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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Hi Rob,
DiSlord supports the NanoVNA-H (and other devices) actively:
Martin
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Re: New member with a NanoVna H4
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)
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Can anyone tell me the latest version of firmware and link please. Totally confused so far. Thanks
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Re: New member with a NanoVna H4
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.
Lester B Veenstra K1YCM M?YCM W8YCM 6Y6Y
lester@...
452 Stable Ln (HC84 RFD USPS Mail)
Keyser WV 26726
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Bryan Curl Sent: Tuesday, October 04, 2022 1:52 PM To: [email protected]Subject: Re: [nanovna-users] New member with a NanoVna H4 Lester, Sorry to scope creep on the thread but this is interesting. so you are saying that a parallel tuning stub could be open or shorted and depending on the length to termination, could be seen by the network as an inductance or capacitance? Bryan.
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Re: New member with a NanoVna H4
Lester,
Sorry to scope creep on the thread but this is interesting.
so you are saying that a parallel tuning stub could be open or shorted and depending on the length to termination, could be seen by the network as an inductance or capacitance?
Bryan.
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Re: New member with a NanoVna H4
On 10/4/22 4:35 AM, Bryan Curl wrote: Both articles well done. Thanks. I have had some good success matching antenna impedance using the smith chart but using a chunk of coax for a shunt inductor eludes me. Could that possibly be the shorted tuning stub as apposed to the open ended one? Yes, you can make inductance or capacitance with a shorted or open stub, with some limitations.
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Re: New member with a NanoVna H4
Both will work, of course, different lengths at a given frequency for the same inductance or capacitance at the user's end
Lester B Veenstra K1YCM M?YCM W8YCM 6Y6Y
lester@...
452 Stable Ln (HC84 RFD USPS Mail)
Keyser WV 26726
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Bryan Curl Sent: Tuesday, October 04, 2022 7:36 AM To: [email protected]Subject: Re: [nanovna-users] New member with a NanoVna H4 Both articles well done. Thanks. I have had some good success matching antenna impedance using the smith chart but using a chunk of coax for a shunt inductor eludes me. Could that possibly be the shorted tuning stub as apposed to the open ended one? Anyway, Stan, thanks for the lead to great articles. Regards, Bryan
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Dave
Donald S Brant Jr
Ho-Ro