1. Introduction
The Radtel RT-850 is a versatile dual-band two-way radio designed for reliable communication across various frequency ranges. It supports 144-148MHz and 420-450MHz for transmit/receive operations, and offers a full band scanning receiver from 136-660MHz, including 68-108MHz (FM Rx) and 108-136MHz (Air Band Receiving at AM Mode).
Key features include a hidden LCD display, automatic frequency matching, USB Type-C charging, wireless frequency copying, and 128 memory channels. This manual provides essential information for setting up, operating, and maintaining your RT-850 radio.
2. Setup
2.1 Unboxing and Components
Before use, verify that all components are present in the package:
- 1x Radtel RT-850 Dual Band Radio
- 1x Lithium-Ion Battery Pack
- 1x Charging Cradle
- 1x Antenna
- 1x Belt Clip
- 1x User Manual (this document)
2.2 Battery Installation and Charging
The RT-850 uses a 7.4V 1100mAh Lithium-Ion battery. Ensure the battery is fully charged before initial 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 charge, place the radio with the installed battery into the charging cradle.
- Connect the USB Type-C cable to the charging cradle and then to a compatible power source.
- The charging indicator on the radio or cradle will show the charging status. A full charge typically takes several hours.
The Radtel RT-850 supports convenient USB Type-C charging. Place the radio in the provided charging cradle, and connect the Type-C cable to a power source. The display will indicate charging status.
2.3 Antenna Attachment
Screw the antenna clockwise onto the connector at the top of the radio until it is finger-tight. Do not overtighten.
3. Operating Instructions
3.1 Power On/Off and Volume
- To power on, rotate the power/volume knob clockwise until you hear a click.
- To power off, rotate the knob counter-clockwise until you hear a click.
- Adjust the volume by rotating the same knob.
3.2 Display and Navigation
The RT-850 features a 1.77-inch hidden LCD display. Use the keypad and menu button to navigate through functions and settings.
The RT-850 features a 1.77-inch hidden LCD display that integrates seamlessly into the radio's design. This display shows frequency, channel information, and various function menus such as VOX, FM, and CTCSS settings.
3.3 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.
3.4 Channel and Frequency Selection
The radio supports 128 memory channels. You can switch between channel mode and frequency mode (VFO) as needed. Refer to the radio's menu system for specific steps to enter frequencies directly or select stored channels.
3.5 Scanning Functions
The RT-850 includes various scanning capabilities:
- Full Band Scanning: Scans frequencies from 136-660MHz.
- Channel Scan: Scans through programmed memory channels.
- Priority Channel Scan: Monitors a designated priority channel while scanning other channels.
- FQSCAN: Detects frequency and CTCSS/DCS tones from other active radios.
3.6 Advanced Features
- VOX Function: Enables voice-activated transmission without pressing the PTT button.
- Emergency Alert/SOS: Activates an alarm signal for emergency situations.
- Wireless Copy Frequency: Allows cloning of frequency settings from another radio.
- PC Programming: Connect the radio to a computer for advanced programming of channels and settings using dedicated software.
- DTMF Encoding/Decoding: Supports Dual-Tone Multi-Frequency signaling.
- CTCSS/DCS: Continuous Tone-Coded Squelch System / Digital Coded Squelch for selective calling.
- Frequency Lock: Prevents accidental changes to the current frequency or channel.
- FM Standby Mode: Allows listening to FM radio broadcasts while monitoring for activity on the primary frequency.
- Busy Channel Lockout (BCLO): Prevents transmission on an occupied channel.
4. Maintenance
4.1 Battery Care
- Always use the original Radtel battery and charging cradle.
- Avoid overcharging or completely draining the battery to prolong its lifespan.
- Store the battery in a cool, dry place when not in use.
4.2 Cleaning
Wipe the radio's exterior with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners. Ensure the radio is dry before use.
4.3 Durability Features
The RT-850 is designed with durability in mind, featuring super waterproof and efficient dust control capabilities, along with anti-drop construction. While robust, avoid unnecessary exposure to extreme conditions.
The RT-850 is designed for durability, featuring super waterproof and efficient dust control capabilities, making it suitable for various environments. Its robust construction also provides anti-drop protection, and the audio output is engineered for clarity.
5. Troubleshooting
If you encounter issues with your Radtel RT-850, refer to the following common problems and solutions:
| Problem | Possible Cause / Solution |
|---|---|
| Radio does not power on | Battery is low or not installed correctly. Ensure battery is charged and properly seated. |
| Cannot transmit or receive | Incorrect frequency/channel selected. Antenna not properly attached. Battery low. Squelch level too high. Verify frequency settings, antenna connection, and battery charge. |
| Poor audio quality | Weak signal. Obstructions between radios. Volume too low/high. Check signal strength, move to an open area, adjust volume. |
| Programming issues via PC | Incorrect software or drivers. Communication cable not connected properly. Ensure the correct programming software and drivers are installed and the cable is securely connected. |
| Radio locks up or freezes | Try removing and reinserting the battery to perform a hard reset. |
6. Specifications
| Feature | Specification |
|---|---|
| Model Number | RT-850 |
| Brand | radtel |
| Manufacturer | Xiamen Radtel Electronics Co.,Ltd |
| TX/RX Frequency | 144-148MHz, 420-450MHz |
| Scanning Receiver Range | 136-660MHz (Full Band), 68-108MHz (FM Rx), 108-136MHz (Air Band AM Rx) |
| Channels | 128 Memory Channels |
| Display | 1.77-inch Hidden LCD Display |
| Battery | 1x 7.4V 1100mAh Lithium-Ion (included) |
| Charging | USB Type-C |
| Connectivity Technology | USB |
| Special Features | Air Band RX, Dual Band, Automatic Frequency Match, Wireless Copy Frequency, VOX, Emergency Alert, Scan, Battery Save, PC Programming, DTMF, SOS, Prior Channel Scanning, CTCSS/DCS, Frequency Lock, Wireless Cloning, FM Standby, TX Priority, TOT, Rogger, Busy Channel Lockout, SCR/Companding, FQSCAN |
| Product Dimensions | 4.13 x 1.97 x 4.13 inches (10.49 x 5.00 x 10.49 cm) |
| Item Weight | 15.5 ounces (439.42 grams) |
| Color | Black |
| Date First Available | May 13, 2023 |
This image illustrates the physical dimensions of the Radtel RT-850 radio, including its height with antenna (approximately 30 cm or 11.81 inches), width (5 cm or 1.97 inches), and depth (3.5 cm or 1.38 inches).
7. Warranty and Support
Warranty information for the Radtel RT-850 is typically provided with the product packaging or can be found on the official Radtel website. For technical support, service, or further inquiries, please contact Radtel customer service through their official channels.
