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Yes, I have noted that the SWR changes when holding the VNA vs. not holding it, and touching the SMA connector vs. not touching it. The readings generally are better when touching vs. not

Ken, the behavior of rubber duckies depends significantly on the radio they are attached to. So, to get reasonably accurate results when measuring them with the nanoVNA, I suggest that you build a

make the swr trace active and then press on calib (without recalibrating) and then save to slot 0 (default slot on boot up) ... i do the same if i want other settings to be saved (be it avg setting or

QUOTE: Be sure to calibrate to the end of the coax at the antenna. Coax will influence the measurements, especially if it is longer than a wavelength. (unless is is electrically an odd multiple of a

Thanks to all for the advice. I have a whole load of rubber duck antennas that I'm checking so see at what range they should work best.? Some of them I don't even know what band they're supposed to

With the second range within the first range, the nanovna does an excellent job of interpolating between the calibration points, and you will get good readings, especially for general tasks like

I myself wouldn't be sure of the results. I would re-calibrate it for 144-148 MHz. Then store in a different memory slot than the one I stored 144-174 MHz in. It only takes a few minutes to calibrate

I would re-calibrate when I change to 144-148 MHz. That way I'd be sure. I'd probably save that in a different memory slot than the 144-174 MHz. Zack

As the second range is well within the first range, you may be able to get away with it, though the ideal way is as Dave has mentioned. 73 Jon, VU2JO [email protected]> wrote:

You will only have valid measurements within the frequency range you calibrated. You can decrease the frequency range and the firmware will interpolate between the calibrated points but the accuracy

Just received my H4. If I calibrate for a range of, say, 144-174 MHz, can I change the range to 144-148 without recalibrating? I guess I'm asking under what circumstances is recalibration

When changing sweep ranges, it's always a good idea to recal. Dave - W?LEV [email protected]> wrote: -- Dave - W?LEV

I'm new to the NanoVNA H-4.? If I calibrate for SWR in the range of 144-174, and then I change the range to, say, 144-148, do I need to re calibrate? IOW, for the purposes of SWR readings, under

By design, slot 0 is activated on power-up, not any other slot. Yes, if you calibrate, then change trace and display options, then save calibration again, it save the currently active calibration

Yes I think the nanovna firmware version needs to be somewhat recent. This capability was added a year or so ago I think. You can also get the current firmware for the H4 from DiSlord's nanovna-d

Stan, Thank you for your tip about the little camera icon in NanoVNA-app. Interesting. I gave it a try. Clicking on it, the pop up screenshot is there, but it updates the small screen only when I

Stan, Thank you for your tip about the little camera icon in NanoVNA-app. Interesting. I gave it a try. Clicking on it, the pop up screenshot is there, but it updates the small screen only when I

It only works for Save 0. Not for other recalls even if I have changed SWR to active trace and made Calibrate > Save. But if I make Calibrate > Calibrate > Done SWR will remain as the active trace. I

Save calibration again after change trace type and settings

When I have made a calibration that firstly involves a SWR trace and secondly a trace for Smith, then the Smith-trace is the active trace. Is it possible to afterwards when having changed so that the