NISSEI Mini TX-502 SWR/Watt Meter

1. Introduction

The NISSEI Mini TX-502 SWR/Watt Meter is a high-quality instrument designed for measuring Standing Wave Ratio (SWR) and power output (Wattage) across HF, V, and U bands. It features a wide frequency range of 1.6 to 525MHz and can handle power up to 200W. The meter provides direct readings without the need for calibration, utilizing a three-color scale for enhanced readability and an LED backlight for clear visibility in various lighting conditions. Its true directional coupler design ensures improved accuracy across the frequency spectrum.

2. Safety Information

• Always ensure the device is connected to a stable power source within the specified voltage range (9-14V DC).
• Do not exceed the maximum power rating of 200W to prevent damage to the meter or connected equipment.
• Ensure all connections (antenna, radio, power) are secure before operating.
• Avoid exposing the device to moisture, extreme temperatures, or direct sunlight.
• Do not attempt to open or repair the device yourself. Refer to qualified personnel for service.

3. Package Contents

Verify that all items are present in your package:

• 1 x NISSEI Mini TX-502 SWR/Watt Meter
• 1 x 13.8V DC Power Cable
• 1 x User Manual

4. Product Overview

4.1 Front Panel

The front panel features the main analog meter display, which shows both SWR (Standing Wave Ratio) and Wattage (power output). Control elements include:

• NISSEI TX-502 1.6-525MHz Label: Indicates model and frequency range.
• HF/V/UHF Switch: Selects the operating frequency band.
• RANGE Knob (x1, x10, x100): Adjusts the power measurement range.
• LED ON/OFF Switch: Controls the meter's backlight.
• FUNCTION Switch (AVG/PEP): Selects between Average and Peak Envelope Power measurement modes.

4.2 Rear Panel

The rear panel provides all necessary connection ports:

• 12V DC Input: Power connection for the meter.
• ANT Connectors (M-type): Ports for connecting your radio and antenna.
• Product Label: Displays serial number and basic specifications.

5. Specifications

6. Setup

1. Power Connection: Connect the provided 13.8V DC power cable to the 12V DC input port on the rear panel of the TX-502. Connect the other end to a suitable 9-14V DC power source.
2. Radio Connection: Connect your radio's antenna output to one of the 'ANT' M-type connectors on the rear panel.
3. Antenna Connection: Connect your antenna to the other 'ANT' M-type connector on the rear panel. Ensure all connections are tight and secure.
4. Placement: Place the meter on a stable, flat surface, away from direct heat sources or moisture.

7. Operation

1. Power On: Locate the 'ON' switch (often combined with the LED switch) and turn the device on. If desired, switch the LED backlight to 'ON' for improved visibility.
2. Select Frequency Band: Use the 'HF/V/UHF' switch to select the appropriate frequency band for your operation.
3. Select Power Range: Use the 'RANGE' knob (x1, x10, x100) to select a power range that is suitable for your radio's output. Start with a higher range (e.g., x100) if unsure, then adjust downwards for more precise readings.
4. Select Function: Use the 'FUNCTION' switch to select between 'AVG' (Average Power) or 'PEP' (Peak Envelope Power) measurement, depending on your needs. PEP is typically used for SSB transmissions.
5. Transmit and Read: Briefly transmit a signal from your radio. The meter's needle will indicate the SWR and Wattage on the analog display.
6. Interpret Readings:
   • SWR: Aim for an SWR reading as close to 1:1 as possible. High SWR indicates a mismatch between your radio and antenna.
   • Wattage: Read the power output from the corresponding scale, multiplying by the selected 'RANGE' factor (e.g., if range is x10 and meter reads '5', actual power is 50W).
7. Power Off: When finished, turn off the meter using the 'OFF' switch.

8. Maintenance

• Cleaning: Use a soft, dry cloth to clean the exterior of the meter. Do not use abrasive cleaners or solvents.
• Storage: Store the meter in a cool, dry place when not in use, away from direct sunlight and dust.
• Connections: Periodically check all cable connections for wear or damage.

9. Troubleshooting

• No Power:
  • Ensure the 12V DC power cable is securely connected to both the meter and the power source.
  • Verify that the power source is providing the correct voltage (9-14V DC) and is functional.
  • Check the power switch on the meter is in the 'ON' position.
• Incorrect Readings / No Readings:
  • Confirm that the radio and antenna are correctly connected to the 'ANT' ports.
  • Ensure the 'HF/V/UHF' switch is set to the correct frequency band for your operation.
  • Adjust the 'RANGE' knob to an appropriate power scale for your radio's output.
  • Verify that your radio is transmitting power.
  • Check for damaged cables or connectors.
• High SWR Readings:
  • High SWR typically indicates an issue with your antenna system (e.g., antenna length, tuning, feedline). The meter accurately reports the SWR, but does not cause it.
  • Inspect your antenna and feedline for any damage or improper installation.
  • Tune your antenna if it is adjustable.

10. User Tips

No specific user tips were available from customer reviews or Q&A for this product at the time of manual creation. General best practices for SWR/Watt meters include:

• Always use high-quality coaxial cables and connectors to minimize signal loss and ensure accurate readings.
• Regularly check your SWR, especially after making changes to your antenna system or moving your station.
• Understanding the difference between AVG and PEP measurements is crucial for accurate power assessment, particularly for modulated signals like SSB.

11. Warranty and Support

For warranty information, technical support, or service inquiries, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.