Introduction
The HRD-104 Portable AM/FM Digital Radio is a compact and versatile device designed for convenient listening on the go. Featuring dual-band AM/FM reception, a clear 1.3-inch LCD display, and a user-friendly interface, this mini receiver allows you to enjoy news, music, and your favorite radio stations anywhere. Its small size, along with included accessories like a lanyard and headphones, makes it an ideal companion for daily use.
Figure 1: Front view of the HRD-104 Portable AM/FM Digital Radio, showcasing its compact design and digital display.
Setup
1. Battery Installation
The HRD-104 radio requires two (2) 1.5V AAA batteries (not included) for operation. Follow these steps to install them:
- Locate the battery compartment cover on the back of the radio.
- Slide the cover downwards to open the compartment.
- Insert two AAA batteries, ensuring the correct polarity (+ and -) as indicated inside the compartment.
- Close the battery compartment cover by sliding it upwards until it clicks into place.
Figure 2: Rear view of the HRD-104 radio with the battery compartment open, illustrating the correct insertion of AAA batteries. Note that batteries are not included.
2. Connecting Headphones
For private listening, connect the included 3.5mm headphones to the headphone jack located on the side of the radio. The radio is designed to provide stereo audio through the headphones. The included sponge earplugs can be used for added comfort and ear protection during prolonged use.
Figure 3: Side view of the HRD-104 radio, highlighting the headphone jack and micro USB charging port.
3. Charging (Optional)
While primarily battery-powered, the radio features a DC 5V micro USB port for external power supply. This port can be used to power the device directly from a compatible USB power source (e.g., a USB wall adapter or power bank) if desired, though it does not charge the AAA batteries.
Operating Instructions
1. Power On/Off
Press the POWER/SLEEP button (labeled 1 in Figure 7) to turn the radio on or off.
2. Band Selection and Tuning
The HRD-104 supports both AM and FM bands.
- Switching Bands: Press the AM/FM & SCAN button (labeled 11 in Figure 7) to switch between AM and FM modes.
- Automatic Scan: In either AM or FM mode, press and hold the AM/FM & SCAN button to automatically scan for available stations. The radio will stop at the next strong signal.
- Manual Tuning: Use the TUN+ (labeled 7 in Figure 7) and TUN- (labeled 8 in Figure 7) buttons to manually adjust the frequency in small increments.
- Preset Stations: The radio can store up to 58 preset stations (29 for each band).
- To save a station: Tune to the desired station, then press the MEMO/DEL button (labeled 12 in Figure 7). Use M+ (labeled 9) or M- (labeled 10) to select a preset number, then press MEMO/DEL again to confirm.
- To recall a station: Press M+ or M- to cycle through saved preset stations.
3. Volume Control
Adjust the volume using the Volume + (labeled 13 in Figure 7) and Volume - (labeled 14 in Figure 7) buttons located on the side of the radio.
Figure 4: Side view of the HRD-104 radio, indicating the location of the volume control buttons.
4. LCD Display
The 1.3-inch LCD display (labeled 6 in Figure 7) shows the current radio frequency, time, battery indicator, and other relevant information. For night use, the radio features an orange backlight. Press any button to activate the backlight for 5 seconds.
Figure 5: The HRD-104 radio with its orange backlight activated, improving visibility in low-light conditions.
5. Antenna Usage
For optimal FM reception, extend the external 4-section telescopic antenna (labeled 5 in Figure 7). If the signal is weak, try adjusting the antenna's position. If reception is disturbed by a very strong radio station, try shortening the antenna.
Figure 6: The HRD-104 radio with its telescopic antenna extended, demonstrating its use for enhanced FM reception.
6. Time and Alarm Setting
The radio includes a digital clock display and an alarm clock function. Refer to the detailed button function diagram (Figure 7) for specific controls related to time and alarm settings.
Figure 7: Detailed diagram illustrating the various buttons and their functions on the HRD-104 radio, including controls for time and alarm settings.
Key to Button Functions (Refer to Figure 7):
- Power/Sleep
- Lock
- DC 5V external power supply
- 3.5mm headphone socket
- Antenna
- LCD display
- TUN+
- TUN-
- M+
- M-
- AM/FM & SCAN
- MEMO/DEL
- Volume +
- Volume -
- Lanyard
- External loudspeaker
Maintenance
1. Battery Care
To prolong battery life and prevent potential damage from leakage, remove the AAA batteries from the compartment if the radio will not be used for an extended period. Replace batteries when the sound becomes smaller or beeping sounds appear, indicating low battery power.
2. Cleaning
Wipe the radio's exterior with a soft, dry cloth. Do not use abrasive cleaners, solvents, or strong chemicals, as these may damage the finish or internal components. Avoid exposing the radio to excessive moisture.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Radio does not turn on. | Batteries are dead or incorrectly installed. | Check battery polarity. Replace with fresh AAA batteries. |
| Poor reception / Static. | Weak signal; antenna not extended or positioned correctly. | Extend the telescopic antenna fully. Adjust antenna position. Try moving to a different location. |
| Low volume or distorted sound. | Low battery power; volume set too low. | Replace batteries. Increase volume using the volume buttons. |
| Cannot save or recall preset stations. | Incorrect button sequence. | Refer to the "Band Selection and Tuning" section for detailed instructions on saving and recalling presets. |
Specifications
| Model Number | HRD-104 |
| Material | ABS Plastic |
| Frequency Range | FM: 64-108MHz; AM: 520-1710 KHz (9K)/522-1710 KHz (10K) |
| Built-in Speaker | 40 mm, 8Ω, 0.5 W |
| Receiving Sensitivity | FM: 8 uV, AM: V/m |
| Stereo Separation | 32 dB |
| Distortion | ≤1% |
| Output Power | 200 mW |
| Headphone Port | 3.5 mm / 32Ω |
| Antenna | External, 4 sections |
| Power Supply | 2 x 1.5V AAA batteries (not included) |
| Charging Port | DC 5V, Micro USB |
| Lowest Operating Voltage | 2V |
| Dimensions (approx.) | 10.5 x 6 x 1.1 cm (4.13 x 2.36 x 0.43 inches) |
Warranty and Support
Warranty Information
Specific warranty details for this product may vary depending on your region and point of purchase. Please refer to the documentation provided at the time of purchase or contact your retailer for warranty terms and conditions.
Customer Support
For any questions, technical assistance, or issues not covered in this manual, please contact the seller or manufacturer directly. Provide your product model number (HRD-104) and a detailed description of the issue for faster service.
