Introduction
This manual provides comprehensive instructions for the operation, maintenance, and troubleshooting of your Retevis RA685 (VHF/UHF Dual Band) or RA85 (GMRS) two-way radio. Please read this manual carefully before using the device to ensure safe and optimal performance.
Figure 1: Retevis RA685/RA85 Two-Way Radio Overview. Key features include dual-band operation (UHF/VHF or GMRS), Type-C charging, frequency measurement, and VFO mode.
Product Features
- Dual Band Operation: RA685 supports VHF (144-146MHz TX/RX) and UHF (430-440MHz TX/RX). RA85 supports GMRS.
- Channel Capacity: RA685 features 128 channels, RA85 features 60 channels.
- Adjustable TX Power: RA685 offers 5W/3W/1W adjustable power. RA85 offers 5W/0.5W.
- Type-C USB Charging: Convenient and efficient charging via USB Type-C port. Supports wall, car, power bank, and PC charging.
- 1.6 Inch Dot Matrix Display: Provides clear display of data and details.
- Frequency Measurement Function: Measures frequency and CTCSS/DCS, with copy function.
- Special Digital Mute Function: CTCSS/DCS/DTMF signaling code rejects unnecessary calls, ensuring secure communication and no eavesdropping.
- VOX Function: Allows hands-free operation without pressing the PTT button.
- Digital FM Radio: Built-in FM radio (65-108MHz).
- One-click Alarm Function: For emergency situations.
- NOAA Weather Channels: (GMRS version only) Keeps you informed with the latest weather forecasts.
- Compact and Portable: Lightweight design (223g including antenna and battery) with comfortable grip. Dimensions: 121*61*33mm.
- Long Range Communication: Compatible with repeaters to strengthen signal and communication range.
- Additional Functions: TOT (Time-out Timer), Monitor, Busy Channel Lockout, Squelch, Keyboard Lock, Power Save, Backlight, Flashlight, Dual Watch.
Package Contents
Please verify that all items listed below are included in your package:
Figure 2: Retevis RA685 Package Contents. Includes the radio unit, antenna, user manual, USB charger, and battery.
Figure 3: Retevis RA85 Package Contents. Includes the radio unit, antenna, user manual, USB charger, and battery.
- 1 x Two-Way Radio (RA685 or RA85 model)
- 1 x Antenna (Note: RA685 GMRS and RA685 EU antennas are not removable)
- 1 x User Manual
- 1 x USB Charger
- 1 x Battery (1800mAH Li-Ion)
Setup Instructions
1. Battery Installation and Charging
The radio comes with an 1800mAh Li-ion battery. Ensure the battery is fully charged before first use.
- To install the battery, align the battery pack with the grooves on the back of the radio and slide it upwards until it clicks into place.
- To remove, press the PUSH button above the battery and slide it downwards.
- Connect the USB Type-C charger to the charging port on the side of the radio.
- The radio supports multiple charging methods: Wall Charging, Car Charging, Power Bank, and PC Charging.
Video 1: Demonstrates battery installation, Type-C direct charging, and multiple charging methods for the Retevis RA685/RA85 radio. It also shows the detachable antenna and flashlight function.
Figure 4: Type-C USB Charging. The radio can be charged via various USB sources.
Figure 5: Charging options for the radio, including a charging base and direct USB-C connection.
Figure 6: Battery specifications, showing 1800mAh capacity, 14 hours working time, and 48 hours standby time at 5W.
2. Antenna Attachment
Screw the antenna clockwise into the antenna connector on top of the radio until it is firmly seated. Ensure a secure connection for optimal signal performance.
Figure 7: Detachable antenna connection point (SMA-F type for RA685).
Operating Instructions
1. Basic Controls and Display
Familiarize yourself with the radio's layout:
Figure 8: Radio Components and Controls.
- Power/Volume Switch (6): Rotate clockwise to turn on and increase volume, counter-clockwise to decrease volume and turn off.
- PTT (Push-to-Talk) Button (9): Press and hold to transmit, release to receive.
- Screen Display (7): 1.6 Inch Dot Matrix Display shows frequency, channel, battery status, and other operational information.
- Programmable Side Keys (10, 11): These buttons can be customized for various functions like Flashlight (PF1 short press), Emergency Alarm (PF1 long press), or FM Radio (PF2).
Figure 9: The 1.6-inch dot matrix display provides detailed information.
2. Channel and Frequency Selection
- Channel Mode: Use the up/down arrow keys to navigate through pre-programmed channels.
- VFO Mode (Frequency Mode): Allows manual input of frequencies. Press the V/M button to switch between Channel and VFO modes. Use the numeric keypad to enter desired frequencies.
Figure 10: Manually inputting frequencies in VFO mode.
3. Frequency Measurement and Copy
The radio can measure and copy frequencies and sub-audio tones (CTCSS/DCS) from other devices. For accurate measurement, ensure the distance between the transmitting and receiving radios is within 1 meter.
Figure 11: Frequency measurement and copy function. Maintain close proximity for best results.
4. Power Selection
Adjust the transmit power (5W/3W/1W for RA685, 5W/0.5W for RA85) based on your communication needs to optimize battery life and range.
Figure 12: Power selection options for RA685, balancing signal strength and power saving.
Figure 13: Power selection options for RA85, balancing signal strength and power saving.
5. Emergency Functions
- One-click Alarm: For emergency situations, activate the alarm function (often assigned to a programmable side key).
Figure 14: The one-click alarm function is designed for emergencies.
6. VOX Function
The Voice Operated Exchange (VOX) function allows you to transmit by speaking into the microphone without pressing the PTT button. This is useful for hands-free operation.
Figure 15: VOX function enables hands-free communication.
7. Digital FM Radio
The radio includes a digital FM radio function (65-108MHz). Refer to the user manual for specific instructions on tuning and saving FM stations.
Figure 16: The radio features a built-in FM radio.
8. NOAA Weather Channels (RA85 GMRS Version Only)
The RA85 GMRS version can receive 10 NOAA weather channels, providing real-time weather forecasts. This feature is crucial for outdoor activities and emergency preparedness.
Figure 17: NOAA Weather Channels (GMRS version only) for up-to-date weather information.
Maintenance
- Cleaning: Use a soft, damp cloth to clean the radio's surface. Do not use harsh chemicals or abrasive cleaners.
- 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 is not used for a long time, charge it once a month to maintain battery life.
- Storage: Store the radio in a dry, dust-free environment away from extreme temperatures.
- Antenna: Ensure the antenna is securely attached. Do not bend or force the antenna, as this can damage the radio.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Radio does not turn on. | Battery is low or not installed correctly. | Charge the battery or re-install it correctly. |
| Cannot transmit or receive. | Incorrect frequency/channel, antenna loose, or out of range. | Verify frequency/channel settings. Check antenna connection. Move closer to the other radio or use a repeater. |
| Poor audio quality. | Low battery, incorrect squelch level, or interference. | Charge battery. Adjust squelch level. Move away from sources of interference. |
| Battery life is short. | High transmit power, frequent use, or aging battery. | Reduce transmit power. Limit continuous transmission. Consider replacing the battery if it's old. |
Specifications
Figure 18: Detailed Technical Specifications.
| Category | Parameter | RA685 | RA85 |
|---|---|---|---|
| General | Frequency Range | 144-146MHz (RX/TX), 430-440MHz (RX/TX) | GMRS |
| Channel No. | 128CH | 60CH | |
| Channel Spacing | 25/12.5kHz | 12.5kHz | |
| Input Voltage | 7.4 VDC | ||
| Battery (standard configuration) | 1800mAH (Li-Ion) | ||
| Battery Life (5-5-90, High power transmission) | About 14 Hours | ||
| Operating Temperature | -20℃ to +60℃ | ||
| Walkie-talkie size (With battery, but without antenna) | 121×61×33mm | ||
| Transmitter | Transmit output power | 5W / 3W / 1W | 5W / 0.5W |
| Modulation | 16K0F3E@25KHz, 11K0F3E@12.5KHz | 16K0F3E@25KHz, 11K0F3E@12.5KHz | |
| Spurious emission | -36dBm < 1GHz, -30dBm > 1GHz | ||
| FM signal-to-noise ratio | 45dB@25KHz, 40dB @ 12.5KHz | ||
| Audio distortion | ≤5% | ||
| Receiver | Receiving sensitivity | 0.25μV (12dB SINAD) | |
| Adjacent channel selectivity | ≥60dB@25KHz, ≥55dB@12.5KHz | ||
| Intermodulation immunity | ≥60dB@25KHz, ≥55dB@12.5KHz | ||
| Conducted spurious emissions | ≤-57dB@25KHz, ≤-57dB @12.5KHz | ||
| Audio output power | 1W @16ohms | ||
Warranty and Support
RETEVIS provides comprehensive support for its products. For warranty information, technical assistance, or service, please refer to the following:
- Free Returns: Within 90 days of purchase.
- Fast Delivery Guarantee: Collect a $1.00 coupon for late delivery. Refunds if package lost or items damaged. Refund if no delivery in 60 days.
- Security & Privacy: Your personal details are protected and not shared with third parties without consent.
- Software & Support: Drivers and firmware updates may be available on the official RETEVIS website.
Figure 19: Software and Support options.
For further assistance, please contact RETEVIS customer service or visit their official website.
