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Sub $1000 VNA for antenna matching

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Smokey:

--- Quote from: joeqsmith on November 27, 2022, 06:59:14 pm ---...
FYI on the Lite.
The first one I bought worked well and met the suppliers specs.  A friends had very high noise.  They bought a second and shipped me theirs.  Their second one also had high noise.  After some testing, I found the Lite was very sensitive to the input voltage level from the USB port.  Basically, to get around it, I made a USB cable with a diode in series with the power to lower it.  This solved the problem.   
...

--- End quote ---

I'm looking at getting one of these LiteVNAs.  What should I be looking at, performance wise, to determine if a unit has an issue with the USB voltage? 

joeqsmith:

--- Quote from: Smokey on January 30, 2023, 01:33:00 am ---
--- Quote from: joeqsmith on November 27, 2022, 06:59:14 pm ---...
FYI on the Lite.
The first one I bought worked well and met the suppliers specs.  A friends had very high noise.  They bought a second and shipped me theirs.  Their second one also had high noise.  After some testing, I found the Lite was very sensitive to the input voltage level from the USB port.  Basically, to get around it, I made a USB cable with a diode in series with the power to lower it.  This solved the problem.   
...

--- End quote ---

I'm looking at getting one of these LiteVNAs.  What should I be looking at, performance wise, to determine if a unit has an issue with the USB voltage?

--- End quote ---
I've posted data showing the problem, how I collected it and also how to mitigate it.  Did you have a specific question about that?  I understand they released an update to the hardware to improve its performance.  Someone had asked how it compared with what I had shown.  There was no response from the designers and all went silent.  You can find that on the LiteVNA groups.io.   

Smokey:
Cool.  Thanks for the info.  I think this is the forum post regarding the power supply update:
https://groups.io/g/liteVNA/topic/the_new_litevna64_which/93138117

The last messages are from 11/11/22 and claim the distributors like randl.com have the 64.0.3.1 version.

joeqsmith:
Yes, that is the thread.   Looks like it grew a bit. 

If you buy one, I would be interested in having you run a simple test just to get some idea how much they improved it compared with my stock one. 

Smokey:

--- Quote from: joeqsmith on January 30, 2023, 07:38:44 pm ---Yes, that is the thread.   Looks like it grew a bit. 

If you buy one, I would be interested in having you run a simple test just to get some idea how much they improved it compared with my stock one.

--- End quote ---

It's on it's way.  I'll update when it gets here.

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