How does 'Segments',
Device Settings values:
Validation,
Data Points (11-1021),
and Bandwidth relate? How should these be used?


Also in Device Settings are listed:
NanoVNA-V2 v1.01
Features
Customizable data points
S21 hack
Multi datapoints

Hi John,

On 17.08.20 02:53, John via groups.io wrote:
> How does 'Segments',
> Device Settings values:
> Validation,
> Data Points (11-1021),
> and Bandwidth relate?

There is no relation between that settings.
And Bandwidth is still greyed out with V2.

> How should these be used?"
As you Like it"

Datapoints can be increased to get more points in one
sweep segment and therefore speed up data aquisition.

They can be decreased to get faster smaller part of
meassurement and this can even be useful if one
use exponential segmentation.

> Also in Device Settings are listed:
> NanoVNA-V2 v1.01

That's the firmware on the device

> Features
> Customizable data points
Yes, points per sweep can be modified and aren't fixed
to 101 or so.
> S21 hack
The first S21 measurement point of a sweep is way off
with current firmware, so that value will be discarded.
> Multi datapoints
A single datapoint can be acquired multiple times inside
of the device. A feature which is currently not used as
I don't know what the implication of this setting would be.
Perhaps it's meant to be the same as the bandwidth
implementation in V1 devices.

73
Holger, DG5DBH

I believe that the getting one point multiple times is to allow for data averaging - for noise reduction.

-Mark

Hi Mark,

On 17.08.20 13:03, MarkZ wrote:
> I believe that the getting one point multiple times is to allow for
> data averaging - for noise reduction.

it's my assumtion, too. But as NanoVNASaver has the ability to do
the same, it would possibly just gain some speed.

73
Holger, DG5DBH

Thank you Holger for that information.

So if I would like a very high resolution scan I can use Segments= 10,
Data points = 1000, and Scan Average 5,2 ?


John


On 8/17/2020 1:22 AM, Holger Müller wrote:

> Hi John,
>
> On 17.08.20 02:53, John via groups.io wrote:
>> How does 'Segments',
>> Device Settings values:
>> Validation,
>> Data Points (11-1021),
>> and Bandwidth relate?
> There is no relation between that settings.
> And Bandwidth is still greyed out with V2.
>
>> How should these be used?"
> As you Like it"
>
> Datapoints can be increased to get more points in one
> sweep segment and therefore speed up data aquisition.
>
> They can be decreased to get faster smaller part of
> meassurement and this can even be useful if one
> use exponential segmentation.
>
>> Also in Device Settings are listed:
>> NanoVNA-V2 v1.01
> That's the firmware on the device
>
>> Features
>> Customizable data points
> Yes, points per sweep can be modified and aren't fixed
> to 101 or so.
>> S21 hack
> The first S21 measurement point of a sweep is way off
> with current firmware, so that value will be discarded.
>> Multi datapoints
> A single datapoint can be acquired multiple times inside
> of the device. A feature which is currently not used as
> I don't know what the implication of this setting would be.
> Perhaps it's meant to be the same as the bandwidth
> implementation in V1 devices.
>
> 73
> Holger, DG5DBH
>
>
>

Holger,

And Validation? Are we turning parity and CRC on the serial port? Or--?

John


On 8/17/2020 1:22 AM, Holger Müller wrote:

> Hi John,
>
> On 17.08.20 02:53, John via groups.io wrote:
>> How does 'Segments',
>> Device Settings values:
>> Validation,
>> Data Points (11-1021),
>> and Bandwidth relate?
> There is no relation between that settings.
> And Bandwidth is still greyed out with V2.
>
>> How should these be used?"
> As you Like it"
>
> Datapoints can be increased to get more points in one
> sweep segment and therefore speed up data aquisition.
>
> They can be decreased to get faster smaller part of
> meassurement and this can even be useful if one
> use exponential segmentation.
>
>> Also in Device Settings are listed:
>> NanoVNA-V2 v1.01
> That's the firmware on the device
>
>> Features
>> Customizable data points
> Yes, points per sweep can be modified and aren't fixed
> to 101 or so.
>> S21 hack
> The first S21 measurement point of a sweep is way off
> with current firmware, so that value will be discarded.
>> Multi datapoints
> A single datapoint can be acquired multiple times inside
> of the device. A feature which is currently not used as
> I don't know what the implication of this setting would be.
> Perhaps it's meant to be the same as the bandwidth
> implementation in V1 devices.
>
> 73
> Holger, DG5DBH
>
>
>

So, the serial port emulation is a typical serial port with no parity or CRC. On the other hand, it is coming via the USB port which does use CRC checking on all packet data.

-Mark

Thank you Mark.

So I can guess that the 'Validate' option does not refer to serial data
transport.

John

On 8/17/2020 10:01 AM, MarkZ wrote:

> So, the serial port emulation is a typical serial port with no parity or CRC. On the other hand, it is coming via the USB port which does use CRC checking on all packet data.
>
> -Mark
>
>
>

Hi John,

The data validation seems to be a strange check on the incoming data to ensure it is not too big. I'm not sure it has a lot of value and it's from the original code so may have had more applicability to the original nanovna.

-Mark

Thank you Mark for that information.

John

On 8/20/2020 5:06 AM, MarkZ wrote:

> Hi John,
>
> The data validation seems to be a strange check on the incoming data to ensure it is not too big. I'm not sure it has a lot of value and it's from the original code so may have had more applicability to the original nanovna.
>
> -Mark
>
>
>