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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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