In fw release at bottom of topic i write
!!!! V2Plus4 firmware work only on old V2Plus4 devices, new V2Plus4 devices have different LCD module not supported by this fw. As last V2Plus4 sources (software and hardware info) closed i not support it. !!!
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Thank you! That is what I was planning on doing, unfortunately no access to lab grade loads. I'll have to do the best I can... Tim K4SHF On Sat, Dec 18, 2021 at 7:46 PM Donald S Brant Jr <dsbrantjr@...> wrote: I would use a known-good set of calibration standards to calibrate the
VNA, then measure the other standards to judge their quality.
On a related subject, measuring a load or other calibration standard by
putting it back after using it to calibrate the system "to check the
calibration" will only measure your connection repeatability. The
standard will always measure as perfect (or nearly so) because the system
has essentially been told via the calibration standards definitions "this
is a perfect 50¦¸ termination" even if it is not.
73, Don N2VGU
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Re: NanoVNA as a Signal Generator
Another reason to include a high value series resistor (high, meaning a
few thousand ohms) is to reduce the load placed on the circuit under
test by the signal injection probe. The impedance looking into either
of the ports of the VNA is about 50 ohms. Many circuits that you might
want to test will have a much higher impedance to ground. Connecting a
low-impedance probe would almost short-circuit the circuit being tested.
The injection probe's series impedance could be made high using either a
high value resistor, or a small value capacitor (high reactance).
A note on "sweeping": the VNA probably does not continuously sweep the
frequency, but most likely jumps the frequency from one value to the
next, so that, if the VNA is set to cover 3 to 4 MHz with 100 points,
the frequency will make 100 jumps (steps) of 10kHz.
Dave WA8YWQ
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On 2021-12-18 16:17, W0LEV wrote: ONE CAUTION: You are using a decoupling capacitor. If you are coupling to
anything like vacuum tube circuits with high voltages, the spike which
occurs when you initially connect the "test end" of the decoupling
capacitor to your circuit could produce enough voltage impulse to damage
the input of the VNA. That rapid spike will propagate RF energy from the
small arc right into the NANO. I'd Strongly recommend some reasonably high
series resistance between the "test end" of our decoupling capacitor and
the circuit under test. After all, the NANOs operate on 3.5 volts and
even small sparks or arcs potentially produce RF energy from DC to
light.......
Dave - W?LEV
On Sun, Dec 19, 2021 at 12:03 AM N5SE <bwmoore@...> wrote:
Coming along nicely here, but here are some questions that might need
answers or indicate a need for more research:
1. One of the roles i am hoping the nanoVNA will fill is that of signal
generator. I want to program the device for the desired sweep frequencies,
use a cable from ch0 to a female F coax adaptor to a home brew coupling
capacitor DC isolation probe. The probe will supply a grounding clip. I
will not have anything going to ch1. I will use the probe to inject the
swept frequencies from ch0 into live circuits either to trace via other
devices, or to evaluate the circuit. Will this damage the device? Should I
leave ch1 open or short it?
2. If I understand what I have read, calibration establishes the
scaling relationship between the input parameters and output results. If
not calibrated for each set of input parameters, then the output results
are unreliable. This is taking the BIG VIEW as a general statement. I am
sure some parameters may be changed without re-calibrating but I am too
inexperienced to know what they are.
3. If (2) is correct, then the only time you HAVE to re-calibrate is
when you are interested in the results.
4. Even if (2) is correct, best to get into the habit of calibration
every time I turn it on or change parameters; like socks before shoes.
I have read the Guide and watched the videos. I mainly want to validate my
interpretation of all I looked at. Also, I have not found much of anything
about a capacitor for DC isolation.
All comments appreciated,
Billy
< [cid:55e85da0-003e-40c5-814b-f75d440c91ee][cid:2f624a96-5108-43a9-89db-54f54c537d27]< ><>
--
*Dave - W?LEV*
*Just Let Darwin Work*
|
I would use a known-good set of calibration standards to calibrate the VNA, then measure the other standards to judge their quality.
On a related subject, measuring a load or other calibration standard by putting it back after using it to calibrate the system "to check the calibration" will only measure your connection repeatability. The standard will always measure as perfect (or nearly so) because the system has essentially been told via the calibration standards definitions "this is a perfect 50¦¸ termination" even if it is not.
73, Don N2VGU
|
Re: NanoVNA as a Signal Generator
ONE CAUTION: You are using a decoupling capacitor. If you are coupling to
anything like vacuum tube circuits with high voltages, the spike which
occurs when you initially connect the "test end" of the decoupling
capacitor to your circuit could produce enough voltage impulse to damage
the input of the VNA. That rapid spike will propagate RF energy from the
small arc right into the NANO. I'd Strongly recommend some reasonably high
series resistance between the "test end" of our decoupling capacitor and
the circuit under test. After all, the NANOs operate on 3.5 volts and
even small sparks or arcs potentially produce RF energy from DC to
light.......
Dave - W?LEV
toggle quoted message
Show quoted text
On Sun, Dec 19, 2021 at 12:03 AM N5SE <bwmoore@...> wrote: Coming along nicely here, but here are some questions that might need
answers or indicate a need for more research:
1. One of the roles i am hoping the nanoVNA will fill is that of signal
generator. I want to program the device for the desired sweep frequencies,
use a cable from ch0 to a female F coax adaptor to a home brew coupling
capacitor DC isolation probe. The probe will supply a grounding clip. I
will not have anything going to ch1. I will use the probe to inject the
swept frequencies from ch0 into live circuits either to trace via other
devices, or to evaluate the circuit. Will this damage the device? Should I
leave ch1 open or short it?
2. If I understand what I have read, calibration establishes the
scaling relationship between the input parameters and output results. If
not calibrated for each set of input parameters, then the output results
are unreliable. This is taking the BIG VIEW as a general statement. I am
sure some parameters may be changed without re-calibrating but I am too
inexperienced to know what they are.
3. If (2) is correct, then the only time you HAVE to re-calibrate is
when you are interested in the results.
4. Even if (2) is correct, best to get into the habit of calibration
every time I turn it on or change parameters; like socks before shoes.
I have read the Guide and watched the videos. I mainly want to validate my
interpretation of all I looked at. Also, I have not found much of anything
about a capacitor for DC isolation.
All comments appreciated,
Billy
<
[cid:55e85da0-003e-40c5-814b-f75d440c91ee][cid:2f624a96-5108-43a9-89db-54f54c537d27]< ><>
--
*Dave - W?LEV*
*Just Let Darwin Work*
|
NanoVNA as a Signal Generator
Coming along nicely here, but here are some questions that might need answers or indicate a need for more research:
1. One of the roles i am hoping the nanoVNA will fill is that of signal generator. I want to program the device for the desired sweep frequencies, use a cable from ch0 to a female F coax adaptor to a home brew coupling capacitor DC isolation probe. The probe will supply a grounding clip. I will not have anything going to ch1. I will use the probe to inject the swept frequencies from ch0 into live circuits either to trace via other devices, or to evaluate the circuit. Will this damage the device? Should I leave ch1 open or short it?
2. If I understand what I have read, calibration establishes the scaling relationship between the input parameters and output results. If not calibrated for each set of input parameters, then the output results are unreliable. This is taking the BIG VIEW as a general statement. I am sure some parameters may be changed without re-calibrating but I am too inexperienced to know what they are.
3. If (2) is correct, then the only time you HAVE to re-calibrate is when you are interested in the results.
4. Even if (2) is correct, best to get into the habit of calibration every time I turn it on or change parameters; like socks before shoes.
I have read the Guide and watched the videos. I mainly want to validate my interpretation of all I looked at. Also, I have not found much of anything about a capacitor for DC isolation.
All comments appreciated,
Billy
<>[cid:55e85da0-003e-40c5-814b-f75d440c91ee][cid:2f624a96-5108-43a9-89db-54f54c537d27]<><>
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Hi Tim, Better to post this on " [email protected]" I hope you get the right answer. Guido on7ch
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Top Larry !! Happy Christmas and NY
JP
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"The envelope please." You forgot the holes for my notebook. (just kidding) GREAT JOB. Full thanks for sure. Mike C. On 12/17/2021 1:21 PM, Larry Rothman wrote: Folks,
I have been keeping track of all of DiSlord's firmware updates, bug fixes and design notes for the past 1.5 years and have compiled a hu ?? <snip>
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Thanks! I'll take a look...
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On Sat, Dec 18, 2021 at 2:22 PM W0LEV <davearea51a@...> wrote: Dynamic range: After a cal and with nothing connected and at the
frequency(ies) of interest, what is the displayed noise floor? That will
give you a good idea of your dynamic range.
Dave - W?LEV
On Sat, Dec 18, 2021 at 6:54 PM Tim K4SHF <timothytapio1@...> wrote:
I have several sets of calibration loads, I'm curious as to how good they
are. To characterize the unused ones, is that as simple as using one set to
calibrate and then measuring the rest? I'm not sure if that is the correct
method.
How do I measure the dynamic range? I have no clue other than connecting to
some rf duplexer cavities and see how low I go with the dip. Is that
reasonable method or is there an easier way?
TIA
Tim K4SHF
--
*Dave - W?LEV*
*Just Let Darwin Work*
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Dynamic range: After a cal and with nothing connected and at the
frequency(ies) of interest, what is the displayed noise floor? That will
give you a good idea of your dynamic range.
Dave - W?LEV
toggle quoted message
Show quoted text
On Sat, Dec 18, 2021 at 6:54 PM Tim K4SHF <timothytapio1@...> wrote: I have several sets of calibration loads, I'm curious as to how good they
are. To characterize the unused ones, is that as simple as using one set to
calibrate and then measuring the rest? I'm not sure if that is the correct
method.
How do I measure the dynamic range? I have no clue other than connecting to
some rf duplexer cavities and see how low I go with the dip. Is that
reasonable method or is there an easier way?
TIA
Tim K4SHF
--
*Dave - W?LEV*
*Just Let Darwin Work*
|
I have several sets of calibration loads, I'm curious as to how good they
are. To characterize the unused ones, is that as simple as using one set to
calibrate and then measuring the rest? I'm not sure if that is the correct
method.
How do I measure the dynamic range? I have no clue other than connecting to
some rf duplexer cavities and see how low I go with the dip. Is that
reasonable method or is there an easier way?
TIA
Tim K4SHF
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Hi Antonio
Greetings from New ZealandIf I am reading your post correctly, you changed a comma to a full stop to get your nano working on Win 10?
My nano already works on win 10, but does not work on win 7
The light has come, and I have changed the decimal comma, (,) by the decimal point. (.) In my W10-64bits configured for Spanish language and VOIL?!.
Which file are you editing ?
cheers
joe
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Check that the screen bezel is not compressing the edge of the touch screen.
Mine had this problem.
Terry Bullett W?ASP
tbullett@...
Life is Complex. It has Real and Imaginary parts.
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On Dec 18, 2021, at 09:20, k4byf@... wrote:
?I recently purchased a NanoVNA-H4 from a dealer at a local hamfest. I
have found that the touch screen is intermittent making it almost
impossible to use the menu. Has anyone found a fix or suggestion for
this problem ?
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Have you made the calibration of "Touch Cal" and the "Touch Test"?
Antonio - EA7HJ
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Re: NanoVNA v1.1.00 fw pack for all H / H4 / LiteVNA / V2 / V2Plus / V2Plus4
#firmware
DiSlord,
FYI - It looks like you've reached the maximum you're allowed to receive via PayPal with your current account settings. Until fixed, no one can send you any more money.
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I recently purchased a NanoVNA-H4 from a dealer at a local hamfest. I
have found that the touch screen is intermittent making it almost
impossible to use the menu. Has anyone found a fix or suggestion for
this problem ?
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Larry,
I appreciate the effort.
DiSlord and Larry, what a pair!
Mike N2MS
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On 12/17/2021 1:21 PM Larry Rothman <nlroth@...> wrote:
Folks,
I have been keeping track of all of DiSlord's firmware updates, bug fixes and design notes for the past 1.5 years and have compiled a huge list of forum posts that have been converted to a PDF file with all design ideas and configuration info referenced in one place! (100 pages)
DiSlord formally released V1.1.00 today on his Github page
So - I've added that info to this updated document and will post it in the files sections on both the NanoVNA-Users group and the Beta Testers group.
As DiSlord mentioned, this document is a great source of all the enhancements that have been made to the NanoVNA ans extended family of VNA devices.
The document can be referred to for colour codes, how to connect serial and BlueTooth dongles, add RTC xtals, SD card slots and much more.
Enjoy - there's a LOT of info !!
Please consider buying DiSlord a beer for his hard work.
His contact info is on the Version page of the firmware.
Cheers,
Larry
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Tim K4SHF
Donald S Brant Jr
N5SE
Jempi ( ON7MA )
Mike C.