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Cheap USB power meters?

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W4PJB:
Does anyone have experience with the cheap $30-$90 USB power meters available from the usual websites that carry such items? I've watched a few videos, and they actually seem to perform pretty well on CW signals in their "sweet spot", which is about -30dBm to 0dBm.

What I haven't seen is how well do they work on swept signals, such as from an SA or sweep generator? In the videos I've seen the software wants to know what frequency is being measured, presumably to apply some type of correction factor. This of course would not be possible on a swept signal, or even for picking up a harmonic higher up the band.

Pics attached for reference.


Shock:
OP is looking for a USB powered and interfaceable? RF power meter (analyzer).

W4PJB:
Yes, I'd love a "proper" power meter, but as we all know these can be insanely expensive. I've noticed these guys (I'm sure they all run on the same chip) and curious about their performance. Obviously I don't expect them to compare to a multi-thousand dollar Giga-tronics or such, but I don't have those needs, either.

I guess for $30 I'll bite the bullet and give one a test drive! 

4thDoctorWhoFan:
Have you seen this video about the one with the LCD screen.

W4PJB:
Thank you for your reply. Yes, I did see the video from The Signal Path, and as always, it's very educational. But what I am curious about is how well they work on swept signals, and that is not something I have seen anyone try yet.

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