Retevis RT668H Professional Two-Way Radio User Manual

1. Introduction

This manual provides detailed instructions for the safe and efficient operation of your Retevis RT668H Professional Two-Way Radio. Please read this manual thoroughly before using the device to ensure proper functionality and to prevent damage.

2. Safety Information

Observe the following safety precautions to reduce the risk of fire, electric shock, or personal injury:

• Do not operate the radio in explosive atmospheres (e.g., flammable gases, dust particles, metallic powders).
• Do not replace or charge batteries in potentially explosive environments.
• Use only Retevis-approved batteries and chargers.
• Do not disassemble or modify the radio. Repairs should only be performed by qualified technicians.
• Avoid exposing the radio to direct sunlight for extended periods or to extreme temperatures.
• Keep the radio away from water and moisture. The device is water-repellent, but not fully waterproof.
• Maintain a safe distance from medical devices such as pacemakers.

3. Package Contents

Upon unpacking, please verify that all items listed below are present and in good condition:

• Retevis RT668H Two-Way Radio
• Hand Strap
• Belt Clip
• USB Charging Base
• User Manual
• 1200mAh Lithium-ion Battery (pre-installed or separate)

4. Product Overview

The Retevis RT668H is a professional two-way radio designed for reliable communication. It features a robust ABS casing for durability and a hidden LED display for essential information.

4.1 Key Features

• Hidden LED Display: Provides clear visibility of channel and battery status.
• Durable Construction: Robust ABS material designed to withstand drops from 1 meter.
• Key Lock Function: Prevents accidental operation.
• Clear Audio: Equipped with a speaker and adjustable squelch (0-9 levels) for clear communication in noisy environments.
• Long Battery Life: 1200mAh Lithium-ion battery offers 10-15 hours of operation and Type-C charging.
• VOX Hands-free: Voice-activated transmission for convenient use.
• License-Free Operation: Compatible with PMR446 standards.

5. Setup

5.1 Charging the Battery

Before initial use, fully charge the radio's battery. The RT668H uses a 1200mAh Lithium-ion battery and supports Type-C charging.

1. Insert the radio into the USB charging base.
2. Connect the USB charging base to a compatible power source using a Type-C cable.
3. The charging indicator light on the base will show the charging status. Refer to the radio's hidden LED display for battery level.

5.2 Attaching Accessories

Attach the hand strap and belt clip as needed for convenient carrying.

• Hand Strap: Thread the hand strap through the designated loop on the radio.
• Belt Clip: Align the belt clip with the screw holes on the back of the radio and secure it with the provided screws.

6. Operating Instructions

6.1 Power On/Off and Volume Adjustment

1. Power On: Rotate the Power/Volume knob clockwise until you hear a click. The radio will power on.
2. Volume Adjustment: Continue rotating the Power/Volume knob to adjust the listening volume.
3. Power Off: Rotate the Power/Volume knob counter-clockwise until you hear a click. The radio will power off.

6.2 Channel Selection

The RT668H supports 16 channels. To select a channel:

1. Rotate the Channel Selector knob to choose the desired channel (1-16).
2. The hidden LED display will show the selected channel number.

6.3 Transmitting and Receiving

1. Receiving: When the radio is on and on an active channel, it will automatically receive incoming transmissions.
2. Transmitting: Press and hold the Push-To-Talk (PTT) button on the side of the radio. Speak clearly into the microphone. Release the PTT button to stop transmitting and return to receive mode.

6.4 VOX Function (Hands-free)

The VOX (Voice Operated Exchange) function allows you to transmit without pressing the PTT button. This is useful for hands-free operation.

To activate or adjust VOX, refer to the detailed programming instructions or consult the full user manual if available. The radio supports various VOX sensitivity levels.

6.5 Key Lock Function

The key lock feature prevents accidental button presses, ensuring uninterrupted communication.

To activate or deactivate the key lock, typically press and hold a designated button (often the 'Menu' or a programmable side button) for a few seconds. Consult the full user manual for specific button assignments.

6.6 Squelch Function

Squelch filters out weak signals and background noise, providing clearer audio. The RT668H features 0-9 squelch levels.

• Level 0: Minimum squelch, allows all signals, including noise.
• Level 9: Maximum squelch, only strong signals are received.

Adjust the squelch level to balance between receiving weak signals and minimizing background noise. This setting is usually programmable via software or a combination of button presses.

7. Maintenance

7.1 Cleaning

• Clean the radio's surface with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners.
• Ensure the charging contacts are clean and free of debris.

7.2 Battery Care

• Avoid overcharging or completely discharging the battery.
• Store the battery in a cool, dry place when not in use for extended periods.
• If the battery shows signs of damage or leakage, discontinue use immediately and dispose of it properly.

7.3 Storage

• Store the radio in a dry, dust-free environment.
• Remove the battery if storing the radio for more than a month.

8. Troubleshooting

9. Specifications

10. Warranty and Support

Retevis provides the following warranty for the RT668H two-way radio:

• Radio Body: 2-year warranty from the date of purchase.
• Accessories: 1-year warranty from the date of purchase.
• Returns: 30-day no-reason return policy.

Beyond the warranty period, maintenance services are available. Buyers are responsible for any associated costs.

For any inquiries, technical support, or warranty claims, please contact Retevis customer service via Amazon. We aim to respond within 12 hours.