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After upgrading to 0.8 firmware, SWR measurements seem off #firmware

 

I have one of the original type NanoVNA. The connectors are on the end, not the side. Anyway, I upgraded the firmware several months ago to the 0.8 version. Ever since then the SWR measurements always read high. For example, I am getting a measurement of 4:1 on a vertical antenna in VHF range, but my Bird meter shows a 2:1 for the same antenna. I have tried calibrating multiple times. Any ideas?
 

Ground is connected?

On Tue, 2 Mar 2021 at 19:43, Matt Trull <Oxyacetylene@...> wrote:

I have one of the original type NanoVNA. The connectors are on the end,
not the side. Anyway, I upgraded the firmware several months ago to the 0.8
version. Ever since then the SWR measurements always read high. For
example, I am getting a measurement of 4:1 on a vertical antenna in VHF
range, but my Bird meter shows a 2:1 for the same antenna. I have tried
calibrating multiple times. Any ideas?
 

The coax braid/ground is connected. I should elaborate that I see higher
than normal readings when testing many different antennas. I just tried
flashing back to the 0.7 firmware and get the same results. If I use a 50
ohm dummy load I see a 1:1 SWR, so that is working as expected.

On Tue, Mar 2, 2021 at 2:44 PM Dragan Milivojevic <d.milivojevic@...>
wrote:

Ground is connected?

On Tue, 2 Mar 2021 at 19:43, Matt Trull <Oxyacetylene@...> wrote:

I have one of the original type NanoVNA. The connectors are on the end,
not the side. Anyway, I upgraded the firmware several months ago to the
0.8
version. Ever since then the SWR measurements always read high. For
example, I am getting a measurement of 4:1 on a vertical antenna in VHF
range, but my Bird meter shows a 2:1 for the same antenna. I have tried
calibrating multiple times. Any ideas?
 

Hi Matt,
After a firmware upgrade, all previous data must be deleted from the device storage to prevent it from being used.
Therefore, after updating the firmware, use the 'clearconfig 1234' command under a terminal program.
You must then perform touchscreen calibration as needed and calibration according to the frequency ranges used.
The current latest firmware is of DiSlord v1.0.46 or a larger font version of Hugen v1.0.45.
If you also want to use a computer display, change the firmware for this. NanoVNA-App v1.1.206 created by OneOfEleven only works correctly with newer versions. (The changes were made together in the firmware and PC software).

73, Gyula HA3HZ
--
*** If you are not part of the solution, then you are the problem. ( ) ***
 

Thanks Gyula! I updated the firmware and cleared the config as you
described. That may have been the ticket, but too early to tell just yet. I
also have two new firmware to experiment with! Using the large font Hugen
version right now. I will do some more testing over the next few days and
report back.

Thanks,
Matt

On Wed, Mar 3, 2021 at 3:37 AM Gyula Molnar <gyula.ha3hz@...> wrote:

Hi Matt,
After a firmware upgrade, all previous data must be deleted from the
device storage to prevent it from being used.
Therefore, after updating the firmware, use the 'clearconfig 1234' command
under a terminal program.
You must then perform touchscreen calibration as needed and calibration
according to the frequency ranges used.
The current latest firmware is of DiSlord v1.0.46 or a larger font version
of Hugen v1.0.45.
If you also want to use a computer display, change the firmware for this.
NanoVNA-App v1.1.206 created by OneOfEleven only works correctly with newer
versions. (The changes were made together in the firmware and PC software).

73, Gyula HA3HZ
--
*** If you are not part of the solution, then you are the problem. (
) ***

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