Electronics > Projects, Designs, and Technical Stuff
RF Power Meter Modules
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sundance:
Just found these low cost RF power meter modules on ebay:
  https://www.ebay.de/itm/RF-Power-Meter-Range-0-1-2-4GHz-Radio-Frequency-Power-Meter-1nW-1W-65-0-dBm/162320101042
  https://www.ebay.de/itm/LCD-1-600-MHz-RF-Leistung-Messgerat-Dynamometer-6-12V-Power-Meter-Detektor-Board/283445957585
  https://www.ebay.de/itm/1-500Mhz-OLED-RF-Power-Meter-70-15dBm-1nW-2W-Power-Set-RF-Attenuation-Value/254042115299
or the like

Has anybody tested those?
How much accuracy can you expect?
cjheath:
It's almost certainly based on an AD8307 followed by an op-amp feeding a micro-controller ADC pin. Search for the data sheet of the AD8307 and you can learn all about it. Search for other modules that include the chip and you'll find further alternatives.
kirill_ka:
If you use word "accuracy", then you probably don't want those modules.
You can do some comparative measurements, not absolute. Even that would suck because of bad VSWR.
sundance:
That's kinda disappointing since those logarithmic detectors from Analog (like AD8318) claim to have a "High accuracy: ±1.0 dB over 55 dB range (f < 5.8 GHz)".
Maybe SV1AFD's project (https://www.sv1afn.com/ad8318.html) would be a better choice though having twice the price tag + you need a backend for a digital display.
kirill_ka:

--- Quote from: sundance on April 13, 2019, 08:52:03 am ---That's kinda disappointing since those logarithmic detectors from Analog (like AD8318) claim to have a "High accuracy: ±1.0 dB over 55 dB range (f < 5.8 GHz)".

--- End quote ---
The point is that you need to calibrate it at the specific frequency to get this performance.
You can't do it without a "real" RF power meter (HP, Anritsu, R&S, Gigatronics, etc.).
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