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I think I have one of the original NanoVNA's because I can't do the TDR option with mine and I have tried to do firmware updates to it and that feature still won't appear. Is it just selected few models of the NanoVNA that do the TDR option or can all of them do it? I am just wondering before I go and buy another one so that I have that feature. I have no idea what version I have because everytime I turn it on the screen goes so fast I can't see what the version is.

Hi N7WFK,

Try taking a video of the screen using your cell phone at turn on time. Then you can go back to the still frame that captured the screen with the version info.

John,
WA3JRS

That is what I did.

*Marshall Harrison, *
*Microsoft rMVP
<>*
*904.655.6502*





On Thu, Jun 24, 2021 at 9:45 PM John Stewart, wa3jrs via groups.io <rs18041=
[email protected]> wrote:

Hi N7WFK,

Try taking a video of the screen using your cell phone at turn on time.
Then you can go back to the still frame that captured the screen with the
version info.

John,
WA3JRS

On Jun 24, 2021, at 9:09 PM, Richard -- N7WFK <rdykstra82@...>

wrote:

?I think I have one of the original NanoVNA's because I can't do the TDR

option with mine and I have tried to do firmware updates to it and that
feature still won't appear. Is it just selected few models of the NanoVNA
that do the TDR option or can all of them do it? I am just wondering before
I go and buy another one so that I have that feature. I have no idea what
version I have because everytime I turn it on the screen goes so fast I
can't see what the version is.

Richard,
All the original nanovna, h and h4 units will do TDR.?
How are you trying to flash new FW?? Are you using the defuse utility? If yes, get my modified exe file from the forum's file area and install that as the meanings of the buttons are more understandable.?
Also, throw away the flash ROM you have and redownload a new copy as you've most likely dumped your flash instead of updating it.?
... Larry


On Thu., 24 Jun. 2021 at 9:09 p.m., Richard -- N7WFK<rdykstra82@...> wrote: I think I have one of the original NanoVNA's because I can't do the TDR option with mine and I have tried to do firmware updates to it and that feature still won't appear. Is it just selected few models of the NanoVNA that do the TDR option or can all of them do it? I am just wondering before I go and buy another one so that I have that feature. I have no idea what version I have because everytime I turn it on the screen goes so fast I can't see what the version is.

Hello Richard!
FW Version of NanoVNA can You see so:
CONFIG-->VERSION

73 de Vladimir, dl7pga