FT634a Line Interface | Remote Radio Control & Channel Switching

The FT634a Line Interface is a versatile remote control unit designed to operate two-way radios over long distances using 2-wire or 4-wire connections. It supports channel switching, line monitoring, and advanced tone signaling, making it ideal for public safety, industrial communication, and control room applications. The FT634a is available in multiple versions to meet different operational requirements.

Key Features:

• 2-Wire & 4-Wire Connectivity – Allows flexible radio remote control over private or leased lines.
• Selectable Impedance – Supports 600 Ohm or Zr impedance (Zr for 2-wire connections only).
• Pilot Tone & DC Decoder – Ensures reliable signal transmission and activation.
• RS232 Serial Interface – Allows easy programming and configuration via software.
• Galvanic Isolation – All audio inputs/outputs are transformer-isolated to prevent interference.
• Channel Remote Switching (FT634aC & FT634aTRC) – Supports 5-tone signaling for radio channel control.
• Line Monitoring (FT634aCL) – Monitors 2-wire or 4-wire connections for signal integrity.
• TRC Encoding (FT634aTRC) – Uses TRC tones for repeater control and secure communication.

Available Versions & SKUs:

• FT634a – Standard line interface for remote radio control over 2-wire or 4-wire connections.
• FT634aC – Adds channel switching via 5-tone signaling.
• FT634aCL – Includes line monitoring to detect connection issues.
• FT634aTRC – Uses TRC encoding for repeater control and advanced signaling.

Connection & Setup:

2-Wire & 4-Wire Configuration

The FT634a supports both 2-wire and 4-wire connections, which can be selected using an internal jumper.

Channel Switching (FT634aC & FT634aTRC)

Channels can be remotely switched using 5-tone signaling, with support for binary, decimal, and BCD formats.

Line Monitoring (FT634aCL)

When using the FT634aCL version, line monitoring continuously checks the integrity of the communication link.

TRC Encoding (FT634aTRC)

The FT634aTRC replaces the pilot tone encoder with TRC encoding, supporting Guard Tones (2100 Hz, 2175 Hz, 2325 Hz) and Function Tones (650 Hz - 2050 Hz) for channel switching and repeater control.

Functions of LED Indicators:

• Green LED: Indicates successful tone decoding (pilot tone, DC, or AF signal).
• Yellow LED: Indicates when a pilot tone, DC, or AF signal is applied to the line.

Why Choose the FT634a Line Interface?

• Flexible 2-wire and 4-wire operation for remote radio control.
• Supports channel switching, line monitoring, and TRC encoding.
• Ideal for dispatch centers, control rooms, and emergency communication.
• Configurable via RS232 for full customization.

Applications:

• 🔹 Public Safety & Emergency Response – Remote radio control for police, fire, and ambulance services.
• 🔹 Industrial & Utility Operations – Secure communication for power plants and large facilities.
• 🔹 Transportation & Logistics – Railway, aviation, and maritime communication systems.