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The new Power Mapper 5

The ePix Power Mapper 5 enables you to map the boundaries of a passive UHF antennas field and detect null spots that cause reads to be missed.

Passive UHF antennas can have large variations in signal strength, even quite close to the antenna. This meter allows you to easily detect those variations. It shows the effects of polarization, destructive null cancelations, and ground and water absorption. The meter relies on the power in the radio waves, so it cannot give a fails reading or have a dead battery. Almost 100% of the signal on at the antenna is shown on the meter, giving a massive 20+ meters (60+ feet) range.

View a short video of the Power Mapper and Power Ranger in action.

Purchase the Power Mapper 5 for $215 plus $20 for shipping and handling.

You can also purchase both the ePix Power Mapper and the ePix Power Ranger for $330, including shipping and handling. Add both to cart.

What Can It Do?

  • Accurately maps RFID field pattern at up to 15 meters (45 feet).
  • Shows nulls and dead spots in RF signal.
  • Detect which antenna is transmitting.
  • Shows approximate Radiated Power (EiRP or ERP).
  • Tests polarization of antennas (linear, circular and cross polarized).
  • Ideal for beam angle measurements and antenna direction setup.
  • Pulses to show notify time and other transmit interruptions.
  • Detect cable faults and bad connections easily.
  • Oscilloscope output to show modulation or for data logging the signal strength.
  • Excellent research and teaching tool.
  • It can be mounted permanently in the RF field to monitor or data log the RF power.

Features and Benefits:

  • Frequency range 850MHz to 940 MHz Europe, USA and Fare East frequencies.
  • Tested with Dipole, linear, circular patch and cross polarized antennas.
  • Tested for use to EN302 208, 866 MHz EU standard.
  • Tested for use with 915MHz US FCC approved RFID readers.
  • Tested for use at 922.5MHz China.
  • No Battery -- runs on the transmitter RF power.
  • CE marked and conforms to all known radio standards.
  • RoHs compliant.
  • Does not transmit or radiate any RF signals.
  • Antenna hand-tuned to 908 MHz center frequency.

Dimensions: 109 mm height by 70 mm width by 41 mm depth. 12dB attenuator switch allows for close range measurement


"The ePix Power Mapper helps get the best possible results from any reader. All readers are affected by metals and fluids. Until now, it has been impossible to visualize the RF field and how the reflections become additive or subtractive in different environments. With the ePix Power Mapper, combined with a state-of-the-art enterprise reader such as the Alien ALR-9900+, we can now evaluate a site. Then using the Alien reader's simple setting and antenna angles, we can now avoid problems before the system goes live." -- Alien Technologies

Basic instructions:

Hold the Power-Mapper between your finger and thumb then move the meter slowly around the area you want to test. In general RFID tags take about 1uW to power up, so when mapping the RF field a reading on the power-Mapper of less than 1 indicates that a standard Gen 2 tag may not be readable. Rotate the power meter 90 Degrees to measure power in the horizontal polarisation plane. Use a resistor between the two terminals to calibrate your meter for close proximity measurements.

This meter is very sensitive and is capable of showing clearly the constructive and destructive interference patterns caused by ground bounce or metal objects within the RFID field. Test circular polarised antennas for dead spots using the meter horizontally at 3 to 5 meters range the normal dead zone can be measured. An Oscilloscope can be connected across the data out terminals to show the signal modulation.

In the United States, a meter reading of 100 at three feet of range with the 12dB attenuator switched on indicates approximately 4W EIRP.

In Europe, a meter reading of 100 at one meter range with the 12dB attenuator switched on indicates approximately 2W ERP.

Power Ranger

Also available from ePix is the Power Ranger, a pocket-size indicator for simple quick antenna set-up and testing, with a 5-meter range. This device is typically left at every installation for antenna and system verification. Safety Regulations state that you should not work within 25 centimeters of a 2W ERP transmission.

The Power Ranger can be returned to ePix Ltd. for disposal, and is RoHs-compliant, as well as EN60950 safety-compliant.

You can purchase both the Power Mapper and the Power Ranger for $330, including shipping and handling. Add both to cart.

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