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You don't even have to consult the Smith Chart. The application has done
that for you. To the left of the Smith Chart, the application has given
you the following information for the three markers you placed:
[image: image.png]

Marker 1: Impedance = 40.1 + j 15.4 ohms
Marker 2: Impedance = 49.4 + j 40.6 ohms
Marker 3: Impedance = 99.2 + j 58.2 ohms

There's lot's more information, but everything is inductive - plus sign to
the complex portion of the impedance. This would indicate the wires are a
bit too long. Although the match at the lowest frequency, Marker 1 at
28.300 MHz, is not bad at all and nothing to be concerned about. Still at
Marker 2 at 29.000 MHz, not bad. However, the last marker at 29.700 MHz is
beginning to show some compromises.

The SWR is also given at the top of the second column for each marker
frequency.

Dave - W?LEV


On Wed, Jan 15, 2025 at 12:00?AM David Gerhart via groups.io <DAVID=
[email protected]> wrote:

Fresh out of box. A sweep of my DIY 10M antenna...

S1 - connected to 50' Rg58 via BNC connectors to my 10M dipole. The lowest
piece of which is about 12' off of the ground. I set markers a L, M and H
points of the band.

S2 port had nothing connected.

The VNA was calibrated just prior to the sweep. An anchored via USB to my
Windows tablet.

Now I'm digging into how to read the Smith Chard and return / impedance
info...

Comments please!!

Do I need to update VNA firmware or make other changes. Software on the
tablet?

What's next folks?

--

*Dave - W?LEV*


--
Dave - W?LEV

Fresh out of box. A sweep of my DIY 10M antenna...

S1 - connected to 50' Rg58 via BNC connectors to my 10M dipole. The lowest piece of which is about 12' off of the ground. I set markers a L, M and H points of the band.

S2 port had nothing connected.

The VNA was calibrated just prior to the sweep. An anchored via USB to my Windows tablet.

Now I'm digging into how to read the Smith Chard and return / impedance info...

Comments please!!

Do I need to update VNA firmware or make other changes. Software on the tablet?

What's next folks?

I'm know looking at the connector. Some have a lever the needs to be moved to remove the cable.
I don't see one, is the just a push in pull out ribbon? i.e. no moving of any levers to get the cable out.
OK, I disconnected the battery, poked and prodded at the ribbon cable, reconnected the battery and tested it with the cover off.

After this it responds to the touch pad commands much better than before, it's not perfect but usable.
Now, after a little more use it is getting flaky to the touch again. Any logical reason for this?
Thanks, Mikek

Thanks to all

Finally , I found this response on this topic : /g/nanovna-users/message/26386

73's Nizar

Make certain that there is nothing touching the screen (masking film remnants, mounting hardware) and interfering with your touch, loosening/removing the screws may be helpful.
73, Don N2VGU

On Sat, Jan 11, 2025 at 4:19?PM va3rr via groups.io <va3rr=
[email protected]> wrote:

Nizar - I'm only a casual H4 user. You may wish to pose this question to
DiSlord, who is a prolific writer of H4 firmware. There may also be
answers in the wiki. /g/nanovna-users/wiki



vy 73 de Russ, va3rr

Nizar - I'm only a casual H4 user. You may wish to pose this question to DiSlord, who is a prolific writer of H4 firmware. There may also be answers in the wiki. /g/nanovna-users/wiki



vy 73 de Russ, va3rr

All,

We have reached our goal of raising another year's annual groups.io fee for this group. Thanks to everyone who contributed. I have to write that this was accomplished in less than 24 hours, which is remarkably fast.

*No more donations are needed.*

Thank you again.

DaveD

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Hi VA3RR
Thanks a lot for the help.
I conlude that MS5153 may be a little bit better to go up to 300Mhz lnstead of 290Mhz for SI5351A and also a little bit better for harmonics measurement with few db deeper, the jitter noise do not conserne our NanoVNA typical application , no matter how it is with both,
But wondering why firmware do not consider them as similare sheeps , what can be the changes with firmware ?
73s. Nizar

On Fri, Jan 10, 2025 at 05:06 PM, Dave Daniel wrote:

Friends and Family

Donated , thanks for the service

Maurizio IZ1MDJ

Donated, thanks for the service.

No, jog wheel does not move anything in the drop downs, but yesterday it did move the cursor horizontally.
I have tried to re-calibrate the touchscreen. Although, I'm not sure that helps with sensitivity.
Darn thing might be getting worse since yesterday, It may take 20 taps to get out of the Trace 0, 1, 2, drop down,
but then I'm in a loop with either Trace 0, Trace1, Trace 2, or Trace, Format, Scale, etc.
I'll pull the cover and try the connector.
Thanks for the input, Mikek

No, a firmware update probably will not help with this (but it would give you lots of other updates and features).
Can you get to the menu items properly using the jog wheel?
First try to re-calibrate the touchscreen - I don't remember how that is accessed in your version of firmware, perhaps under 'config -> touch cal', or maybe you have to do a factory reset, and then it is the first thing that comes up.
If that fails, you may have a hardware issue - maybe just need to re-seat the cable that goes from the main board to the touchscreen.
I hope this helps - good luck
Stan

I'm having great difficulty navigating between drop downs on my NanoVNA-H 4 edy555 design version 0.5.0.
First thing, I thought the first, 'about screen' disappeared after a short time, mine doesn't. If I tap the screen I get Display, marker,
stimulus, etc. I tapped or held and got trace. format, scale, etc. Then I tapped Format and got trace 0, 1, 2, etc. that's not correct.
Now tapping back only causes the grid to come and go with each tap. I did tap trace 0 and it did bring up the yellow Ch 0 in he upper left.
But back just keeps cycling the grid on and off. If I tap back enough it finally goes back to Trace, Format, Scale, etc. I can not get format to show.
It seems to know when the screen is tapped, but it doe not make the change as expected.
Would a firmware update help this?
Any thoughts?
Thanks, Mikek

Hi All
If it is really worth to replace the Chinese MS5351 by the Silicon SI5351a in my H4 SEESII Hardware 4.3_MS .

Thanks
73's Nizar

All,

It's that time of year again when we need to pay the annual $220 fee to keep the group going. The payment is due? the 18th and will be automatically paid by me.

Once again I ask that anyone who can contribute a few dollars is encouraged to do so. Here are the guidelines:

1. Every donation is appreciated by the group.

2. I will keep a log of all donations in chronological order. Assuming that the donation total reaches the $220 amount necessary, I will let the group know that we have enough to pay the fee.

3. Any donations that are made after the $220 goal has been reached will be returned. I do not have a good way to bank or track excess funds. Excess donations usually occur because of emails crossing in time, or me just getting busy.

4. All donations should be paid to me using PayPal "Friends and Family" (I am not making any money on this, obviously). My PayPal account is the same as my email address - kc0wjn at gmail dot com.

5. All donations will be kept in my (non-interest-bearing) PayPal account until I have paid the fee, after which time I will transfer the donated funds to my bank account.

6. In the past I have tried to personally acknowledge every individual contribution. I'll try to do that again this year, but I may not be able to for various reasons.

Thank you.
Dave Daniel, co-owner


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Thanks for the schematic.

// HIRO, JJ1FXF

Order new H4 or you can install slot as on new devices and use last firmware

Thanks for your reply, DiSlord-san.

My 2.8” NanoVNA-H is without microSD card slot.

Or any mod to add the one?

// HIRO, JJ1FXF