Re: Hardware deficiencies when measuring high impedance with S21
Most of it is in the initial post, except for software (SimSmith). Plot commands for SimSmith were: Plot("R1", S1.z.R, "¦¸", "y1"); Plot("X1", S1.z.X, "¦¸", "y2"); Plot("Z1", S1.z.M, "¦¸", "y1"); I
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Dragan Milivojevic
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#20773
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Re: Hardware deficiencies when measuring high impedance with S21
This user group is for both versions (I believe) but a new topic would be appreciated.
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Dragan Milivojevic
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#20772
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Re: Hardware deficiencies when measuring high impedance with S21
Firmware clone, especially when it is an open source project is a meaningless term. Hope that clears things up.
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Dragan Milivojevic
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#20771
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Re: Hardware deficiencies when measuring high impedance with S21
You did not provide any detail in your post about your test setup or how you derived R, X and Z from the S21 measurement. I do not recognize the plot formats that you are using. Also you did not
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Roger Need
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#20769
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Re: Hardware deficiencies when measuring high impedance with S21
It's a cool firmware. But I think we have to discuss this in an other group. It's not for V1. -- Klaus, DL5KV
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Klaus W?rner
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#20768
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Re: Hardware deficiencies when measuring high impedance with S21
I'm not sure, but I think there are clones for H4 firmware, too. This ist only a notice of me. Maybe this problem doesn't exist on the V1. I haven't updated the firmware on V1 for a long time. --
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Klaus W?rner
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#20766
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Re: NANOVNA-H GONE NUTS
This has been discussed before: /g/nanovna-users/message/2726 45 messages in thread.
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Larry Rothman
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#20762
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Re: NANOVNA-H GONE NUTS
a number of thread of similar problems on different units. So I don't think a dif mfg is going to solve the problem. One solution in a thread was to add ESD diodes which may be the best solution. Not
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NC4BR
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#20761
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Re: Measuring crystals with NanoVNA. Do the math with my FaseShift Crystal calculator
Wow! Your calculator is great Lex. Thank you for making it available to the rest of us. John AA7US
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AA7US
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#20760
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Re: NANOVNA-H GONE NUTS
TU sir. Yes tried cal right at the terminal no cables. Checked the short and it is. The load is 50 ohms I am too unsure of loading firmware but a Buddy ham offered Thought might hv been a static
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paul kobetz
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#20758
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Re: measuring Capacitance or Inductance
Instead of taking it personally and flying off the handle how about you offer an explanation as to why the Drake engineers put an electrolytic in this spot in the circuit? I posed this to Garey K4OAH
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Jim Shorney
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#20757
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Re: Hardware deficiencies when measuring high impedance with S21
Calibrated with "0 length through", test jig connected to port2 directly: X: [image: image.png] R: [image: image.png] Z: [image: image.png] [email protected]> wrote:
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Dragan Milivojevic
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#20756
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Re: measuring Capacitance or Inductance
Hi Roger Man, it sure did go off topic. (Bypass caps; where did that come from? Should be a whole thread on its own.) All I wanted was for someone to tell me how to use nano to measure caps and inds.
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Ed Krome
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#20755
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Re: NANOVNA-H GONE NUTS
Paul, Don't throw in the towel yet. Did you have the NanoVNA anywhere near a transmitter? I wouldn't put more than about 20 dBm into CH0 or CH1 or you can blow out the front end. Have you tried
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Roger Need
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#20754
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Re: measuring Capacitance or Inductance
Ed, Sorry that this discussion went so far off topic. It would be really interesting to get an answer to your initial question. From reading your posts and looking at your data I think it might be one
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Roger Need
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#20753
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Re: Hardware deficiencies when measuring high impedance with S21
Yes this is true. The "S21 series method" is a way of calculating the complex impedance (R+jX) of a device under test (DUT). Unfortunately it does not work on a NanoVNA-H or -H4 which are 2 port
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Roger Need
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#20752
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Re: Using a nanoVNA to test a transmitter
#newbie
#general_vna
Even a reasonably good 10 dB attenuator makes a good dummy load as the return loss is 20 dB - two passes through the -10 dB circuit. And 20 dB RT amounts to an SWR of 1.02 : 1. So, you not only have a
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W0LEV
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#20751
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Re: Measuring crystals with NanoVNA. Do the math with my FaseShift Crystal calculator
thanks
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Martin Glazer
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#20750
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Measuring crystals with NanoVNA. Do the math with my FaseShift Crystal calculator
My Crystal Measuring Adapter for NanoVNA is almost finished. This will make it much easier to sort out crystals for building filters. Will I do the faseshift calculations by hand? I think not. I'm
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Lex PH2LB
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#20749
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Re: Hardware deficiencies when measuring high impedance with S21
V2 is open source, the later versions are not.
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Dragan Milivojevic
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#20748
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