1. Introduction
Thank you for choosing the Retevis RT668H/RT68H Two-Way Radio. This manual provides essential information for the safe and efficient operation of your device. These license-free walkie-talkies are designed for reliable long-range communication in various environments, featuring a hidden active view display, robust construction, and user-friendly functions like VOX hands-free and key lock.
2. Safety Information
- Do not operate the radio in explosive atmospheres (e.g., flammable gases, dust particles, metallic powders).
- Do not open the radio casing; repairs should only be performed by qualified personnel.
- Use only original or approved batteries and chargers to prevent damage and ensure safety.
- Keep the radio away from medical devices to avoid interference.
- Avoid prolonged exposure to direct sunlight or extreme temperatures.
- Do not immerse the radio in water, as it is not waterproof.
- Dispose of batteries and electronic components responsibly according to local regulations.
3. Package Contents
The standard package for the RT668H PMR version includes:
- 10 x RT668H Walkie Talkie units
- 10 x Belt clips
- 1 x 10-Way Charging base
- 10 x Hand straps
- 10 x User manuals
- Optional: 10 x Headphone (if purchased)
4. Product Overview
The Retevis RT668H/RT68H walkie-talkie is designed for ease of use and durability. Key features include:
- Active View Display: A hidden LED display that shows channel and battery information clearly.
- Robust Design: Constructed with ABS material, capable of withstanding drops from 1 meter.
- Long Range Communication: Provides reliable communication up to 4.7 km in optimal conditions.
- VOX Hands-free: Allows voice-activated transmission without pressing the PTT button.
- Key Lock: Prevents accidental channel changes or function activation.
- Clear Sound Quality: Equipped with a loud speaker and adjustable squelch function for clear audio in noisy environments.
5. Setup
5.1 Battery Installation
- Ensure the radio is powered off.
- Locate the battery cover on the back of the radio.
- Slide the battery cover latch to open the compartment.
- Insert the 1200mAh Li-ion battery, ensuring the contacts align correctly.
- Close the battery cover and secure the latch.
5.2 Charging the Battery
Your walkie-talkie can be charged using two methods:
- Using the Desktop Charging Base: Place the walkie-talkie into the 10-way charging base. Ensure the charging contacts on the radio align with those on the base. The indicator light on the base will show charging status.
- Direct Type-C Charging: Connect a Type-C USB cable to the charging port on the side of the radio. You can use a power bank, PC, or vehicle charger. The charging port supports reverse insertion for convenience.
6. Operating Instructions
6.1 Power On/Off
Rotate the power/volume knob clockwise to turn the radio on. Rotate counter-clockwise until a click is heard to turn it off.
6.2 Adjusting Volume
After powering on, continue rotating the power/volume knob to adjust the listening volume.
6.3 Channel Selection
Rotate the channel selector knob (typically the top-most knob) to choose one of the 16 available channels. The active view display will show the selected channel number.
6.4 Transmitting and Receiving
- To transmit, 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 receive.
6.5 VOX (Voice Operated Exchange) Function
The VOX function allows hands-free transmission. When activated, the radio will transmit automatically when it detects your voice. The VOX level can typically be adjusted from 1 to 9, with higher levels requiring louder voice input.
6.6 Key Lock Function
To prevent accidental operations, the radio features a key lock function. Refer to the specific button combination in your user manual for activation and deactivation. This locks the current channel for constant communication.
6.7 Squelch Function
The squelch function filters out weak signals and background noise. It can be adjusted from level 0 (no squelch) to 9 (maximum squelch). Adjusting the squelch level helps ensure clear communication, especially in noisy environments.
7. Maintenance
- Cleaning: Use a soft, damp cloth to clean the radio's surface. Do not use harsh chemicals or abrasive cleaners.
- Battery Care: To prolong battery life, avoid overcharging or completely discharging the battery. Store the radio and battery in a cool, dry place when not in use for extended periods.
- Storage: Keep the radio in a dry, dust-free environment. Remove the battery if storing for more than a month.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Radio does not power on | Battery is low or not installed correctly. | Charge the battery or re-install it properly. |
| No sound or weak sound | Volume is too low; squelch level is too high; radio is not on the correct channel. | Increase volume; lower squelch level; verify channel selection. |
| Short communication range | Obstacles (buildings, terrain); low battery; interference. | Move to an open area; charge battery; check for sources of interference. |
| Unable to charge | Charger or cable faulty; poor connection. | Check charger/cable; ensure secure connection to radio and power source. |
9. Specifications
| Feature | Specification |
|---|---|
| Model | RT68H / RT668H |
| Memory Channels | 16 |
| Battery Type | 1200mAh Li-ion battery |
| Standby Time | 30 hours |
| Work Time (RT68H) | 10 hours |
| Work Time (RT668H) | 15 hours |
| Dimensions (with antenna) | 165 x 55 x 33 mm (6.50 x 2.17 x 1.30 inches) |
| Weight | 161g / 0.35 lb |
| Audio Interface | K 2pin connector |
| Material | ABS |
| Frequency Range | 446MHz (PMR446) |
| Output Power | PMR ≤ 0.5W or FRS ≤ 2W (2W/0.5W) |
| Maximum Range | 3km-5km (up to 4.7km in optimal conditions) |
| CTCSS/DCS | 50 CTCSS + 210 DCS |
| VOX Level | 1-9 levels |
| Waterproof / Water-Resistant | No |
| Battery Included | Yes |
| Certification | CE, FCC |
10. User Tips
- Channel Compatibility: To communicate with other radios, ensure both devices are set to the same channel and use compatible CTCSS/DCS codes. If using a repeater, ensure your radio's settings match the repeater's frequency and tone settings.
- Range Optimization: For best range, operate in open areas with minimal obstructions. High ground can significantly improve signal reach.
- Battery Life: To maximize battery life, consider using the low power setting when long-range communication is not critical.
11. Warranty & Support
RETEVIS offers a lifetime warranty for this product. For any quality problems, a 7-day return policy is available. For technical support or inquiries, please refer to the contact information provided with your purchase or visit the official RETEVIS website.