1. Introduction
This manual provides detailed instructions for the safe and efficient operation of your Diyeeni HRD-737 Wide Frequency Receiver. Please read this manual thoroughly before using the device and retain it for future reference. The HRD-737 is a portable digital radio receiver designed to cover multiple frequency bands, including AIR, FM, AM, CB, SW, and VHF, offering a versatile listening experience.
Image 1.1: Diyeeni HRD-737 Wide Frequency Receiver (Black and Gold models shown).
2. Product Overview
2.1 Key Features
- Wide Frequency Coverage: Supports AIR (118-138MHz), FM (87.5-108MHz), AM (520-1720KHz), SW (2-30MHz), VHF (30-223MHz), and CB (25-28MHz) bands.
- Digital Display: 1-inch LCD screen with backlight for clear frequency, battery, and sensitivity indication.
- Memory Function: Integrated chip with powerful memory, capable of storing up to 50 radio stations per band.
- Multiple Search Modes: Manual, automatic, fully automatic, and storage radio search options.
- Portable Design: Compact and lightweight with a built-in 700mAh 3.7V lithium battery for on-the-go use.
- Extended Antenna: Includes an external steel rod antenna to enhance reception sensitivity, especially for shortwave bands.
- Timer Functions: Adjustable auto-off timer (90-10 minutes) and alarm tone/automatic radio power-on.
- Audio Output: Built-in 40mm, 8Ω, 1W speaker and 3.5mm audio jack for headphones.
2.2 Components and Controls
Familiarize yourself with the various parts and controls of your HRD-737 receiver.
Image 2.1: Front view of the HRD-737 receiver.
- LCD Display: Shows frequency, battery status, and signal strength.
Image 2.2: 1-inch LCD display with backlight.
- Control Buttons: BAND, SET, MODE, MEMO, Up/Down arrows for tuning and navigation.
- Volume Knob (VOL): Adjusts audio output level.
- Speaker: Integrated 40mm speaker for audio playback.
- Antenna: Retractable steel rod antenna. An extended antenna is also provided for improved reception.
Image 2.3: Steel rod antenna for enhanced sensitivity.
- Top Panel Ports: Power/Sleep button, Lock switch, DC5V charging port (Micro USB), 3.5mm headphone jack, and external antenna port.
Image 2.4: Top panel connections.
- Battery: Built-in 700mAh 3.7V lithium battery.
Image 2.5: Built-in 700mAh lithium battery.
- Included Accessories: Headphones, user manual, extended antenna.
Image 2.6: Included accessories.
3. Setup
3.1 Initial Charging
Before first use, fully charge the internal lithium battery. Connect the receiver to a DC5V power source using a Micro USB cable (not explicitly listed as included, but implied by port). The battery indicator on the LCD will show charging status.
3.2 Antenna Connection
For optimal reception, especially for shortwave (SW) and aircraft (AIR) bands, extend the built-in telescopic antenna. For even better shortwave reception, connect the provided extended antenna to the external antenna port on the top of the device.
3.3 Headphone Connection
To listen privately, plug your headphones into the 3.5mm headphone jack located on the top panel.
4. Operating Instructions
4.1 Power On/Off
Press and hold the POWER/SLEEP button on the top panel to turn the receiver on or off.
Image 4.1: Power/Sleep button.
4.2 Band Selection
Press the BAND button repeatedly to cycle through the available frequency bands: AIR, FM, AM, CB, SW, VHF.
4.3 Tuning and Frequency Adjustment
- Manual Tuning: Use the Up (▲) and Down (▼) arrow buttons to manually adjust the frequency in small increments.
- Automatic Search: Press and hold the Up (▲) or Down (▼) arrow buttons to automatically scan for the next available station.
4.4 Station Search Modes
The receiver offers four search modes:
- Manual Search: As described above, use arrow buttons.
- Automatic Radio Search: Initiates a scan and stops at each detected station.
- Fully Automatic Search and Storage: Scans the entire band and automatically saves all found stations to memory.
- Memory Recall: Use the MEMO button to access stored stations.
Refer to the on-screen prompts or specific button combinations (e.g., pressing MODE or SET in conjunction with search buttons) for detailed instructions on activating each search mode.
4.5 Setting Auto-Off Timer
The auto-off timer can be set to automatically power off the radio after a specified duration. Available settings are 90, 80, 70, 60, 50, 40, 30, 20, and 10 minutes. Consult the manual's specific section on timer settings, usually accessed via the SET or MODE button.
4.6 Alarm Function
The receiver includes an alarm function that can trigger an alarm tone or automatically turn on the radio. Instructions for setting the alarm are typically found by pressing the SET button and navigating through the menu options.
4.7 Lock Function
Slide the LOCK switch on the top panel to prevent accidental button presses and changes to settings during transport or use.
5. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the receiver. Do not use liquid cleaners or solvents.
- Battery Care: To prolong battery life, avoid fully discharging the battery frequently. Recharge the battery when the low battery indicator appears. If storing the device for an extended period, charge it to approximately 50% and recharge every few months.
- Storage: Store the receiver in a cool, dry place away from direct sunlight and extreme temperatures.
- Antenna: Retract the telescopic antenna when not in use to prevent damage.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Battery is discharged. | Charge the receiver using a DC5V power source. |
| Poor reception / Static | Weak signal, antenna not extended, or interference. | Extend the telescopic antenna fully. Connect the extended antenna for better reception. Move to an open area away from electronic devices that may cause interference. |
| No sound | Volume too low, headphones connected, or speaker issue. | Increase the volume using the VOL knob. If headphones are connected, audio will output through them. Disconnect headphones if you wish to use the speaker. |
| Buttons unresponsive | Lock function is active. | Slide the LOCK switch to the unlocked position. |
7. Specifications
Image 7.1: Back panel with frequency specifications.
| Feature | Detail |
|---|---|
| Brand | Diyeeni |
| Model Number | HRD-737 (Diyeeni5xzd8kcfew-01) |
| Color | Black |
| Material | Plastic |
| Special Features | Portable |
| Connectivity Technology | Auxiliary (3.5mm audio) |
| Product Dimensions (L x H) | 10.3 cm x 1.5 cm (Approx. 4.1 x 0.6 inches) Image 7.2: Product dimensions. |
| Tuning Technology | VHF |
| Power Source | Battery Powered (Built-in 700mAh 3.7V Lithium Battery) |
| Supported Radio Bands & Frequencies |
|
| Compatible Devices | Headphones |
| Max Speaker Output Power | 1 Watt (40mm, 8Ω) |
| Screen Type | LCD (1-inch with backlight) |
| Hardware Interface | 3.5 mm Audio, Micro USB (DC5V) |
| Water Resistance Level | Water Resistant |
| Included Components | Headphones, User Manual, Extended Antenna |
| UPC / GTIN | 765192490397, 765192437248 |
8. Warranty and Support
For warranty information and customer support, please refer to the documentation provided with your purchase or contact the retailer. Specific warranty terms may vary by region and seller.