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I have lost your initial message, but if this is an -H4, isnthe MS/SI option ser correctly? That can change when flashing. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.

Bryan, What was your original firmware version? Have you tried re-flashing back to that version? This would eliminate hardware concerns and focus solely on firmware. I noticed there are 10 issues

COULD IT BE? There are three ranges noted on the back label. 50k-300MHz, 300MHz-900MHz, and 0.9GHz-1.5GHz. If my stimulus start and stop crisses over one of these ranges then I see this happen. So

UPDATE: It seems this only happens when my stop freq is above 300mhz. Is this normal or is my understanding flawed. I may have never noticed this because I don't recall ever using it that high. Bryan,

You might like to include the LiteVNA 64 in your list: https://eleshop.eu/litevna-5341.html Cheers, David -- SatSignal Software - Quality software for you Web: https://www.satsignal.eu Email:

On my H4, I recently started having a problem calibrating. During cal the smith chart is sweeping wildly displaying a lot of straight angled lines about the cursor. In the end the cal fails as

Depends on what you want. The H4 has less frequency range but I like the larger screen. I suppose you could get one of each. Zack W9SZ [email protected]> wrote:

For a newie using wanting to use NanoVNA which is better the NanoVNA F V2 or the H4

TNX for replies following the First Interest Groups Law: "At every question will always follow unwanted suggestions" 73 [email protected]> ha scritto:

Very hard to see what it would do better than the NanoVNA for filters etc You don’t need the excess power and the output range is pretty limited for harmonic filters etc

Here is renormalization in coppermountaintech Analysis > Fixture Simulator > Port Z Conversion https://coppermountaintech.com/help-s4/port-reference-impedance-(z)-c.html Microwave circuit theories -

Roger, I believe DiSlord is indeed asking whether the ability to accurately measure differing DUT input and output ports would be useful. It may not be used often but there are definitely uses for

Roger, I am happy with the in/out impedances being the same. I just didn't want the renormalization feature the disappear. --John

N. I. Yannopoulou and P. E. Zimourtopoulos, "Comparing a NanoVNA with a LabVNA Part 2: Three NanoVNAs, Two H4 NanoVNAs, and One HP 8505A VNA", FunkTechnikPlus # Journal, Issue 36, Friday 31 January

Do you want different impedances on input and output? I believe that is what DiSlord is suggesting... Roger

Smith Chart is only for S11. The Port Z feature also works with S21. Roger

Nizar, I am not sure what you are saying. The existing Port Z function allows one to calculate the S parameters for another system impedance like 75 ohms. For example if a filter had a designed input

Yes NanoVNA 50Om system, but possible use math to see how this DUT measured in different impedance system For this S parameters converts to Z (DUT impedance constant and not depend from measured

Dave, The measurement is indeed made in a 50-ohm system, but given a complete (S11, S21, S22, S12) set of S-parameters in a 50 ohm system, it is possible to calculate what the S-parameters would be in

That isn't the point Dave... When converting back to real values, whether the center 1 represents 50 Ohms or something else makes a difference. Or have I got something wrong here?