Hiroyasu HW-UV938 Multi-band Walkie Talkie User Manual

1. Introduction

The Hiroyasu HW-UV938 is a versatile multi-band walkie talkie designed for a wide range of communication needs. It features extensive frequency coverage, high output power, and advanced functionalities such as cross-band repeating, scrambling, and various reception modes including AM, FM, SSB, CB, HF, SW, MW, LW, and NOAA weather alerts. This manual provides essential information for setting up, operating, and maintaining your device.

2. Package Contents

Ensure all items are present in your package:

• 1 × HIROYASU HW-UV938 Radio Body
• 1 × 7.4V 2400mAh Li-ion Battery Pack
• 1 × SMA-Female FM/136-174/400-520MHz High Gain Antenna
• 1 × Desktop Charger
• 1 × Type-C Charging Cable
• 1 × AC Adapter
• 1 × Belt Clip
• 1 × Hand Strap
• 1 × English User Manual
• 1 × Type-C Programming Cable (Optional)
• 1 × Shortwave Donut Antenna (Optional)

3. Product Overview

Familiarize yourself with the components of your HW-UV938 walkie talkie:

1. Antenna
2. PTT (Push-To-Talk) Button
3. Side-key 1
4. Side-key 2
5. Battery
6. SW/MW/W FM antenna (Channel knob)
7. ON/OFF volume
8. Indicator Light
9. Alarm Button
10. Display screen
11. Keypad
12. MIC (Microphone)
13. Speaker
14. Ear/Mic jack
15. Type C charging port/programmable jack

4. Initial Setup

4.1. Unboxing and Assembly

Upon receiving your HW-UV938, carefully unbox all components. The following video demonstrates the unboxing and initial assembly steps:

4.2. Attaching the Antenna

Carefully screw the provided SMA-Female antenna onto the antenna connector at the top of the radio until it is finger-tight. Do not overtighten.

4.3. Installing the Battery

Align the 7.4V 2400mAh Li-ion battery pack with the battery compartment on the back of the radio. Slide it into place until it clicks securely. To remove, press the release latch and slide the battery out.

4.4. Charging the Battery

The HW-UV938 can be charged using the included desktop charger or directly via the Type-C port. Connect the AC adapter to the desktop charger, then place the radio in the charging cradle. Alternatively, plug the Type-C charging cable directly into the radio's Type-C port. The charging indicator light will show the charging status.

4.5. Powering On/Off

Rotate the ON/OFF volume knob (7 in Figure 3.1) clockwise to power on the radio. Rotate it counter-clockwise until it clicks to power off.

5. Operating Instructions

The HW-UV938 features a 2.4-inch TFT color LCD for easy navigation and display of information.

5.1. Frequency Range Selection

The radio supports a broad range of frequencies for both transmission (Tx) and reception (Rx):

• FM: 64-108MHz (RX)
• SW (Shortwave): 2.3-30MHz (RX AM)
• MW (Medium Wave): 520-1710KHz (RX AM)
• LW (Long Wave): 153-279KHz (RX AM)
• Rx: 18-620MHz, 840-1000MHz
• Tx: 18-32MHz, 136-174MHz, 400-520MHz

You can select the desired work range through the menu. Navigate to 'Basic Settings' and then 'Work Range' to choose between 64-620MHz, 18-64MHz, or 840-1000MHz. The radio will restart after changing the work range.

5.2. Frequency Step Adjustment

The radio offers various frequency step options for precise tuning:

• 0.25K, 1.25K, 2.5K, 5K, 6.25K
• 10K, 12.5K, 20K, 25K, 50K, 100K, 500K
• 1M, 5M

Access this setting via the 'Basic Settings' menu under 'Freq Step'.

5.3. AM/FM Reception

The HW-UV938 supports both AM and FM reception modes. To switch between them for receiving, navigate through the menu options. For SW/MW/LW/FM receiving, enter the FM Radio Menu and long press the '# v/m' key.

5.4. Scrambler Function

The radio includes 8 groups of scramblers for enhanced privacy. This feature can be enabled or disabled via the 'Channel Set' menu under 'Scrambler'.

5.5. Cross-Band Repeater

The cross-band repeater function allows the radio to relay signals between different frequency bands (U trans U, U trans V). This extends communication range and flexibility. Activate this feature through the 'Basic Settings' menu under 'UV Repeater'.

5.6. Programmable Side Keys ('Key Define')

The HW-UV938 features programmable side keys (Side-key 1, Side-key 2) and a Multi PTT function, allowing you to assign frequently used features for quick access. Customize these settings in the 'Key Define' menu.

5.7. DTMF Functionality

The radio supports DTMF (Dual-Tone Multi-Frequency) for various signaling purposes. Settings for DTMF mode, TX start/end, and other parameters can be found in the 'Analog Settings' menu.

5.8. 1750 Tone and Audio Gain

The 1750 Tone is available for repeater access. You can also adjust the MIC Gain and Speaker (SPK) Gain to optimize audio quality. These settings are typically found within the 'Analog Settings' menu.

5.9. FM Radio

Enjoy FM radio broadcasts within the 64-108MHz range. Access the FM radio function through the main menu.

5.10. NOAA Weather Forecast

Stay informed with NOAA weather forecasts. This feature allows you to receive weather alerts and information. Access this function through the radio's menu.

5.11. Spectrum Analyzer

The HW-UV938 includes a spectrum analyzer display, which can be useful for visualizing signal activity across frequencies.

6. User Tips

• SSB on 27MHz CB: The HW-UV938 supports CB/SSB/HF reception and transmission in the 18-32MHz range, which includes the 27MHz CB band. This implies SSB operation is possible within this range.
• Enabling SW/LW Range: To enable Shortwave (SW) and Longwave (LW) reception, navigate to the FM Radio Menu and then long press the '# v/m' key to select the desired band.
• GPS/APRS Functionality: The radio has optional GPS and APRS features. These can be found and configured under the 'Extend (Optional)' menu in the device settings.
• Pre-configured Frequencies: While the radio offers extensive frequency capabilities, it is recommended to verify and configure specific frequencies or channels as per your local regulations and operational needs.

7. Maintenance

• Cleaning: Use a soft, damp cloth to clean the radio's exterior. Do not use harsh chemicals or solvents.
• Battery Care: To prolong battery life, avoid overcharging or completely draining the battery. Store the battery in a cool, dry place when not in use.
• Antenna: Ensure the antenna is securely attached. Avoid bending or stressing the antenna, as this can damage the connector or affect performance.
• Storage: When storing the radio for extended periods, remove the battery and store it separately.

8. Troubleshooting

• No Power: Check if the battery is properly installed and charged. Ensure the ON/OFF volume knob is turned on.
• No Reception/Transmission: Verify the antenna is correctly attached. Check the selected frequency and mode. Ensure the battery has sufficient charge.
• Poor Audio Quality: Adjust the MIC Gain and SPK Gain settings in the 'Analog Settings' menu. Check for any obstructions to the microphone or speaker.
• Menu Navigation Issues: If the menu seems unresponsive, try restarting the radio.
• Frequency Range Not Changing: After selecting a new work range, the radio will restart. Ensure you allow it to complete the restart process.

9. Specifications

10. Warranty and Support

For warranty information and technical support, please refer to the documentation provided with your purchase or contact the seller directly. Keep your proof of purchase for any warranty claims.