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The JRC OMC FCX68 (6AJRD1) is a high-power microwave circulator designed for X-band marine radar systems, specifically for 25kW transceivers like the JMA-9122 and JMA-5300MK2.
In a radar scanner, the circulator acts as a “traffic cop” for microwave energy. It allows the high-power pulse from the magnetron to travel to the antenna while preventing that same energy from flowing directly into the sensitive receiver.
| Specification | Details |
| Manufacturer | Manufactured by Toshiba/TDK for JRC (Japan Radio Co.) |
| Part Number | FCX68 (JRC Code: 6AJRD1 / 5AJIX00027) |
| Frequency Range | 9.30 GHz to 9.50 GHz (X-Band) |
| Power Rating | Optimized for 25kW peak power systems |
| Insertion Loss | $< 0.4 \text{ dB}$ (Typical) |
| Isolation | $> 20 \text{ dB}$ (Typically 23-25 dB) |
| Interface | WR-90 Waveguide Flange |
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