1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the DykbRadio 80W Radio RF Power Amplifier Board. This board is designed to enhance the transmission power of 1-5W handheld radios, making them suitable for use with car platforms and improving communication clarity. It is compatible with MITSUBISHI RA or M series, and S series modules.
2. Technical Specifications
| Parameter | Value |
|---|---|
| Input Power | 1-5W |
| Output Power | 10-80W (depending on module) |
| Input Voltage | DC 10-13.8V |
| Operating Frequency | 130-170MHz, 400-470MHz (depending on module) |
| Insertion Loss | -1.5dB |
| VSWR (Bobbi) | Less than 1.5 |
| Appearance Size | 94 x 50 x 1.6mm |
| Type | UHF VHF RF Power Amplifier |
| DIY Supplies | Electrical |
Note: The color of the PCB board may vary. Please inquire before purchasing if this is a concern.
3. Installation and Commissioning
- Prepare Radiator: Before installation, prepare a radiator larger than the PCB board. The thickness of the radiator should be more than 25mm.
Figure 3.1: Power amplifier module fixed to a heatsink. Red marks indicate screw holes for the power amplifier module and PCB, which also serve as the negative pole of the module. Green marks indicate screw holes for fixing the PCB board, also serving as the GND of the PCB board. Proper fixing with screws is crucial to prevent self-excitation and ensure module functionality. Ensure sufficient distance between bottom element pins and the radiator to avoid short circuits. - Component Identification and Connection: Refer to the diagram below for identifying key components and connection points.
Figure 3.2: Labeled components on the amplifier board. 1: Electric indicator (green) and emission indicator light (red). 2: 1-5W power input (external stud hole SMA). 3: DC-12-13.8V power interface. 4: Module, second pin (VGG) voltage and power adjustment (clockwise increases voltage, counter-clockwise decreases). 5: Power output interface (upper, lower, right). - Power Output Feeder Welding: Weld the feeders at the power output interface. Feeders are supplied by the user.
Figure 3.3: Welding point for feeders at the power output interface. - Working Principle Diagram: Understand the basic connection and signal flow.
Figure 3.4: Working principle diagram showing the RF amplifier connected between a 1-5W radio and an antenna, with a DC 12V, 20A power supply and 50Ω feeders.
4. Operation
4.1 General Use
The amplifier board is designed to work with 1-5W handheld radios. Once properly installed and connected, it automatically converts between transceiver modes, boosting the transmission power.
4.2 Debugging and Voltage Adjustment
For RA series modules, debugging requires removing the module from the PCB board. All pins can be welded until the voltage is adjusted.
The VGG working voltage for RA modules (second pin from the left) is between 2.3-3.3V. A higher voltage typically results in higher output power. To debug:
- Connect a multimeter to measure DC voltage.
- Connect the red probe to the second pin (VGG) of the PCB board module.
- Connect the black probe to the anode.
- Press the launch button on the interphone.
- Adjust the blue potentiometer on the board: clockwise to increase voltage, counter-clockwise to decrease. The voltage value can be read from the multimeter.
For M or S series modules, the working voltage is 10-14V and can be directly mounted to the module PCB board, adjusted to 10-12V.
5. Maintenance
- Ensure proper heat dissipation by using a sufficiently sized heatsink (thickness > 25mm).
- Regularly check all connections for secure fit and absence of corrosion.
- Keep the board clean and free from dust and moisture.
- Avoid operating the amplifier outside its specified input voltage range (DC 10-13.8V).
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Module not working after installation | Improper fixing of the power amplifier module or PCB board. | Ensure the module and PCB are securely fixed with screws, especially at the negative pole and GND points, to prevent self-excitation. Refer to Figure 3.1. |
| Reduced output power or instability | Incorrect VGG voltage adjustment or insufficient heat dissipation. | Check and adjust the VGG voltage using the blue potentiometer (refer to Section 4.2). Verify the heatsink is adequately sized and properly installed. |
| No power indicator light | No input power or faulty connection. | Check the DC 10-13.8V power supply connection (interface 3 in Figure 3.2) and ensure it is providing power. |
| No emission indicator light | No input RF signal from the radio. | Ensure the 1-5W radio is connected correctly to the RF input (interface 2 in Figure 3.2) and is transmitting. |
7. User Tips
- Always ensure the power amplifier module and PCB board are securely fixed with screws to the heatsink. This is critical for preventing self-excitation and ensuring the module functions correctly.
- When adjusting the VGG voltage, use a multimeter for precise measurement. A higher VGG voltage generally leads to higher output power, but stay within the recommended range (2.3-3.3V for RA series, 10-14V for M/S series).
- Pay close attention to the distance between the bottom element pins and the radiator during installation to avoid accidental short circuits.
- Use 50Ω feeders for optimal performance and signal integrity.
8. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.
