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Maximum power when sweeping an antenna with an VNA?
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bayjelly:
When sweeping an antenna with a VNA, is there a maximum output power that is deemed "safe", i.e. that won't cause problems for other users of the swept band? Is -10dBm, which seems to be the default for my VNA, still safe then?
tautech:
Never bothered about this too much as your stimulus is a sinewave whereas most coms are digital.
IIRC everything I did in this thread was at default stimulus levels:
https://www.eevblog.com/forum/rf-microwave/antenna-project-log/
xrunner:

--- Quote from: bayjelly on June 20, 2022, 01:36:52 am ---When sweeping an antenna with a VNA, is there a maximum output power that is deemed "safe", i.e. that won't cause problems for other users of the swept band? Is -10dBm, which seems to be the default for my VNA, still safe then?

--- End quote ---

Not possible to answer in a simple way. It depends on what "band" you are sweeping. What devices use the band, what services use the band ...

It probably wouldn't be much of an issue since sweeping would only momentarily introduce rf into another system, but no one can answer unless more is known.

David Hess:
You could look up the emission limits for Part 15 devices, but in practice the output from a VNA is not powerful enough to matter.
knudch:

--- Quote from: David Hess on June 20, 2022, 04:55:41 am ---You could look up the emission limits for Part 15 devices, but in practice the output from a VNA is not powerful enough to matter.


--- End quote ---

I am no so sure about that.....
0dBm is 107 dBuV and that is a lot if you measure emissions
But antenna type and position, distance to "victim"...factors to take into account
beside those factors already mentioned
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