtering

Includes capacitors, resistors, and inductors that:
- Suppress electrical noise and interference.
- Protect sensitive radar components from voltage spikes or radio frequency noise.
Ensures clean, stable signals for processing and transmission.

3. Circuit Protection

May include diodes or fuses to protect other boards from overvoltage or relay back-EMF.
Acts as an intermediary safety layer between the power supply and radar control logic.

4. Isolation

Provides electrical isolation between high-power and low-power parts of the system.
Prevents cross-interference between circuits (especially important in high-frequency radar systems).