Re: Read/Writing calibration data from device memory/registry into computer
With the NanoVNA-H with DiSlord's FW, the calibration data of the 5 config slots is stored in the flash at address 0x08018800. The NanoVNA-H4 has a different memory layout, but with this unit you can use the SD card for storage. Upload data from NanoVNA: - switch into DFU mode, either from menu or with BOOT jumper. dfu-util -d 0483:df11 -a 0 -s 0x08018800 -U CONFIG.bin - switch NanoVNA off to leave DFU mode. To download this calibration data to the NAnoVNA: - switch into DFU mode, either from menu or with BOOT jumper. dfu-util -d 0483:df11 -a 0 -s 0x08018800 -D CONFIG.bin - switch NanoVNA off to leave DFU mode. To make it easier to switch to DFU mode, you can use this small HW mod (with the NanoVNA-H, the resistor does not need to be replaced): /g/nanovna-users/topic/69979852
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Re: Read/Writing calibration data from device memory/registry into computer
Use recall command
recall 0
Now device use 0 slot, and data command load from it
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Re: Read/Writing calibration data from device memory/registry into computer
My understanding is I can get the calibration[LOAD, OPEN, SHORT, THRU, ISOLN]. But how should I know which slot is being read? That is to say, we have 6 slots for saving calibration data on the device and each of them includes SOLT calibration data.
- data [array]
Get complex data
0: S11, 1: S21,
2: CAL_LOAD, 3: CAL_OPEN, 4: CAL_SHORT, 5: CAL_THRU, 6: CAL_ISOLN
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Re: Read/Writing calibration data from device memory/registry into computer
Only get calibration data command:
data 2
data 3
data 4
data 5
data 6
You can load and apply calicration from slot:
recall {id}
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Re: Replacement of damaged NanoVNA circuit board
#hardware
On 10/5/22 11:45 AM, Costin R wrote: Thanks for the reply, Dave!
I had not seen the exact model of the ESD diode in the link sent. I must
have been careless...
I asked the exact type because in NanoVNA the junction capacity is very
important in order not to influence the measurements. I see in the catalog
of this diode a capacity of 0.05pF, which is very good for this application.
As for soldering, I have all the necessary tools for Safe ESD operations,
good eyes (;-) with glasses) and a magnifying glass with light.
Regards,
Costin
Interestingly, in this application low C is nice, but not necessary. The calibration process would take out the shunt C, just as if you had a foot of coax or twisted pair. The potential "bad" effects are two fold: 1) the shunt C reduces the signal level, so the sensitivity of the receiver is less. 2) it is a semiconductor junction, so the possibility of IMD is there.
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Read/Writing calibration data from device memory/registry into computer
I am trying to automate my project. For this, I would need to read the stored calibration data from the device and save it to my pc, and then load it back when necessary. Preferable to automate this process using MATLAB/commands. I was wondering in which registry the calibration data stored are stored in nanovana and how can I read and write to it after connecting the device using matlab.
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Re: Replacement of damaged NanoVNA circuit board
#hardware
Thanks for the reply, Dave! I had not seen the exact model of the ESD diode in the link sent. I must have been careless... I asked the exact type because in NanoVNA the junction capacity is very important in order not to influence the measurements. I see in the catalog of this diode a capacity of 0.05pF, which is very good for this application. As for soldering, I have all the necessary tools for Safe ESD operations, good eyes (;-) with glasses) and a magnifying glass with light. Regards, Costin ?n mie., 5 oct. 2022 la 20:58, Dave via groups.io <dvfuller= [email protected]> a scris:
I used Mouser PN 652-CG0603MLU-05E. All the information was in the link
that I gave above. They are tiny and you need a fine tip low wattage
soldering iron. Good luck
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Re: Replacement of damaged NanoVNA circuit board
#hardware
I used Mouser PN 652-CG0603MLU-05E. All the information was in the link that I gave above. They are tiny and you need a fine tip low wattage soldering iron. Good luck
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Re: New member with a NanoVna H4
That latest firmware from DisLord , V1.2.00 adds the following :-
additional 4 admittance marker format and Admittance background
G + jB
G + L/C
Rp + jXp
Rp + L/C
? Add text keyboards for input filenames (max 8 chars on H and 18 on H4)
? Progress bar on screenshots
? Remote Desktop (work in NanoVNA-App, translate screen to CPU)
? Add flip display option
? More stable work on harmonics
? Speedup and reduce code in math/fft operations
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Re: New member with a NanoVna H4
Thanks for all the good info. I apologize for getting off topic. So getting back to firmware...
I've learned over the years not to toy with flashing firmware unless there is a problem that absolutely must be addresses or a feature one cannot live without.
Since I mainly use the NanoVNA for tuning antennas and feedlines, and I use it stand alone with no PC, will the newest firmware add any features that will make this process easier?
Bryan
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Re: New member with a NanoVna H4
Anything other than 50Ohm j0=0 is a loss.? So trotting along the 50Ohm line is also lossy.Total impedance involves both the real and imaginary parameters.
Mike W9MDB
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On Tuesday, October 4, 2022 at 03:34:47 PM CDT, Donald S Brant Jr <dsbrantjr@...> wrote: On Tue, Oct? 4, 2022 at 02:55 PM, Jim Lux wrote:
for a given length, you get a circle/spiral on the Smith chart of values
Assuming a lossless transmission line stub, the Smith Chart trace will move along the outer edge of the chart as the frequency/electrical length changes; losses bring it spiraling in from the edge.? 73, Don N2VGU
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Re: Replacement of damaged NanoVNA circuit board
#hardware
Hi Dave & Friends! What is the working voltage of ESD suppressor diodes? What model did you use? ?n mar., 4 oct. 2022 la 22:48, Dave via groups.io <dvfuller= [email protected]> a scris:
If you want ESD protection on your VNA or tinySA refer to this group's
thread. I ordered these ESD protection diodes and installed them in my two
tinySAs and my nanoVNA. They work perfect.
/g/tinysa/topic/81827330#4676
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Thanks. Downloaded and having a good read. Regards Rob aka G4ZEO
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I tried to remove the screen, loosen the screws, use it without the screen, but the problem is always the same: it gives me the first drop-down menus but not the submenus.
Please help me, I need the nanovna, for checks. Thanks Best regards Claudio
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Re: New member with a NanoVna H4
On Tue, Oct 4, 2022 at 02:55 PM, Jim Lux wrote:
for a given length, you get a circle/spiral on the Smith chart of values
Assuming a lossless transmission line stub, the Smith Chart trace will move along the outer edge of the chart as the frequency/electrical length changes; losses bring it spiraling in from the edge. 73, Don N2VGU
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Re: New member with a NanoVna H4
On Tue, Oct 4, 2022 at 02:00 PM, Lester Veenstra wrote:
Yes keeping in mind the termination need to be a short or open.
If the termination is lossy (other than 0 or ¡Þ¦¸) the result at the other end of the stub will be a lossy inductive or capacitive element. I learned this when using ¦Ë/4 stubs to bias microwave transistors; you need high-Q caps at the ground end of the stub; any losses there are transformed to losses at the device end. 73, Don N2VGU
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Thank you for speedy reply. I am a complete novice in this area. I bought it to check my antenna. I usually update my devices if needed first. I am at a loss to understand all the / parameters etc and choose the correct one. I do understand the update process and have it working via my Windows 10 pc.. thanks one again.
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Re: New member with a NanoVna H4
Thanks, Jim! How quickly we forget!
Your email is now stored on the HD, printed, and destined to go into my
notebook of indispensable kernels of knowledge.
Dave - W?LEV
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On Tue, Oct 4, 2022 at 6:55 PM Jim Lux <jimlux@...> wrote: On 10/4/22 11:00 AM, Lester Veenstra via groups.io wrote:
Yes keeping in mind the termination need to be a short or open.
Then as a function of length and frequency any +/- imaginary value (C or L) can be presented at the other end.
Not *any* - for a given length, you get a circle/spiral on the Smith
chart of values
Impedance transformations
If a load of complex impedance Zload is connected to the end of a
transmission line of characteristic impedance Z0 (which may be complex),
the impedance at the other end of the line is Zin, calculated by the
following equation:
Zin = Z0 * (Zload*cosh(gamma) + Z0*sinh(gamma))/
(Zload*sinh(gamma)+Z0*cosh(gamma))
gamma is the complex propagation constant. gamma = alpha + j beta where:
alpha is attenuation in nepers (1 neper = 8.688 dB)
beta is length in radians
Some cases of interest are where alpha=0 (i.e. a lossless line) in which
case the hyperbolic functions turn into their trig equivalents, and
where beta is pi/2 or pi.
If beta = pi/2 (a half wavelength line), then cosh(gamma) = -1 and
sinh(gamma) = 0, so you get:
Zin = Zload
If beta = pi/4 ( a quarter wavelength line), then cosh(gamma) = 0 and
sinh(gamma) = 1, so you get:
Zin = Z0 * Z0/Zload
or, written another way:
Zin * Zload = Z0*Z0
This is the basis of the popular 1/4 wave impedance transformers... To
transform Zin to Zload, you need only construct a quarter wave line with
impedance = sqrt(Zin*Zload)
-- *Dave - W?LEV* *Just Let Darwin Work*
--
Dave - W?LEV
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Re: Replacement of damaged NanoVNA circuit board
#hardware
If you want ESD protection on your VNA or tinySA refer to this group's thread. I ordered these ESD protection diodes and installed them in my two tinySAs and my nanoVNA. They work perfect. /g/tinysa/topic/81827330#4676
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You may find it helpful to read "The absolute beginner's guide" which can
be found in the files section of this group. It has very good basic
information and details on firmware update procedures.
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On Tue, Oct 4, 2022, 11:56 AM Ho-Ro <homuth-rosemann@...> wrote: Hi Rob,
DiSlord supports the NanoVNA-H (and other devices) actively:
Martin
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Ho-Ro
Dave
Donald S Brant Jr