Wideband Power Meter with USB Serial

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  • $ 52.00
  • Regular price $ 79.00

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Wideband Power Meters are shipping now! No assembly required!

Have you ever wanted to measure the exact power output from your QRP rig, programmable oscillator, HamShield, 900MHz Explorer Hat, LoRa, WiFi or Bluetooth module? In a simple-to-read output on any computer? Now you can.

Introducing our Wideband Power Meter, the same meter we used to test and prototype our HamShield amplifier stages. This device works like any other serial device. Plug it in and load up your favorite terminal program. It outputs the current power levels in dBm every second. You can measure power from any frequency between 10MHz and 2700MHz! Yes, we know it says 45MHz and above on the silkscreen, but we have done extensive testing to see how it performs outside that range.

Features

  • Works as a USB serial device
  • Built-in 20dB attenuator allows direct measurement of up to +20dBm
  • Measure even higher power with a simple external attenuator 
  • Measure output as low as -34dBm to +20dBm
  • 54dB dynamic range
  • Based on the Analog Devices HMC713MS8
  • Flat, software calibrated response from 39MHz - 2700MHz
  • Extended range operation from 10MHz to 39MHz for HF measurements
  • 50 Ohm SMA RF connection
  • ATMega32U4 controller with open source software
  • Open Source Hardware

Caution: be careful not to exceed the +20dBm input power. If you want to measure higher power levels, purchase our 2 watt 20dB attenuator

 Notes on Measuring with Extended Range

While this chip is mostly flat across the 39-2700MHz range and relies on very little software calibration, we have done some extensive testing to see how non-linear it was at lower frequencies. 

Here is the test report we calibrated against. As you can see, the error becomes unreasonable below 10MHz, so we recommend measuring at 10MHz or higher.

 We have also written a great guide on using your power meter. You can find it here.