开云体育

The testers have been asking for some extra functionality and it was still possible to fit it into the available space.
Here you see two functions in one picture.

One tinySA is used as signal generator and does a power sweep from -10 to -60dBm in a sweep time set to 6 seconds. Level sweep can ramp up or ramp down.
The second tinySA is set to zero span and a trigger level of -12dBm and also with a saweep time set to 6 seconds. There is still a bit of switching noise in the ramp.

A small status update. Progress is good. The performance measurements by the testers is confirming the specification and the user interface has been updated based on user feedback.
Preparations for a small first pilot run to confirm manufacturability are starting.
We will keep you informed.

Measuring the 1dB compression point is a lot of work as you manually have to step through many signal levels to find the level where the detected signal is 1dB below the expected level.
Using the internal step attenuator and the LINEARITY measurement in the MEASURE menu most of the manual step are automated.
The green line in the picture below shows 9 measurements shown for each 1 dB step starting at 29dB attenuation.

Using an external signal generator at any of the supported low input frequencies at a level above the expected compression point level (such as?+10dBm) will allow a quick measurement of the linearity.
As the green line shows little disturbances below where the compression starts it is safe to conclude the internal step attenuator is very linear.

Next to the performance of the first LO and the first mixer, the performance of the various resolution filters does have a huge impact on the performance of a spectrum analyzer. To provide some understanding of what the tinySA resolution filters can (not) do I added a page to the wiki:

One of the beta testers did a very good job at measuring the power linearity of an uncalibrated tinySA.
Uncalibrated implies the absolute level may be a couple of dB off but the relative steps should be accurate

First the low input



And the high input



From these measurements that are a couple of conclusions.

The 1dBc of the low input is possibly at or a bit above 0dBm
The 1dBc of the high input is expected to be close to -10dBm
The low input LPF is at -3dB around 300MHz and at -6dB at 350MHz. This will have to be compensated for.
Below 1MHz the low input is having some problems. These possibly can be corrected by adjusting AGC and LNA
Below 0.4MHz the phase noise limits the low end of the power measurement range
The high input is flat +/- 1.5dB over the whole range
The power level measurement is close to the official +/- 1dB overall linearity.

Overall this measurement confirms the spec on the wiki.

I write all info about in NanoVNA group in my firmware topic
/g/nanovna-users/topic/nanovna_firmvare_compiled_by/73181877

For transfer data need eject SD card from slot and put in PC card reader, screenshots stored in standart Windows *.bmp file format vs 16bpp color.

If not use FatFS lib for support Fat32 filesystem, possible save and load data by sectors 512 byte size (can be useful for stand alone use) or use more simple filesystems. If need just read (and write vs some limitations), possible use very compact PetitFS lib, it need just ~2kB flash and very fast

PS Sorry for my typo, not SC, it SD card

On Fri, May 22, 2020 at 09:52 AM, DiSlord wrote:

At this moment i implement SC Card support for NanoVNA H4, it very simple and good work. Use SPI interface some as display, need only SD_CS,?SPI_MOSI,?SPI_SCLK signals (SPI shared vs display and work on some speed), good if exist SD_CD (for SD card insert);

It very low cost solution, need ~7kB flash and ~600 bytes RAM for full dile read/write Fat16/32 support (can extend, use FatFS lib)

Dislord,
? ?Will your SC Card support also include transferring stored traces to a PC?? What formats do you anticipate being a to store to the SC Card?

- Herb

Will be a good solution for a future 4" version of the tinySA. In the 2.8" version there is not enough spare space at the edge of the PCB to place the SD cardslot

On Thu, May 7, 2020 at 01:41 AM, <erik@...> wrote:

As the internal flash can endure above 10k write cycles I assume using the internal flash with a warning not to store too often is OK.

Saving settings to one of the internal memory slots now also saves the stored trace and loading a saved setting will restore the stored trace.

This provides 4 memory slots to save traces?

At this moment i implement SC Card support for NanoVNA H4, it very simple and good work. Use SPI interface some as display, need only SD_CS,?SPI_MOSI,?SPI_SCLK signals (SPI shared vs display and work on some speed), good if exist SD_CD (for SD card insert);

It very low cost solution, need ~7kB flash and ~600 bytes RAM for full dile read/write Fat16/32 support (can extend, use FatFS lib)

And some practical?examples
First DECT traffic just below 1.9GHz and second WiFi traffic around 2.45GHz. Red line is current signal, yellow line is power envellop

Having full control over the internals of the tinySA allowed some experiments at higher input frequencies using the mixer and BPF in a creative way. This of course required the elimination of the low input low pass filter.
Here you have a short set of screen captures that demonstrates a slightly modified tinySA is able to measure higher input frequencies with some limitations as at least the power level is not reliable. Once solved, this has promise to? become a "tinySA special", or an opportunity for hackers
The input is an ADF4351 set to 2.3GHz, 2.4GHz, 2.5GHz and 2.6GHz. TinySa settings are identical in all 4 measurements.

I will adapt the wiki to show the status of the availability of the HW

Thank you all that responded. I only wanted to be sure that the hardware was available or still not. Since I read a lot of messages in the group I was not sure if I had missed the launching announcement.

Thank you again.

Best regards,

Ignacio EB4APL

--
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.

I have been in product development of high volume electronics (millions of products sold all over the world) and experienced a major post launch problem forcing a global recall. Launching too early is still one of my worst nightmares.


?

On Wed, May 20, 2020 at 03:11 AM, EB4APL wrote:

Is it possible to purchase a TinySA now?

The usual response to questions like that regarding products still in development is:? "It'll be ready when it's ready."

Shipping times are terrible and not all beta testers have received the HW yet. Once they have access we have to wait for their feedback.

Is it possible to purchase a TinySA now?. I realize that it could be
preliminary versions, but I think that all traffic in the group is too
much for a very reduced group of beta testers.

Regards,

Ignacio EB4APL


--
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.

Been there, done that