FT635 REL AC | Relay Control Unit for Radio Communication

The FT635 REL AC is a high-performance relay control unit designed for remote operation of radio transmitters and receivers. It enables relay switching, channel selection, and line monitoring over long distances using 2-wire or 4-wire communication. With a built-in pilot tone decoder and DC control capabilities, this unit is ideal for public safety, industrial communication, and dispatch centers.

Key Features:

• 2-Wire & 4-Wire Operation – Selectable via jumper for long-distance communication.
• Remote Relay Activation – Supports PTT activation via relay for remote transmitter control.
• Channel Switching via 5-Tone Signaling – Supports binary, decimal, and BCD formats for radio channel selection.
• Pilot Tone & DC Decoder – Ensures accurate signal transmission and relay activation.
• RS232 Serial Interface – Allows programming and configuration via PC.
• Galvanic Isolation – All audio inputs/outputs are transformer-isolated for noise-free communication.
• 8 Digital Inputs & 8 Digital Outputs – For additional control and monitoring functions.
• Line Monitoring Option (FT635 REL ACL) – Detects connection failures between two devices.
• LED Indicators – Displays relay status, pilot tone activation, and error signals.

Connection & Setup:

Remote Relay Control

The FT635 REL AC activates a relay when a pilot tone or DC signal is received, allowing remote radio transmission.

Channel Switching (5-Tone Signaling)

The unit supports remote channel selection using 5-tone sequences, with binary, decimal, and BCD output formats.

Line Monitoring (FT635 REL ACL)

The optional line monitoring function constantly checks the connection status between two devices, triggering an alarm if communication is lost.

RS232 Configuration

The FT635 REL AC features an RS232 serial interface for easy configuration via PC, supporting adjustable levels, pilot tone settings, and relay control.

Functions of LED Indicators:

• Green LED: Lit when the relay is active, the pilot tone is decoded, or DC has been applied.
• Yellow LED: Indicates pilot tone activation, DC presence, or AF connection.
• Blinking LED: Shows suppressed signal conditions.

Why Choose the FT635 REL AC?

• Reliable relay control for remote radio transmission.
• Supports channel switching, squelch detection, and PTT relay activation.
• Selectable 2-wire and 4-wire operation.
• Configurable via RS232 interface for full customization.
• Ideal for public safety, dispatch centers, and industrial radio communication.

Applications:

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