1. Introdución
This manual provides detailed instructions for the operation and maintenance of your Surecom SW-33 Mark II Mini Digital VHF UHF Two-Way Radio Handheld Power & SWR Meter. This device is designed to accurately measure the forward power, reverse power, and Standing Wave Ratio (SWR) of your VHF and UHF radio systems. Proper use ensures optimal performance and longevity of your equipment.
2. Contido do paquete
Verifique que todos os elementos que se indican a continuación estean incluídos no seu paquete:
- 1x Surecom SW-33 Mark II Digital Power & SWR Meter
- 1x SMA Dummy Load
- 1x cable de carga USB
- 1x Manual de usuario en inglés
- Various SMA adapters for compatibility

Figura 2.1: Unha imaxe completa view of all items included in the product package.
3. Produto rematadoview
The Surecom SW-33 Mark II is a compact and robust device designed for ease of use. It features a clear digital display and intuitive controls.
3.1 Compoñentes físicos
- Top Connector: Used for connecting antennas or dummy loads.
- Conector inferior: Used for connecting to your radio device.
- Botón de encendido: Located on the front, used to turn the device on/off and cycle through display modes.
- Porto micro-USB: Located on the top, used for charging the internal battery.
- Indicador LED: Next to the Micro-USB port, indicates charging status (red for charging, green for fully charged).
- Pantalla dixital: Shows SWR, Forward Power (FW), and Reverse Power (RW) values.

Figure 3.1: Detailed diagram highlighting the main components and connection points of the SW-33 Mark II.

Figure 3.2: An illustration of the meter's display, indicating how power and SWR values are presented.
3.2 Initial Power-On Display
Upon startup, the meter's digital display will show three sets of values: SWR, Forward Power (FW), and Reverse Power (RW). You can cycle through these displays by briefly pressing the power button.
4. Configuración
4.1 Carga do dispositivo
- Locate the Micro-USB charging port on the top of the meter.
- Connect the provided USB charge cable to the meter and a suitable 5V USB power source.
- The LED indicator next to the port will illuminate red while charging.
- O indicador LED acenderase en verde cando a batería estea completamente cargada.

Figure 4.1: The meter being charged via its convenient Micro USB port.
4.2 Acendido/Apagado
Para acender o dispositivo, manteña premido o botón de acendido durante uns segundos ata que a pantalla se ilumine. Para apagalo, manteña premido o botón de acendido de novo ata que a pantalla se apague.
5. Operating Instructions: Power Measurement
Follow these steps to measure the RF power output of your radio device:
- Ensure the meter is adequately charged.
- Connect your radio device to the bottom connector of the SW-33 Mark II. Use appropriate adapters if necessary (included in the package).
- Connect a suitable dummy load to the top connector of the SW-33 Mark II. Ensure the dummy load can handle the maximum power output of your radio.
- Power on the SW-33 Mark II. Press the power button until the indicator light is at the top left, displaying FW (Forward Power) values.
- Hold down the Push-To-Talk (PTT) button on your radio for a few seconds.
- Observe the FW value on the meter's display. This indicates the forward power output of your radio.

Figure 5.1: Visual guide demonstrating the correct setup for measuring the transmit power of a two-way radio.
Video 5.1: Demonstration of the SW-33 Plus 100W 125-525 MHz Power & SWR Meter, showcasing its features and operation for power and SWR measurements.
6. Operating Instructions: SWR Measurement
Follow these steps to measure the SWR of your antenna:
- Ensure the meter is adequately charged.
- Connect your radio device to the bottom connector of the SW-33 Mark II. Use appropriate adapters if necessary.
- Connect the antenna you wish to test to the top connector of the SW-33 Mark II. Ensure the antenna is positioned vertically and there are no obstructions nearby.
- Power on the SW-33 Mark II. Press the power button until the indicator light is at the middle left, displaying SWR values.
- It is recommended to test with your radio device set to high power for more accurate results.
- Hold the meter steadily and hold down the Push-To-Talk (PTT) button on your radio for a few seconds.
- Observe the SWR value on the meter's display. An SWR value closer to 1.0 indicates better antenna performance and a good match.

Figure 6.1: Visual guide demonstrating the correct setup for measuring the Standing Wave Ratio (SWR) of an antenna.
Video 6.1: A detailed guide on how to use the Surecom SW-33 meter for both power and SWR measurements with a two-way radio.
7. Especificacións
| Dimensións do produto | 7.28 x 1.77 x 4.8 polgadas |
| Peso do elemento | 8.1 onzas |
| Número de modelo do artigo | msc-030048 |
| Baterías | Requírese 1 batería de iones de litio (incluída) |
| Características especiais | UHF, VHF, Digital Readout |
| Cor | Negro |
| Fabricante | Surecom |
| Rango de frecuencias | 125-525 MHz |
| Potencia máxima | 100 W |
8. Mantemento
- Limpeza: Usa un pano suave e seco para limpar o exterior do dispositivo. Non empregues produtos químicos agresivos nin produtos de limpeza abrasivos.
- Almacenamento: Garde o medidor nun lugar fresco e seco, lonxe da luz solar directa e de temperaturas extremas.
- Coidado da batería: For optimal battery life, avoid fully discharging the battery frequently. Recharge the device regularly, especially if it will not be used for an extended period.
- Conectores: Keep connectors clean and free from dust or debris to ensure reliable connections.
9 Solución de problemas
| Problema | Causa posible | Solución |
|---|---|---|
| O dispositivo non se acende | Batería baixa; o botón de acendido non se premeu correctamente | Charge the device; Press and hold the power button for a few seconds |
| Inaccurate SWR/Power readings | Loose connections; Incorrect adapter usage; Antenna not tuned; Radio power setting too low | Ensure all connections are secure; Use correct adapters; Adjust antenna for optimal SWR; Set radio to high power for testing |
| O LED de carga non se acende | Faulty USB cable/power source; Device already fully charged | Try a different USB cable or power source; Check if the LED is green (fully charged) |
10. Garantía e soporte
Para obter información sobre a garantía ou asistencia técnica, consulte a documentación proporcionada coa súa compra ou póñase en contacto directamente co vendedor. Garde o comprobante de compra para calquera reclamación de garantía.