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Maximum power when sweeping an antenna with an VNA?
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Performa01:

--- Quote from: imo on June 21, 2022, 08:39:59 am ---With 100mW into a shortwave antenna (I guess it is -10dBm) you can do a transatlantic QSO  :D

--- End quote ---

-10 dBm is inevitably 0.1 mW.
100 mW would be +20 dBm.
iMo:

--- Quote from: Performa01 on June 21, 2022, 09:07:31 am ---
--- Quote from: imo on June 21, 2022, 08:39:59 am ---With 100mW into a shortwave antenna (I guess it is -10dBm) you can do a transatlantic QSO  :D

--- End quote ---

-10 dBm is inevitably 0.1 mW.
100 mW would be +20 dBm.

--- End quote ---
Ok, thanks, still with 0.1mW you can make a transatlantic QSO then..  :D
pdenisowski:

--- Quote from: jeremy on June 21, 2022, 07:12:46 am ---
--- Quote from: pdenisowski on June 21, 2022, 06:38:57 am ---I worked professionally in interference hunting all across the US and internationally for over a decade.

--- End quote ---

Sorry for going off-topic, but I would be interested to read more about how interference hunting works on a professional level.

--- End quote ---

This series might be a good introduction

https://www.rohde-schwarz.com/us/knowledge-center/webinars/ihunter-webinars_250575.html

And here is an intro whitepaper

https://www.rohde-schwarz.com/us/solutions/test-and-measurement/mobile-network-testing/interference-hunting/white-paper-an-introduction-to-interference-hunting_251161.html

I’m the author of all this content, so if you have any questions, please let me know :)
bayjelly:
Thanks a lot pdenisowski!

Seems it's overall still good to be cautious. As an extreme, I do not think the 0dBm that my VNA's tracking generator could be set to are negligible, as some folks here suggested, but maybe I'm overly cautious?

I also didn't ask for specific bands or situations because I was interested in levels that were generally considered safe. It's easier to know what to do in, say, a HAM radio band, than if the question is just "I wonder what frequencies this funky antenna I built resonates at across the entire range of my VNA".

Worse, there's also the situation where you might end up sweeping something that shouldn't be an antenna, but ends up being one.
TimFox:
FCC Part 15 regs are rather complex, and usually refer to radiated field strength (uV/m) rather than power.
https://transition.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet63/oet63rev.pdf
Note that the complexity is due to different limits depending on the frequency bands.
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