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I forgot to mention that the nano 2.8 hardware is on some old software. My H4 software is also old 1.0.64. It was installed May 31 2021 Fred

My Nano H4 is on a DiSlord version 1.0.64

On Mon, Jun 26, 2023 at 05:25 PM, Roger Need wrote: > Calibrating with the crocodile clips will not give you a good reference plane. > The reason I say this is if you keep them the same distance apart

What code version(s) are on the NanoVNA's?

I am confused. A friend of mine and I are trying to figure out why *my nano H4 and his very early nano vna with the 2.8" screen will both run on his nano saver 0.3.7.* His 2.8 nano runs on my computer

Indeed.. For instance if Z1 = 2 - 1000j and Z2 is 50 + 100j, then gamma = (Z1-Z2)/(Z1+Z2) gamma = 1.215 - 0.124j |gamma| > 1 (and it's not some sort of numerical precision th

Here it is, thanks for taking a minute to look into it.

can you send as attachment your .s2p file I wrote a little software to smooth out the errors. I would see what happens. -- F1AMM Fran?ois De la part de astech119 Envoyé : lundi 26 juin 2023 18:32

We have a little trouble understanding each other. It is not a question of measurement but of calculation. I have an adapter which for a given input impedance returns the impedance Zout =

I'm measuring the group delay of some 60in cables with a NanoVNAH4 and I am getting outliers in the data. I am using nano-vna saver and I have tried both with on board calibration disabled and

Calibrating with the crocodile clips will not give you a good reference plane. The reason I say this is if you keep them the same distance apart when you cal with an open, short and load you will have

It's possible, that with some active systems, you could get a reflection that is bigger than the incident wave (i.e. if the Zload were negative). But I think that for an entirely passive load, the

My study (amateur) concerns the cascading of 2 adapters in 'L' one high pass and the other low pass to carry out two adaptations of impedance at two different frequencies. To generalize the brought

I knew about the phone lines. My problem is that if we calculate the S11 with complex values, it leads, for example, to a ROS which can be negative. S11 is no longer in a circle of radius 1. Is this

Definitely so. When working w

Sure it is: S11 is just a representation of the reflection coefficient on port 1 of the UUT. Generally people use just the log magnitude in dB, but it has a phase, too. Nothing prevents the Z0 being

Hello In the attached formula (ROS.png), as long as Zo is real, even if Zl is complex, everything is fine and S11 remains in a circle of radius 1. and the ROS is between 1 and infinity. If Zo is

This is my test fixture, calibrated at the croc clips. It's not ideal but I'm limited by the length of the coil. Should be OK at my measurement frequency of 70kHz though! -- Mike

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Roger, the method I suggested requires inductance calculated this way. It yields an accurate coil model over a narrow frequency range. To my surprise, it seemed good enough over the whole 3.5-4 MHz