Not sure what frequency you are measuring but first do a reset all. In menu buttons.
Set the stimulus 1 MHz to 10 MHz? just for some low hf range.
On the s-a-a-2 my SAA2 port zero is the bottom connection not the top left.
Do a reset then
Do a SOL calibration.
If you get the same results all over the place.
Go to the transform turn it on and off. Observe the display on the Smith chart.
See if you can see something other than garbage. It not then probably the sma connection is broken of the PC board.
De K8HTB Joe
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Yea. Reseted all before ecah cal. Did cal reset and tried reset all and started all over...
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Did you do a reset before each cal?
Dave - W?LEV
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On Tue, Sep 14, 2021 at 10:16 PM <jorksx@...> wrote: Hello. Got my hand on this nanovna v2 plus(?)
Frist time turned it on got ALOT of traces and no idea what to do. After
some tutorials I realased that it might be broken / bricked.
As you can see from the pictures the traces go all over the place and
resistances etc change all the time.
I've calibrated the thing many many times, changed frequency range and
calibrated again, calibrated more, tested antennas.... nothing
Seems like there is no connection between board and sma connector.
I can connect to nanovna-qt and saver. all show same kind of traces. Done
calibration through software and through the screen.
I have updated the firmware to the lastest one. Also tried the
experimental. Still same.
Any ideas?
--
*Dave - W?LEV*
*Just Let Darwin Work*
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Hello. Got my hand on this nanovna v2 plus(?)
Frist time turned it on got ALOT of traces and no idea what to do. After some tutorials I realased that it might be broken / bricked.
As you can see from the pictures the traces go all over the place and resistances etc change all the time.
I've calibrated the thing many many times, changed frequency range and calibrated again, calibrated more, tested antennas.... nothing
Seems like there is no connection between board and sma connector.
I can connect to nanovna-qt and saver. all show same kind of traces. Done calibration through software and through the screen.
I have updated the firmware to the lastest one. Also tried the experimental. Still same.
Any ideas?
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Sorry Larry, I had to run out for an appointment and forgot to snip message.
Mike N2MS
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On 09/14/2021 10:06 AM Larry Rothman <nlroth@...> wrote:
Sorry, should be Michael, not Mario.
On Tuesday, September 14, 2021, 10:05:48 a.m. EDT, Larry <nlroth@...> wrote:
Mario, - calibration does just thet - it calibrates out (ideally, of course) all the variables and takes into account delayes, parasitic LC, etc so that at the reference plane, you have an 'ideal' match with with to test with.
Also, please only enter your replies only once and delete any duplicates as they clog up the forum with 'noise' so to speak.
Thanks
Larry
On Tuesday, September 14, 2021, 09:43:13 a.m. EDT, N2MS <mstangelo@...> wrote:
Larry,
If you do calibration with the adapter installed and the reference plane is at the adapter would you still have to adjust for the electrical delay?
Mike N2MS
On 09/14/2021 8:25 AM Larry Rothman <nlroth@...> wrote:
?
You can do that (I have) but the best way is to calibrate the unit with the adapters installed to move the reference plane to account for them.
? ? On Tuesday, September 14, 2021, 08:08:19 a.m. EDT, Chris Pohlad-Thomas <chrispohladthomas@...> wrote:?
?
? I assume when everyone is using adapters they adjust the electrical delay to account for these?
?
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Re: Measuring crystal parameters with classic NanoVNA?
Thanks, I've updated mine and it works great as well!
M
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Re: Measuring crystal parameters with classic NanoVNA?
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Sorry, should be Michael, not Mario.
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On Tuesday, September 14, 2021, 10:05:48 a.m. EDT, Larry <nlroth@...> wrote: Mario, - calibration does just thet - it calibrates out (ideally, of course) all the variables and takes into account delayes, parasitic LC, etc so that at the reference plane, you have an 'ideal' match with with to test with. Also, please only enter your replies only once and delete any duplicates as they clog up the forum with 'noise' so to speak. Thanks Larry On Tuesday, September 14, 2021, 09:43:13 a.m. EDT, N2MS <mstangelo@...> wrote: Larry, If you do calibration with the adapter installed and the reference plane is at the adapter would you still have to adjust for the electrical delay? Mike N2MS On 09/14/2021 8:25 AM Larry Rothman <nlroth@...> wrote:
?
You can do that (I have) but the best way is to calibrate the unit with the adapters installed to move the reference plane to account for them.
? ? On Tuesday, September 14, 2021, 08:08:19 a.m. EDT, Chris Pohlad-Thomas <chrispohladthomas@...> wrote:?
?
? I assume when everyone is using adapters they adjust the electrical delay to account for these?
?
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Mario, - calibration does just thet - it calibrates out (ideally, of course) all the variables and takes into account delayes, parasitic LC, etc so that at the reference plane, you have an 'ideal' match with with to test with.
Also, please only enter your replies only once and delete any duplicates as they clog up the forum with 'noise' so to speak.
Thanks
Larry
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Show quoted text
On Tuesday, September 14, 2021, 09:43:13 a.m. EDT, N2MS <mstangelo@...> wrote: Larry, If you do calibration with the adapter installed and the reference plane is at the adapter would you still have to adjust for the electrical delay? Mike N2MS On 09/14/2021 8:25 AM Larry Rothman <nlroth@...> wrote:
?
You can do that (I have) but the best way is to calibrate the unit with the adapters installed to move the reference plane to account for them.
? ? On Tuesday, September 14, 2021, 08:08:19 a.m. EDT, Chris Pohlad-Thomas <chrispohladthomas@...> wrote:?
?
? I assume when everyone is using adapters they adjust the electrical delay to account for these?
?
|
Larry,
If you do calibration with the adapter installed and the reference plane is at the adapter would you still have to adjust for the electrical delay?
Mike N2MS
toggle quoted message
Show quoted text
On 09/14/2021 8:25 AM Larry Rothman <nlroth@...> wrote:
You can do that (I have) but the best way is to calibrate the unit with the adapters installed to move the reference plane to account for them.
On Tuesday, September 14, 2021, 08:08:19 a.m. EDT, Chris Pohlad-Thomas <chrispohladthomas@...> wrote:
I assume when everyone is using adapters they adjust the electrical delay to account for these?
|
On 9/14/21 4:58 AM, Chris Pohlad-Thomas wrote: I assume when everyone is using adapters they adjust the electrical delay to account for these? or you calibrate with standards that attach to the adapter, so the adapter is "inside" the calibration plane.
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If the delay of the adapter is significant, then yes. For most of my 900 MHz work it is. For 1 MHz, it isn't.
Op 14-9-2021 om 13:58 schreef Chris Pohlad-Thomas:
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Show quoted text
I assume when everyone is using adapters they adjust the electrical delay to account for these?
|
You can do that (I have) but the best way is to calibrate the unit with the adapters installed to move the reference plane to account for them.
toggle quoted message
Show quoted text
On Tuesday, September 14, 2021, 08:08:19 a.m. EDT, Chris Pohlad-Thomas <chrispohladthomas@...> wrote:
I assume when everyone is using adapters they adjust the electrical delay to account for these?
|
I assume when everyone is using adapters they adjust the electrical delay to account for these?
|
I took a closer look and there are more of these interferences. They are very narrowband. If the measuring point falls farther than the filter band, they are not there. It has nothing to do with the DVB-T TV or the received signal from the neighborhood. The device is disconnected from everything. I checked with an RTL-SDR tuner and I don't see a connection between these signals and what is on the air.
In CW mode, you can see sinusoidal interference on a slight off frequency of these bars. Sample screenshots are attached.
List of problematic frequencies I was able to find:
463.105 - 1dB
463.121 - 1dB
471.222 - 5dB !!!
487.458 - 5dB !!!
498.331 - 1dB
520.026 - 0.3dB
536.230 - 0.5dB
552,472 - 0.5dB
568,753 - 2dB
585,018 - 2dB
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Re: How to set Trace Colors
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Re: Measuring crystal parameters with classic NanoVNA?
Confirming that "-H" variant works on the "Classic" NanoVNA. Just updated it after reading this thread.
Compared with crystal measurements done on SAA-v2 with OjisanKobou FW. There is a little bit of difference, around 100Hz for the series resonance. Most likely because I didn't calibrate the TCXO frequency on either unit. Lm and Cf are very close.
73, Mike AF7KR
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Re: How to set Trace Colors
Colours can only be set through the console when connected to a PC, and the saved.? Please read up on searching the forum - it's the first link at the top of the wiki.? A search of console and color finds this thread.... /g/nanovna-users/topic/84120122#23255It has the info you need.? I have just got an H3 Nano VNA its running ver 1.0.45 (Jan 2021 by @Edy555) of the firmware and when I received I was sure the Traces were all separate Colors (But I may have been mistaken) now however the traces are all the same color. Watching several of the how-to YouTube video I noticed those unit displayed different traces in different colors and have been trying to work out how to get my NanoVNA to display traces in different colors. So it raises a few questions: Is what I'm trying do even possible? If yes, is this a feature of later firmware than what I have? I have search through the Menu and not found anyway to set colors Also trolled through the messages here and likewise I have found and description of how to set the colors on the device. I have Both VNA Saver and VNASharp and while I can see how to set colors in the VNA saver app this does not extend to outputting those colors to the device itself. Any help or guidance would be much appreciated. Phil
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I have just got an H3 Nano VNA its running ver 1.0.45 (Jan 2021 by @Edy555) of the firmware and when I received I was sure the Traces were all separate Colors (But I may have been mistaken) now however the traces are all the same color. Watching several of the how-to YouTube video I noticed those unit displayed different traces in different colors and have been trying to work out how to get my NanoVNA to display traces in different colors. So it raises a few questions:
Is what I'm trying do even possible?
If yes, is this a feature of later firmware than what I have?
I have search through the Menu and not found anyway to set colors Also trolled through the messages here and likewise I have found and description of how to set the colors on the device. I have Both VNA Saver and VNASharp and while I can see how to set colors in the VNA saver app this does not extend to outputting those colors to the device itself.
Any help or guidance would be much appreciated.
Phil
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Re: nanoVNA Output Definitions
DELAY has to be understood here as "Group Delay". It highlights the transit time of a signal through a DUT (Device Under Test) versus frequency. It is usually currently related to transmission measurement (s21).
Its calculation is the mathematical derivative of the phase with respect to frequency. If there is PHASE distortion, i.e. a breakout on its monotonous variation according to frequency, the group delay remains no more at a constant value.
Group Delay = -(1/360)*(phi2-phi1)/(f2-f1)
For the NanoVNA, (f2-f1) is the elementary frequency step (Hz) between two measurement points, which depends of FSTART, FSTOP and choosen number of measurements points (101 ... 401). It means that (phi2-phi1) is the phase value difference (Degrees), between two neighboring measurements points.
Group Delay is a relevant parameter, when for example you consider a non-sinusoidal signal passing through a filter. If Group Delay is not constant, the shape of the signal will be altered at the output of the device, due to a possible time shift on its harmonic components.
A last word about Group Delay when related to reflection measurement (s11). It's less intuitive, but we can consider this example with a DUT which is an opened coaxial cable (length 2 meters), one of my favorite educative DUT ! Here the Group Delay (around 18,2 ns, see snapshot) highlights the total transit time at Port 0 level, i.e. a round trip of the signal through the coaxial cable. From it you can calculate the electrical length of the coaxial cable, and if you know the velocity factor, its physical length.
Round trip : 300.000.000 (m/s) * 18,2 E-09 = 5,46 m
Electrical length : 5,46 / 2 = 2,73 m
Physical length : 2,73 * 0,73 = 1,99 m 0,73 is the velocity factor value for RG58A/U cable type
As advanced firmware for NanoVNA now includes automatic calculation for coaxial length (thanks to DiSlord) based on Smith chart, the previous method is not necessary the most accurate or relevant. It is just for an explanation of Group Delay in s11 measurement context.
Jean-Roger / F6EGK
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Vladimir Lebedev
