1. Introduction
The Mcbazel Surecom SW-33 Plus is a compact, handheld digital SWR and power meter designed for VHF and UHF two-way radio systems. It provides direct digital readouts of Forward Power (FW), Reflected Power (RW), and Standing Wave Ratio (VSWR) without requiring calibration. This device is suitable for measuring power output up to 100W across a frequency range of 125-525 MHz, making it an essential tool for radio enthusiasts and professionals to ensure optimal antenna performance and radio health.
2. Important Safety Information
- DMR Digital Radios: This device is NOT compatible with DMR digital radios. Attempting to use it with DMR radios may result in inaccurate readings or damage to the equipment.
- Dummy Load: Always use a dummy load with an appropriate power rating. Using a dummy load with insufficient power handling capability can cause damage to the dummy load and potentially the meter or radio. The included dummy load is rated for 5-20W.
- Power Limits: Do not exceed the maximum measurable power range of 100W.
- Connections: Ensure all connections are secure and correct before transmitting. Loose connections can lead to inaccurate readings or equipment damage.
- Environmental Conditions: Avoid exposing the device to extreme temperatures, moisture, or direct sunlight. This device is not water resistant.
- Ground Plane: For accurate SWR measurements, it is crucial to hold the metal case of the SWR meter to ensure a proper ground plane, especially when testing handheld radios.
3. Package Contents
Please verify that all items listed below are included in your package:
- 1x SW-33 Plus Power & SWR Meter
- 1x SMA male to SMA male Adaptor
- 1x SMA male to SMA female Adaptor
- 1x SMA female to BNC female Adaptor
- 1x SMA male to BNC male Adaptor
- 1x 5-20W DUMMY LOAD for testing
- 1x Micro USB Charging Cable
- 1x User Manual
4. Product Overview
The SW-33 Plus meter features a clear LCD display and intuitive controls for easy operation. Below is a diagram illustrating the main components and their functions.
- LCD Display: Shows VSWR, Forward Power (FW W), and Reflected Power (RW W) readings.
- Power On/Off/LCD Mode Button: Used to power the device on/off and cycle through different display modes.
- TX Indicator: Illuminates when transmitting.
- ANT./50Ω Load Port: Connects to your antenna or a 50Ω dummy load.
- To Radio Port: Connects to your two-way radio.
- 5V Micro USB Power In: For charging the internal battery.
- Charge LED: Indicates charging status.
5. Setup
5.1 Charging the Device
Before initial use, fully charge the SW-33 Plus meter. Connect the provided Micro USB charging cable to the 5V Micro USB Power In port on the side of the device and plug the other end into a standard USB power source (e.g., computer USB port, USB wall adapter). The Charge LED will indicate the charging status.
5.2 Connecting to Radio and Antenna/Dummy Load
The SW-33 Plus comes with various adapters to facilitate connection to different radio and antenna types. Ensure you use the correct adapters for a secure connection.
- Connect your two-way radio to the bottom port labeled 'To Radio' on the SW-33 Plus meter. Use an appropriate adapter if necessary.
- Connect your antenna or a 50Ω dummy load to the top port labeled 'ANT./50Ω Load'. Use an appropriate adapter if necessary.
- Ensure all connections are finger-tight to prevent signal loss and ensure accurate readings.
6. Operation
6.1 Powering On and Off
- Power On: Press and hold the red 'on/off' button for approximately 2 seconds until the display illuminates. The device will typically start in 'ALL Mode', showing VSWR, FW, and RW simultaneously.
- Power Off: Press and hold the red 'on/off' button for approximately 2 seconds until the display turns off.
6.2 Display Modes
Briefly press the red 'on/off' button to cycle through the available display modes:
- ALL Mode: Displays VSWR, Forward Power (FW W), and Reflected Power (RW W) simultaneously.
- 90° Mode: Rotates the display by 90 degrees, showing VSWR, FW, and RW.
- 180° Mode: Rotates the display by 180 degrees, showing VSWR, FW, and RW.
- VSWR Mode: Displays only the VSWR value.
- FW Power Mode: Displays only the Forward Power (FW W) value.
6.3 Measuring SWR and Power
Follow these steps to accurately measure the SWR and power output of your radio and antenna system:
- Select SWR Mode: Power on the device and cycle through the display modes until you reach the desired SWR display (e.g., ALL Mode or VSWR Mode).
- Position Antenna: Place the antenna vertically and ensure there are no significant obstacles or metal objects nearby that could interfere with the measurement.
- Ensure Ground Plane: For handheld radios, it is critical to touch the metal box of the SWR meter with your hands during measurement. This provides the necessary counterpoise for accurate readings.
- Transmit: Briefly press the Push-To-Talk (PTT) button on your two-way radio to transmit. Observe the readings on the SW-33 Plus display.
- Interpret Readings:
- VSWR: A value closer to 1.0 indicates a better match between the radio and antenna, signifying efficient power transfer. Higher values indicate a mismatch.
- FW W (Forward Power): The power transmitted from your radio towards the antenna.
- RW W (Reflected Power): The power reflected back from the antenna to the radio due to impedance mismatch. Lower reflected power is desirable.
7. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the device. Do not use liquid cleaners or solvents.
- Battery Care: To prolong battery life, avoid fully discharging the device frequently. Recharge the battery when the charge indicator suggests low power. If storing for extended periods, charge the device every few months.
- Storage: Store the meter in a cool, dry place away from direct sunlight and extreme temperatures. Keep it protected from dust and physical impact.
- Connector Care: Keep the SMA connectors clean and free from debris. Avoid overtightening connections, which can damage the connectors.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Low or depleted battery. | Charge the device using the Micro USB cable. |
| Inaccurate SWR/Power readings. |
|
|
| Device not working with my radio. | Radio is a DMR digital type. | The SW-33 Plus is not compatible with DMR digital radios. This is a known limitation. |
| Display is difficult to read. | Display orientation. | Briefly press the power button to cycle through display modes (including 90° and 180° rotation) to find the most comfortable viewing angle. |
9. Specifications
| Feature | Detail |
|---|---|
| Max Power | 0.1 - 100W |
| F.S.W.R. | 1.00~19.9 SWR |
| Detection Sensitivity | 3W Min. |
| Frequency Range | 125MHz-525MHz |
| Power Input | 5V (Micro USB) |
| Li-ion Battery | 3.7V 500mAh (included) |
| Input/Output Impedance | 50Ω |
| Interface | SMA female |
| Accuracy | mean +/- 5% |
| Item Weight | 5.6 ounces (160 Grams) |
| Product Dimensions | 0.98 x 0.98 x 2.36 inches |
| Color | Black |
| Water Resistance Level | Not Water Resistant |
10. Warranty and Support
Mcbazel products are manufactured to high-quality standards. For specific warranty information, please refer to the documentation included with your purchase or visit the official Mcbazel website. If you encounter any issues or require technical assistance, please contact Mcbazel customer support through their official channels. When contacting support, please have your product model (SW-33 Plus) and purchase information readily available.
