JRC JAPAN NFC-802 MF/HF ANTENNA TUNER COUPLER P/N CBA-801 6PCKD00725A

Model: NFC-802
Part Number: CBA-801
Assembly/Serial Identifier: 6PCKD00725A
Manufacturer: JRC (Japan Radio Co., Ltd.)

The JRC NFC-802 is a robust, fully automatic antenna tuner (coupler) designed for marine and demanding fixed-station applications. Its primary function is to efficiently match the impedance between a shipboard or base-station MF/HF transmitter (or transceiver) and a long-wire or whip antenna over a broad frequency spectrum. This ensures maximum power transfer and optimal communication performance while protecting the transmitter from harmful reflected power.

• Frequency Range: Covers the entire MF and HF bands. Typical range is from approximately 1.6 MHz to 30 MHz, ensuring compatibility with all maritime communication channels (e.g., 2-4 MHz maritime mobile band, 4-27.5 MHz HF bands), including DSC, SSB, and Telex.

• Power Rating: Designed for high-power marine transmitters, typically handling 1.5 kW PEP/SSB and 1 kW continuous power output.

• Antenna Compatibility: Specifically engineered for use with insulated long-wire antennas or shipboard whip antennas. It is designed to match a wide range of antenna impedances, compensating for the variable characteristics of such antennas across different frequencies.

• Tuning System: Fully Automatic. Upon a transmit command from the connected radio, the unit rapidly samples the antenna impedance and adjusts its internal matching network using a motorized variable inductor and capacitor banks to find the optimal match. This occurs in a fraction of a second.

• Control Interface: Operates via a multi-wire remote control cable connected to a compatible JRC transceiver (e.g., JRC JSS-710/720, JRC-1150/1250 series) or a separate control unit. This cable carries DC power, control signals (PTT, tuning start), and status feedback.

• Construction:

  • Robust & Seafaring: Built to withstand harsh maritime environments. The unit features a heavy-duty, water-resistant and corrosion-resistant metal enclosure.

  • Internal Components: Utilizes a high-voltage vacuum variable capacitor (for efficient high-power handling and durability), a motor-driven roller inductor, and a robust matching transformer/network.

  • Cooling: Equipped with an internal fan for forced-air cooling during high-power, extended transmissions.

• Safety Features: Includes interlocks, over-current protection, and a high-voltage discharge circuit for operator safety.

• Primary: Maritime Shipboard Communications. Installed on commercial vessels, naval ships, and fishing boats as part of a GMDSS-compliant or general communication station.

• Secondary: Land-Based Fixed Stations. Used in coastal radio stations, research facilities, or any remote installation requiring reliable long-range HF communication with non-resonant antennas.