Herb,
I fully agree with your comments,? the NanoVNA is an excellent device and definitely on the money, I read on giithub that Hugen even has idea's to improve the impedance of CH1 !!
When hardware changes are neccessary for that (component changes) , I wonder if I dare to open this nice case.
Best Regards
Jos
Op 26-1-2020 om 14:25 schreef hwalker:
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On Sun, Jan 26, 2020 at 04:38 AM, Jos Stevens wrote:
"This is an eye opener for me, it appears that at start NanoVNA-Saver is using the C0 calibration of NanoVNA, untill now I thought these calibrations were independant."
- It always helps to get a different perspective from someone else. Especially true when you are doing everything "right" and you still get unexplainable results.
"I just made a new 100 Segs calibration. Please see the attached results."
- Your after calibration thru results are definitely on the money.
" NanoVNA-H4 is a great device, just the CH1 impedance could be a bit better and the enclosed 50 Ohms standard I measure (4 point measurement @ 10kHz) 50.940 Ohms, also could be a bit better, I use one that I previously received wich I measure 49.850 OHms and correct it in NanoVna-Saver's "Calibration" window. Yes I can do that for the portsavers also."
- For $60 usd delivered via parcel post, you can't expect too much better quality than what is already in the package. The terminator actually measures better than some name brand units I have, and the return loss is very well behaved. I always keep in mind that hugen developed the NanoVNA to "to attract more young people to pay attention to radio frequency and wireless" and that tempers my expectations regarding any meteorologist level performance. The volume of sales world wide over the past few months indicates he not only has attracted some youngsters to RF measurement techniques, but given some of us older people access to measurement capability that we previously lacked.
Regards,
- Herb
