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It's a bit more complicated than that. When the resistance at resonance is less than the 50 ohm impedance of the VNA, the reflection is 180 degrees out of phase with the incident signal. This would be

/g/nanovna-users/message/16266 Vince N2JRS

All valid comments, but I'd like to add a bit more :) 1) Antena resonance vs low SWR Those two are not always at the same antenna length/frequency. Resonant antena exhibits only resistance (the real

Which is why it's a good thing that Roger posted on the list <grin>.. redundant paths, always a good thing in communications.. jim

Why the firmware now is removed for the public? I found it very good and would like to recommend it to other users. But if they can't download it, it is of no use.

Some of us don't do facebook... -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be

You can measure resonance with the nano by observing the phase.? When the phase switches from 180 degrees to -180 degrees you have resonance.? But minimum SWR is usually a good enough indicator if

Announced this morning on NanoVNA-F Facebook group

Brian, There is no touch screen controller chip.? The unit uses two analog inputs and two digital pins for the X+Y+X-Y- inputs and outputs.? You can search around the internet for examples how this

Hmmm... I wasn't replying to you, Steve. I was replying to Brian,KI8KY who has a V1 Nanovna and who started this message thread. Also...your snide remarks are not welcome in this forum

Dear Larry, No I did not reflow the flexible connector. The v2 uses plug-in screens, - one reason I chose it. If you had read properly, I was describing an anomoly which no one else seems to have had,

Sorry guys, must have a brain freeze when I wrote part of my response, you are correct the longer the wire, the lower the frequency, so you would be starting off lower than where you want to be and

I think this topic went off on how to measure the test signal levels or something along those lines. What that has to do with Q accuracy is beyond me as it is a ratio as you stated and as those

Thanks Allison!!

Thanks David, that's basically what I did, except that I was only checing the minimum SWR, How should I do to find the resonance freq with nanovna??

Thanks for your answer Dave, in fact there is wire everywhere I guess, the fences of the balcony and I guees many other in the structure of the building.

When I trim an antenna I first measure the resonant frequency.? Then compute the ratio of that to the desired frequency.? Convert that to wavelength, divide by 4 (each side of a dipole is 1/4 wave)

Some antenna materials don't fold, bend, or mutilate. Could cut long, measure the resonant frequency, then reduce in length by a ratio proportional to FreqResonant/FreqTarget. Jerry, KE7ER

Wire diameter, insulation proximity to other object including wood will all make a dipole shorter at lowest SWR. Or otherwise said will load the dipole and make it electrically longer than is is.

On 8/23/20 3:07 PM, davidb1stein@... wrote: <snip> As you get closer to your center frequency, start cutting a shorter amount of wire off the end. Instead of 2-4 inches, now only cut 1 to 1/2