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Calibration wouldn't be necessary for those users that only do SWR measurements since it is a relative comparison. But beyond that, calibration would be prudent.

 

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I want RF power measurement. Without calibration, it makes no sense and I think the webshop verison should also be calibrated if we want to see real values.

I don't know if the AD8318 has default settings (factory calibration), but I don't think so.

A silly question: does the AD8318 module not need to be covered with metal shield?

Edited by Wreg

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A silly question: does the AD8318 module not need to be covered with metal shield?

It's up to you. I didn't add a shield and no issues have been encountered.

 

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Does anyone have any info on my other question?  (The AD8318 have factory settings and without calibration did anyone take measurement to see how much error there is?)

And one last, then I promise I finished: can this be used to perform an automatic frequency search in some way (say with an arduino program modification)? This can be useful if we do not know the exact frequency.

Edited by Wreg

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1. The Arduino's ADC performance, including accuracy of Vref, is involved too. So even if your power sensor is a perfect match to the one I used, the measurements may be different.

The default AD8317 cal values in the Arduino code were determined from my build. The default AD8318 cal values are estimations. In either case, calibration is required if measurement accuracy is important.

2. The sensor detects RF power by measuring RF current.  It cannot determine frequency.

For budget friendly frequency measurements I suggest a low cost SDR dongle. For example:
https://www.rc-cam.com/forum/index.php?/topic/3891-20-spectrum-analyzer-for-testing-fpv-systems/

 

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