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Thread: NanoVNA-F vs SVA1032x @ 207MHz

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    Default NanoVNA-F vs SVA1032x @ 207MHz

    I wanted to compare the nanoVNA-F to the Siglent SVA1032x so I calibrated them both with the same kit and took screenshots of the 75ohm yagi I made for ch12 OTA TV (207MHz) through about 50' of 75ohm coax (VNA's calibrated to 50ohm). I was surprised how well the nano did in comparison. The reactance was almost identical between the two, but the resistance was a few ohms higher on the nano. I was originally frustrated with the nanoVNA because it gave me horrible readings and consistently failed gamma match adjustments, but now that I updated the firmware (again) on the nano, I must admit, it isn't too bad. I've done 3 firmware updates now in a month or so and I finally found one that works the way I want it to. I'll be comparing the two units at 70cm soon. I also noticed that just about every antenna I connect to, there exists enough common-mode current to significantly change the impedance readings just by touching or approaching the coax which gives me a new appreciation for baluns! I highly recommend a ferrite bead on test coax at the antenna end if you want accurate readings. I use the TKD ZCAT2035-0930 clip-on bead and that works great for me at 2m and up (thats a VHF-UHF ferrite). I now get stable and fairly accurate readings (at least up to 1.25m band) with this cheap nano.



    the firmware thats on my nano (reasonably accurate and has port extensions)
    Last edited by brandon lind; Tue 16th Feb 2021 at 20:33.

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