RETEVIS RT668D/RT68D DMR Digital Two-Way Radio User Manual

1. Introduction

The Retevis RT668D/RT68D DMR Digital Two-Way Radio is a versatile communication device designed for various professional environments such as schools, warehouses, hotels, and retail stores. It combines digital clarity with analog compatibility, offering extended battery life, enhanced security features, and a durable build. This manual provides essential information for the safe and effective use of your radio.

Key Features:

• DMR Digital/Analog Dual Mode
• Power-Saving Mode/Low Battery Alert
• Lone Worker Mode
• Programmable Side Keys
• Emergency Alarm
• 16 Zones, 16 Channels per Zone, Selectable Zones
• High/Low Power Switch
• ARC4/AES128/AES256 Encryption
• Private/Group/All Call
• IP54 Protection Rating
• Compatible with Motorola DMR Communications
• Dual-Slot Direct Mode
• Squelch
• Customizable via Client Software
• VOX
• Scan
• Monitor
• Repeater/Talkaround

2. Unboxing and Initial Inspection

Before using your new Retevis RT668D/RT68D radio, carefully open the packaging box and inspect the host unit and all included accessories. Ensure all items are present and undamaged. If any items are missing or appear damaged during transportation, please contact your delivery personnel or distributor immediately.

Package Contents (Example for UHF Version with Cable Adapt):

The specific contents may vary based on the package option (e.g., PMR with Cable, UHF with Cable Adapt). Please refer to your specific product packaging for an exact list.

3. Setup and Assembly

3.1. Charging the Battery

New or long-unused rechargeable batteries must be charged before initial use. When the battery level is low, recharge or replace the battery.

Charging Procedure:

1. Insert the adapter (standard output: 5V DC, 1A) into a power outlet.
2. Place the battery or radio with the battery installed onto the charging dock.
3. Ensure the battery makes proper contact with the charging terminals. The charger indicator will turn red, indicating charging has started. For Type-C charging, insert the Type-C plug into the Type-C charging port on the right side of the device. A green icon will indicate full charge.
4. Charging takes approximately 4-5 hours. When the charger indicator turns green, charging is complete. The battery or radio can now be removed for use.

Charging Precautions:

• Do not short-circuit battery terminals or discard batteries in fire. Do not disassemble the battery casing.
• The ambient temperature during charging should be between 0°C and 40°C. Charging outside this range may affect proper battery charging.
• Turn off the radio power during charging. Using the radio while charging may interfere with proper charging.
• Avoid unplugging the power source or battery during charging to avoid disrupting the charging process.
• If usage time is significantly reduced even after a full charge, the battery has reached the end of its life and should be replaced.
• Do not unplug and reconnect a fully charged battery for recharging, as this may shorten battery life or cause damage.
• Do not charge wet batteries or radios. Dry them with a cloth before charging to avoid hazards.
• Warning: All batteries may cause damage or personal injury if conductive metals such as jewelry, keys, or chains come into contact with the electrodes. Handle all batteries with care.
• Warning: Keep new or old used batteries out of reach of children.
• Warning: The plug of the adapter is considered a disconnect device. The socket-outlet shall be installed near the equipment and shall be easily accessible.

3.2. Installing/Removing the Battery

Align the battery's bottom positioning posts with the battery slot on the rear casing. Press gently on the top of the battery to lock it into place. To remove the battery, push the lock upward and pull the battery out.

3.3. Installing/Removing the Belt Clip

If necessary, attach the included belt clip to the screw holes on the back of the battery pack for easy carrying. To remove the belt clip, unscrew the two screws.

3.4. Attaching the Radio Strap

Thread the radio strap through the loop on the middle of the radio.

3.5. Connecting an Optional Speaker/Microphone Headset

Lift the headset cover and insert the speaker/microphone headset directly into the corresponding jack.

4. Operation

4.1. Getting to Know Your Device - Key Functions

4.2. Indicator Light Status

4.3. Basic Operations

4.3.1. Power On/Off

To power on, rotate the 【Power/Volume】 knob clockwise until a "click" is heard. The current channel number will be announced. To power off, rotate the knob counterclockwise until a "click" is heard.

4.3.2. Adjusting Volume

After powering on, rotate the volume knob clockwise to increase volume and counterclockwise to decrease volume.

4.3.3. Selecting a Zone

A zone is a group of channels. This device supports up to 16 zones, each containing up to 16 channels. Use the side key preset as 【Zone Switch】 to select a zone. If voice prompts are enabled, the device will announce the zone number after switching.

4.3.4. Selecting a Channel

Rotate the 【Channel Knob】 to select a channel. If voice prompts are enabled, the device will announce the channel number upon power-on or when switching 【Channel Knob】.

4.3.5. Digital Calls

You can initiate private, group, or all calls to preset contacts on the current digital channel.

• Private Call: One-to-one communication.
• Group Call: One-to-many communication.
• All Call: A call to all contacts on the current digital channel.

Initiating a Call:

In standby mode, press and hold the 【PTT】 key to initiate a private, group, or all call to the preset contact(s) on the current digital channel. During communication, hold the radio vertically 2.5-5 cm from your mouth. The red LED will light up. Release the 【PTT】 key to receive responses.

Receiving/Responding to a Call:

No action is required to receive a call. During a private or group call, press and hold the 【PTT】 key within the preset time to respond.

Ending a Call:

• Private/Group Call: The call will end if no one presses the 【PTT】 key within the call hold time.
• All Call: The call ends when the caller releases the 【PTT】 key.

4.3.6. Analog Calls

Analog calls are initiated on analog channels. To transmit, press and hold the 【PTT】 key and speak into the microphone. To receive, release the 【PTT】 key.

4.4. Functional Operations (Configurable via CPS Software)

Many advanced features and settings of the RT668D/RT68D radio are configurable using the CPS (Customer Programming Software). Ensure the radio is connected to a computer via a data cable, run the CPS, and confirm the current communication port settings before making changes.

4.4.1. CPS Channel Settings

The CPS allows detailed configuration of each channel, including frequency, aliases, color codes, and more. The device supports 16 digital and 16 analog channels.

• Frequency Band: Display the operational frequency range. The device must operate within this range.
• CH Alias: Assign an alias (0-16 characters) to the current channel.
• Color Code: Identify a system. Users communicating must set the same color code.
• Talkaround: Allows direct radio-to-radio communication when a repeater is unavailable.
• RRX Only: Enable receive-only mode for the channel.
• Auto Start Scan: Automatically starts scanning when switching to this channel.
• Scan: Select a scan list for the current channel.
• Offset: Set the offset between transmit and receive frequencies (MHz).
• Power Level: Select transmit power: High/Low. Can also be switched via a programmable key.
• Emergency System: Associate a predefined digital alarm system with the channel.
• TOT (Time-Out Timer): Sets the maximum call transmission duration (15-495s).
• TOT Pre-Alert Time: Alerts user about impending transmission interruption (0-10s).
• TOT Re-Key Time: Waiting time before retransmitting after TOT activation (0-60s).
• Private Call Confirmed: Option to send a confirmed private call request.

4.4.2. Programmable Side Keys (SK1)

The side keys can be programmed for various functions, including Zone Selection, Scan On/Off, Power Adjust, Monitor, Battery Indicator, SQL Level, VOX On/Off, Encrypt On/Off, Nuisance Delete, Repeater/Talkaround, Work Alone On/Off, Alert Tones On/Off, Emergency On/Off, and One Call functions.

4.4.3. Voice Announcement

Voice announcements for channel and battery status can be enabled or disabled, and set to English or Chinese via the CPS software.

4.4.4. Tones (Alert Tones)

Various alert tones can be configured in the CPS, such as Talk Permit Tone, Radio Kill, Radio Active, Warning, Channel Busy Lock, TOT, Private Call, Group Call, All Call, Battery Low, Empty Channel, Empty Contacts, Power On, Call Alert, and Failed To Transmit.

4.4.5. VOX Function

VOX allows hands-free transmission, initiating and stopping transmission automatically based on voice detection. This feature is configurable via CPS.

4.4.6. Battery Save Function

The radio can be configured to run minimal programs to reduce power consumption and extend battery life. This mode can be enabled/disabled in CPS.

4.4.7. Scan Function

The scan function allows monitoring communication activities on channels. At least one scan list must be retained. Scan lists and auto-start scan can be configured in CPS.

4.4.8. Monitor Function

A listening mode used to receive weak signals by decoding signals on a specific channel and outputting sound through the speaker. This can be assigned to a programmable key.

4.4.9. Lone Worker Mode

If the radio is not operated within a preset time, it will automatically alert other users or a control center for assistance. This feature is configurable in CPS.

4.4.10. Squelch

Squelch filters out excessive background noise and suppresses it when no signal is received, keeping the speaker silent. The squelch level can be adjusted in CPS.

4.4.11. DTMF Signaling

Dual Tone Multi-Frequency (DTMF) signaling enables calling another radio using specific tone combinations.

4.4.12. MIC Gain

Adjusts the audio level to increase the microphone's sound, affecting amplitude and output sound level. Configurable for both built-in and external microphones.

4.4.13. DMR Digital Functions

• Private Call: Single call from one user to another.
• Group Call: Single call from one user to a group of users.
• All Call: Single call from one user to all other users. This is receive-only and has a higher priority.
• Encryption: Uses keys to encrypt voice or data, allowing decryption only by receivers with matching keys, preventing eavesdropping. Supports ARC4, AES128, AES256.
• Emergency Alarm System: Associate a channel with a predefined digital alarm system.
• Emergency Alert Confirmation: Set whether to provide an audible or visual alert when an alarm code is received.
• Allow Interrupt: Allows a terminal to transmit a priority interrupt command.
• Dual Slot Switch: Enable or disable dual slots for multiple communication sessions on the same frequency channel using time slots.
• Repeater Slot: Allows multiple sessions on the same channel by dividing it into time slots.
• Contacts: Set contacts for the channel, including aliases, IDs, and call types.
• Group Call List: Provide a list of all group call contacts or shortcut key lists, allowing a digital channel to receive multiple group calls.
• Remote Stun: Remotely disable a radio's transmit function, making it receive-only.
• Remote Kill: Remotely disable a lost or unauthorized radio, preventing both transmit and receive.
• Activate: An authorized radio can remotely restore a stunned or killed radio.

5. Maintenance and Cleaning

• Do not hold the radio by the antenna or external microphone.
• Use a lint-free cloth to wipe dust and stains off the radio to prevent poor contact.
• Cover the earphone jack when not in use.
• After prolonged use, buttons, control knobs, and the casing may become dirty. Clean them with a mild detergent (avoid strong corrosive chemicals) and a damp cloth.

6. Troubleshooting

If you encounter issues with your Retevis RT668D/RT68D radio, please refer to the following common troubleshooting steps:

• No Power: Ensure the battery is properly installed and charged. Check if the power knob is turned on.
• Cannot Transmit or Receive: Verify that you are on the correct channel and zone. Check the volume level. Ensure the antenna is securely attached. If using digital mode, confirm that the color code matches other radios in your group.
• Poor Audio Quality: Adjust the volume. Check for obstructions around the microphone and speaker. Ensure the radio is held 2.5-5 cm from your mouth during transmission.
• Short Battery Life: Ensure the battery is fully charged. Consider enabling power-saving mode in the CPS. The battery may need replacement if its capacity has significantly degraded.
• Interference/Noise: Check for nearby electronic devices that might cause interference. Adjust the squelch level in CPS.
• Radio Not Responding to CPS: Ensure the data cable is securely connected and the correct communication port is selected in the CPS software.

For persistent issues, consult the "Warranty and Support" section for contact information.

7. Specifications

*Frequency range may vary according to device type and local regulations. For business use, ensure compliance with local rules. Your dealer or system administrator may set the operating frequency, and you may not be able to change it. Check with your dealer for more information.

CTCSS/DCS Lists:

The radio supports various CTCSS (Continuous Tone-Coded Squelch System) and DCS (Digitally Coded Squelch) codes for filtering unwanted communications. These lists are extensive and can be found in the full PDF manual or configured via CPS. Examples include:

• CTCSS Frequencies (Hz): 67.0, 69.3, 71.9, ..., 254.1
• DCS Codes (DCS-N): D023N, D025N, D026N, ..., D754N
• DCS Codes (DCS-I): D023I, D025I, D026I, ..., D325I

For a complete list of CTCSS/DCS codes, please refer to the detailed tables in the official user manual PDF.

8. Safety Information and Warnings

8.1. General Safety Precautions

• CAUTION: User instructions should accompany the device when transferred to other users.
• Unauthorized Modification and Adjustment: Do not make changes or modifications not expressly approved by the party responsible for compliance, as this may void your authority to operate the radio. Transmitter adjustments should only be made by certified personnel.
• Radio License: Two-way radios operate on authorized frequencies regulated by local radio management departments. Ensure you have a valid radio license if required in your region. Operating without a license or on unauthorized frequencies may be prohibited.
• FCC Requirements: This device complies with part 15 of the FCC Rules. Operation is subject to not causing harmful interference and accepting any interference received.

8.2. RF Safety and Exposure

This two-way radio uses electromagnetic energy in the radio frequency (RF) spectrum. Improper use can cause biological damage. To control your exposure and ensure compliance with established RF exposure limits, always adhere to the following procedures:

• Transmit no more than the rated duty factor 50% of the time.
• Reduce the amount of time spent using your wireless device.
• Use a speakerphone, earpiece, headset, or other hands-free accessory to reduce proximity to the head.
• Increase the distance between wireless devices and your body.
• Hold the radio in a vertical position with the microphone (and other parts of the radio including the antenna) at least one inch (2.5 centimeters) away from the nose or lips.

8.3. Electromagnetic Interference/Compatibility

Your radio generates RF energy that can cause interference with other devices or systems. To avoid interference:

• Turn off the radio in areas where signs are posted to do so (e.g., hospitals, healthcare facilities).
• Persons with pacemakers or other active implantable medical devices: Consult your physician regarding potential risks. Turn off the radio immediately if interference is suspected. Do not carry the radio in a chest pocket or near the implantation site.
• Hearing Aids: Some digital wireless radios may interfere with hearing aids. Consult your hearing aid manufacturer.
• Other Medical Devices: Consult the manufacturer of your device to determine if it is adequately shielded from RF energy.
• Potentially Hazardous or Explosive Atmospheres: Turn off your radio prior to entering such areas (e.g., blasting caps, flammable gas, dust particles, fueling areas). Only use intrinsically safe radios in these environments.
• Do not use any radio that has a damaged antenna.
• Turn off your radio when on board an aircraft.

8.4. Protect Your Hearing

• Use the lowest volume necessary.
• Turn up the volume only if in noisy surroundings.
• Turn down the volume before adding a headset or earpiece.
• Limit the amount of time using headsets or earpieces at high volume.
• Do not place the radio's speaker directly against your ear.
• Excessive sound pressure from earphones and headphones can cause hearing loss.

8.5. Choking Hazard Warning

WARNING: CHOKING HAZARD - Small Parts. Not suitable for children under 3 years old. KEEP NEW OR OLD USED BATTERIES OUT OF REACH OF CHILDREN.

9. User Tips

• For optimal performance, ensure your radio's firmware is up to date. Check the Retevis website for the latest software and firmware updates.
• When programming channels via CPS, double-check frequency settings and CTCSS/DCS codes to ensure compatibility with other radios in your network.
• Utilize the programmable side keys for frequently used functions like Zone Switch or Power Level adjustment for quick access.
• If experiencing short range, ensure you are using the correct antenna and consider switching to high power mode if permitted by regulations.
• Always carry a spare charged battery for extended use, especially in critical applications.

10. Frequently Asked Questions (FAQ)

Q: Can I use extra ear pieces with this radio?

A: Yes, the radio features a headphone jack (Key Function No. 8) for connecting optional speaker/microphone headsets or ear pieces. Ensure compatibility with the radio's jack type.

Q: How do I know if the radio is charging?

A: When charging, the indicator light (Key Function No. 2) will show solid red. It will turn solid green once charging is complete.

Q: Is this radio license-free?

A: The European (EU) version of this radio is designed for PMR446 license-free communications. However, frequency regulations vary by country. Always verify local regulations and licensing requirements for your specific region and radio version.

11. Warranty and Support

11.1. Guarantee

Most new products carry a two-year manufacturer's warranty from the date of purchase. This guarantee card should be kept by the user; no replacement if lost.

To obtain warranty and after-sales service:

• Contact the seller where you purchased the product.
• Products may be repaired by a local repair center.

For warranty service, you will need to provide a receipt or proof of purchase from the actual seller for verification.

Exclusions from Warranty Coverage:

• Any product damaged by accident.
• Damage due to misuse or abuse of the product or as a result of unauthorized alterations or repairs.
• If the serial number has been altered, defaced, or removed.

11.2. Authorized Accessory List

For a list of Retevis-approved accessories for your radio model, visit the website: http://www.retevis.com. You can also contact Retevis for assistance regarding repairs and service.

11.3. Contact Information

12. Product Disposal

The crossed-out wheeled-bin symbol on your product, literature, or packaging reminds you that all electrical and electronic products, batteries, or accumulators must be taken to designated collection locations at the end of their working life. Do not dispose of these products as unsorted municipal waste. Dispose of them according to the laws and rules in your area.