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I think many of us would really like having built-in TDR functionality for simple antenna & feedline testing.?? Considering how inexpensive the nanoVNA is I, for one, would not mind having one with the current VNA capability and one with SWR (or return loss) and TDR. Is that a coding possibility?

?Wayne Maynard <wb6bfn@...>?

That is a very nice Idea, I would buy a second one for such work.

There is also the path of going to a raspberry Pi that could drive a
screen and just grab the raw data for the calculation In fact a new
NanoVNA model could me a kind if shield tha plugs on top a raspberry
pi??

I've not had time to start working on the code yet. Ultimately I'm more interested in switching to the STM32F303CCT6 with 3x RAM and 2x flash.

However, I plan to look into configuring the STM32F072CBT6 version as TDR and SWR only. A dedicated unit would be great to have in a field day kit.

If one got rid of the existing LCD screen and UI code it could be run from a Pi over the serial port. Very likely that would provide enough additional space. But the 303 part is still by far the best option. Especially if hugen or other sellers will offer that as an option in place of the 072 part.

The nanoVNA has thrown a major wrench into my activities. A *very* welcome wrench, but there is only so much time in the day. I still need to create and document test cases for the frequency to time transform. I've worked out what they should be, but not had time to create the test inputs. And i still have some questions about the best way to implement time gating.

Have Fun!
Reg

On Thu, Sep 5, 2019 at 10:08 PM, Reginald Beardsley wrote:

I've not had time to start working on the code yet. Ultimately I'm more
interested in switching to the STM32F303CCT6 with 3x RAM and 2x flash.

However, I plan to look into configuring the STM32F072CBT6 version as TDR and
SWR only. A dedicated unit would be great to have in a field day kit.

If one got rid of the existing LCD screen and UI code it could be run from a
Pi over the serial port. Very likely that would provide enough additional
space. But the 303 part is still by far the best option. Especially if hugen
or other sellers will offer that as an option in place of the 072 part.

The nanoVNA has thrown a major wrench into my activities. A *very* welcome
wrench, but there is only so much time in the day. I still need to create
and document test cases for the frequency to time transform. I've worked out
what they should be, but not had time to create the test inputs. And i still
have some questions about the best way to implement time gating.

Have Fun!
Reg

If you need it, I can provide a test PCB that includes the stm32F303CCT6 MCU and a 3.5-inch LCD.

hugen

hugen,

I sent a private reply asking to get the regular nanoVNA with a '303 part substituted for the '072 part but never received a reply.

For the moment I don't care about the screen size. I just need a development system.

As others are likely to want one, just tell us how to buy one.

Thanks,
Reg