Retevis RT98 Mobile Transceiver User Manual

1. Introduction

This manual provides detailed instructions for the proper operation and maintenance of your Retevis RT98 Mobile Transceiver. Please read this manual thoroughly before using the device to ensure safe and efficient communication. The RT98 is a compact 2-meter band mobile radio designed for vehicle use, offering 199 programmable channels and various advanced features.

Retevis RT98 Mobile Transceiver with Handheld Microphone

Figure 1: Retevis RT98 Mobile Transceiver with attached handheld microphone.

2. Key Features

2-meter band mobile transceiver with handheld microphone and LCD display.
199 programmable channels with frequency setting name options.
51 CTCSS and 1024 DCS tones for enhanced communication privacy.
Compact and lightweight design (100x106x24mm, 434g) for easy installation in vehicles.
Adjustable microphone gain (1-16 levels) and squelch function for clear audio.
Supports CHIRP and keypad programming.
Additional functions: reverse frequency, talk around, offset direction setup, time out timer, multiple scan methods, scan dwell time setup.

3. Package Contents

Verify that all items are present upon unpacking:

Retevis RT98 Mobile Transceiver Unit
Handheld Microphone (attached)
Mounting Bracket
Power Cable with Fuse
Mounting Screws and Washers
User Manual (this document)

Contents of the Retevis RT98 package including radio, microphone, mounting bracket, and power cable.

Figure 2: Included components in the Retevis RT98 package.

4. Product Overview

4.1. Front Panel and Controls

Front panel of Retevis RT98 showing LCD, Function, V/M, SCA, SQL buttons, and Power/Volume knob.

Figure 3: Front panel controls and indicators.

LCD Display: Shows frequency, channel number, and other operational information.
RX/TX Indicators: LEDs indicating receive (RX) or transmit (TX) status.
FUN (Function) Key: Accesses the function menu for advanced settings.
V/M (VFO/Memory) Key: Switches between Frequency (VFO) mode and Channel (Memory) mode.
SCA (Scan) Key: Initiates or stops scanning.
SQL (Squelch) Key: Adjusts the squelch level.
Power On/Off & Volume Key: Turns the radio on/off and adjusts audio volume.

4.2. Rear Panel and Connections

Antenna Jack: Connects to your external antenna.
External Speaker Jack: For connecting an optional external speaker.
Power Input: Connects to the 13.8V DC power source.

4.3. Handheld Microphone

Detailed view of the Retevis RT98 handheld microphone showing PTT, MIC, and Up/Down keys.

Figure 4: Handheld microphone features.

PTT (Push-To-Talk) Button: Press to transmit, release to receive.
MIC: Integrated microphone.
Up/Down Keys: Used for frequency or channel selection.

5. Setup

5.1. Mounting the Transceiver

The compact size of the RT98 allows for flexible installation in various vehicles. Use the provided mounting bracket and screws to secure the radio in a convenient location, ensuring proper ventilation.

Dimensions of the Retevis RT98 radio: 102mm width, 109.6mm depth, 25mm height.

Figure 5: Retevis RT98 dimensions for mounting.

5.2. Power Connection

Connect the red wire of the power cable to the positive terminal of your 13.8V DC power source and the black wire to the negative terminal. Ensure the fuse is correctly installed in the power cable for protection.

5.3. Antenna Connection

Connect a suitable 2-meter band antenna to the antenna jack on the rear of the transceiver. A properly tuned antenna is crucial for optimal performance and to prevent damage to the radio.

Retevis RT98 radio connected to an external antenna for vehicle use.

Figure 6: RT98 connected to an external antenna.

6. Operating Instructions

6.1. Power On/Off and Volume Adjustment

To power on, press and hold the Power/Volume knob until the display lights up.
To power off, press and hold the Power/Volume knob again.
Rotate the Power/Volume knob to adjust the audio level.

6.2. Channel/Frequency Selection

VFO Mode (Frequency Mode): Press the V/M key to enter VFO mode. Rotate the Power/Volume knob or use the Up/Down keys on the microphone to change the frequency.
Memory Mode (Channel Mode): Press the V/M key to enter Memory mode. Rotate the Power/Volume knob or use the Up/Down keys on the microphone to select a stored channel.

6.3. Transmitting and Receiving

To transmit, press and hold the PTT button on the handheld microphone. Speak clearly into the microphone. Release the PTT button to return to receive mode.

6.4. Squelch Adjustment

The squelch function reduces background noise. Press the SQL key and rotate the Power/Volume knob to adjust the squelch level (typically 1-9 levels). A higher level requires a stronger signal to open the squelch.

6.5. Scanning

Press the SCA key to start scanning through active channels or frequencies. Press SCA again to stop scanning.

6.6. Function Operation Overview

Video 1: This video provides a visual guide to the basic function operations of the Retevis RT98 mini mobile radio, including power on, frequency adjustment, and menu navigation.

7. Advanced Operation and Programming

7.1. Menu Navigation

Press and hold the FUN key to enter the main menu. Use the Up/Down keys on the microphone or rotate the Power/Volume knob to navigate through menu options. Press FUN again to confirm a selection or exit the menu.

7.2. CTCSS/DCS Tones

To set CTCSS (Continuous Tone-Coded Squelch System) or DCS (Digital Coded Squelch) tones:

Enter the function menu (press and hold FUN).
Navigate to the CTCSS/DCS setting (e.g., T-CDC or R-CDC).
Select the desired tone from the available options (51 CTCSS, 1024 DCS).
Confirm and exit the menu.

7.3. Offset Direction Setup

For repeater operation, an offset frequency is required:

Enter the function menu.
Navigate to the Offset setting.
Set the offset frequency and direction (positive or negative).
Confirm and exit.

7.4. CHIRP Programming

The Retevis RT98 supports CHIRP programming software, compatible with Windows XP/7/8/10/11 systems. This allows for convenient programming of channels and settings via a computer. A programming cable (sold separately) is required.

8. Maintenance

Keep the radio clean using a soft, dry cloth. Avoid harsh chemicals.
Ensure all connections (power, antenna, microphone) are secure.
Protect the radio from extreme temperatures, direct sunlight, and moisture.
Regularly check the power cable and fuse for any signs of damage.

Image showing heat dissipation fins on the top of the Retevis RT98 radio, with arrows indicating airflow.

Figure 7: The RT98 features a heat sink design for efficient heat dissipation, crucial for prolonged operation.

9. Troubleshooting

Problem	Possible Cause	Solution
No power	Loose power connection, blown fuse, power supply issue.	Check power cable, replace fuse, verify power source.
Cannot transmit	PTT not pressed, incorrect frequency/channel, antenna issue.	Ensure PTT is pressed, verify frequency/channel, check antenna connection.
Cannot receive	Squelch too high, incorrect frequency/channel, CTCSS/DCS mismatch.	Lower squelch, verify frequency/channel, check CTCSS/DCS settings.
Poor audio quality	Low microphone gain, high squelch, interference.	Adjust microphone gain, lower squelch, check for interference sources.

10. Specifications

Feature	Specification
Brand	Retevis
Model Number	RT98
Frequency Range	144-148 MHz (VHF)
Number of Channels	199
CTCSS/DCS Tones	51 CTCSS, 1024 DCS
Voltage	13.8 Volts (DC)
Item Weight	434 Grams (approx. 15.3 ounces)
Product Dimensions	3.94 x 4.17 x 0.94 inches (100 x 106 x 24 mm)
Talking Range Maximum	3 Kilometers (dependent on terrain and conditions)
Water Resistance Level	Not Water Resistant
Compatible Devices	Two-way radios or walkie talkies operating on the same frequency

11. Warranty and Support

For warranty information and technical support, please refer to the official Retevis website or contact your local dealer. Keep your purchase receipt as proof of purchase.

Retevis RT98