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Even harmonics are caused by asymmetry, right? Is that something that can be controlled in this source chip? Peter

So this is a very busy chart..... apologies but I wanted to try to capture the whole thing in one visual. There are three different sweeps captured here in peak hold mode. The traces are identified at

Can you transfer your OSL calibrated data into Excel and plot the Rigo and nano ouputs on the same graph?Sent from my Samsung Galaxy smartphone.

In that case the square wave is not symmetrical mark space <1:1. Makes the output frequencies? dependent on this mark space. But how do they boost the 3rd harmonic without boosting the second

@tim Hello Tim, Could you please explain how you got nanoNVASharp to run under Linux/wine. What DLL's need to be included? The USB/serial port adoption is explained in:

Tuck While the second harmonic is not used, it is very prominent in the output of the VNA. Please refer to my earlier S/A plot, repeated below. It is approximately the same level as the desired 3rd

Thanks Warren, you restore my confidence about the laws of physics. The Si 5351 outputs a square wave so can only give odd harmonics.?As long as the DUT is a linear device with no large intermods,

I was wrong about this. Further analysis of the output on a spectrum analyzer reveals the nanoVNA operates at the Si5351 fundamental frequency from 0 - 300MHz and then uses the third harmonic for

Hi Peter The numerical input seems to be a bit flaky on my Nano (which has 2-trace 900MHz antenna analyser firmware), although it works better for CW frequency input than position. Touchscreen

Well, default scale which I assume is 10 dB/div.? I also haven't been able to set the reference position so that is default as well. When I try it goes to some huge number where I can if really

/g/nanovna-users/topic/defective_nanovna/32747641?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,32747641

My previous email should less-non-negatively been: not being specified to 300MHz does not prevent most Si5351's from being overclocked to 300MHz. Arguably, were the SA512 >>less<< nonlinear, second

Thanks I will study the YouTube video. If a DUT is a linear device then harmonic responses will just superpose linearly and I can see one can use DSP software to disentangle them. The SA512 is a non

Yes, the chips can be programmed directly at 300 MHz and actually beyond. When the chip runs out of range it will actually just sit on the previous called for frequency and ignore the command. The

Just because the Si5351 is not specified for 300MHz does not mean that most cannot be overclocked to generate 300MHz fundamentals. Michael Knitter uses the same Si5351 with a weaker processor in his

That is interesting. I have not played with SiLab chips for quite a while being more familiar with the Analog Devices AD98xx families. I couldn't? find in the data sheet if it can be programed

What is the scale of this plot? Is the 900MHz end 40dB RL. It can't? be less than 70dB anywhere if each y grid is 10dB.Sent from my Samsung Galaxy smartphone.

What causes the spike to show at 300 MHz when it switches and what has been done in the later software to get rid of the spike? Burt, K6OQK

What causes the spike to show at 300 MHz when it switches and what has been done in the later software to get rid of the spike? Burt, K6OQK

The nanoVNA begins using the second harmonic as soon as the sweep crosses the 300 MHz threshold and, at the same time, boosts the output level of the Si5351. It does this again at the 600 MHz