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For those that don't have access to a 3D printer, the ~$20 Pelican 1020 case is perfect for the TinySA, NanoVNA or SARK110. I simply folded a paper sleeve to protect the screen, and all the accessories fit nicely around it. Well padded too.

I'd like to note that *any* filter shape desired is easily produced in the least squared error sense by a Wiener inverse filter of length N. Every FFT based SA I've looked at has had a "most wanted" list including some of the worst filter shapes possible. But none of the good ones such as gaussian, sech and a few others. which are symmetric and have negligible sidelobes.

In any case, after careful reflection I've concluded, "What would you like?" Post processing can provide major improvements and any desired filter shape can be produced. It's a little strange doing what I would usually do in a time domain setting in the frequency domain. But it really doesn't change anything.

If you ship the data to a tablet for processing you can do anything you want, so long as it doesn't violate the laws of physics. The compute cost is negligible.

If the data is buffered you can run a raw waterfall and overlay it with the enhanced waterfall when it has been computed. In point of fact, the user would probably never notice the latency.

My estimate from looking at the overall system performance is that you could get another 20-40 dB of dynamic range by post processing the data prior to display.

Within the context of the current hardware, 1 Hz RBW is easily achievable in an externally hosted program. But beware, each frequency will require over 1 second to acquire. TANSTAFL

Have Fun!
Reg

Will do - thanks!

I will likely add the smaller case to Thingiverse at some point soon.? Maybe I will shrink the hinge knuckles to work with a shorter fastener (30mm is probably a more common length than 40), but I have a pretty wide assortment here, and the 40 seemed like it would be more robust for the wider original case design.

I honestly don't know what I am going to use the tinySA for other than occasional tinkering (I'm a mechanical engineer who dabbles in electronics in my day job, and a hobbyist level electronics enthusiast).? I don't do much with RF or analog stuff personally.

The NanoVNA comes in several models. The first was sort of an open PCB.
The NanoVNA-H has a plastic case, and was the template for the TinySA (same hardware inside too).
There are later NanoVNA models like -H4 (larger screen) -F (different hardware) and V2 (goes to 3 GHz).
If you are considering getting a NanoVNA, join?[email protected]?for manuals, tutorials etc.
You can use it to characterize antennas, measure filters and amplifiers, and all kinds of passive components.
Compared to a professional VNA (easily costs $20 000) it is a steal at $60 - 120.
If you post the smaller case on Thingiverse, mention it as a NanoVNA-H case as well as TinySA.

Looks good!? I didn't realize that NanoVNA was physically identical to the tinySA - I swear I saw images of that before that were more of an "open" PCB design with no case/housing.

If you really wanted to adjust the design for 30mm screws, you might be able to create cuts in your slicer, removing 2.5mm from each of the hinge knuckles where the screw head and nut rest.? You might even be able to sand/trim off that 2.5mm from those surfaces too, but it might expose infill.

Works nicely, Thanks!
It took me 4.5 hours to print the bottom part and 3 hours for the lid (with room for foam).
Printed with supports only under the hinges, not inside, but I didn't manage to remove all supports yet on the bottom part.
FlashForge Finder with black PLA. However, I was unable to get M3x40, had to do with M3x30,
but it is ok my hinge holes can hold the screw without the nut since they came out slightly tight.
No foam in the case yet, but it looks like a attenuator and DC-block can ride along.
The NanoVNA-H is standing on the side, waiting for its case to be printed tomorrow.

It would cost some arithmetic, but it shouldn't be hard to run a 8-12 point filter and significantly improve the shape. For low computational cost I like triangular weightings. The multiplies can be done by bit shifts and the resulting filter shape is dominated by sinc**2.

Big question is how many multiply-add operations can one do per sweep point before reducing the sidelobes takes longer than the reduction in sweep time.

Sound like an Octave exercise.

Have Fun!
Reg

On Tue, Aug 3, 2021 at 02:40 PM, Ham Radio wrote:

Just repaired a Sansung Plasma monitor. ?The Sansung designers went to great lengths to provide proper shielding for the HV supply and used ?RF chokes on the control leads.

One of the main problems with Plasma TV's, tends to be the Plasma itself, which is basically an electric arc contained in a gas, and if the screen is of a decent size, it can radiate significantly.

LED TV's are a lot better in this respect, and personally, if presented with a Plasma TV to fix, I'd probably suggest that it was more 'economical' to replace it with a new LED TV instead.

Regards,

Martin

Just repaired a Sansung Plasma monitor. ?The Sansung designers went to great lengths to provide proper shielding for the HV supply and used ?RF chokes on the control leads. ?If someone, ?who has repaired the monitor, ?did not put *all* the shields back on properly, that device will certainly be a great source of RFI. ?

Many repair tech has no clue regarding RFI suppression …
--
73, Bernie, VE3FWF
(most typos in this message were generated by highly sophisticated auto-correction software)

Forgot to mention the dimensions:
123mm wide, 81.13mm deep (including 9.13mm for hinge knuckles), 27mm high.

OK - here is my take on the "minimal" tinySA case - sized to only accept the tinySA with no accessories (but I think the guitar pick should fit in the space between the sma connectors).? As before, I am just uploading the files here for those who may want to print it, prior to creating another "thing" on thingiverse.? If anyone does print it, PLEASE provide feedback and confirm fit.??

As before, there are two versions which share a common lower case.? The upper case changes depending on whether you have the correct foam pieces to use in the upper case (roughly 3.25mm/1/8" thick neoprene).
If you DON'T have the foam, print the 'nofoam' upper case.
If you DO have the foam, print the 'foam' upper case.

All previous comments in this thread (and the original Thingiverse page for post printing still apply), and the hardware is still the same (M3 x 40mm SHCS x 2, M3 nylon locknut x 2, M3 washer x 4).

Thanks

OK - I will shrink it down to the minimum.? No place for the guitar pick "stylus" either?? I might have a natural place for that between the SMA connectors - we shall see...

Correct, no test leads, no antenna, no accessories, except the mounted SMA Savers.
Once they are on with the correct momentum I don't want to remove them,
but I want to protect the TinySA (NanoVNA) in a box.
This could make the box as small as 7 x 11.5 cm or so, and printable on 14x14 printers.
Thanks!

So just to be clear - are you looking for something that would just hold the tinySA and those attached connector savers?? No place for antenna or connector cables?

Also - to respond to Lawrance - if you are referring to the "narrow" case option, that was just a "hack" to see if I could squeeze a case onto a smaller print bed.? It sounds like the original commenter had something different in mind (hence my questions for confirmation on the size he is looking for).

Thanks

A common SMA-saver is?SMA5071A1-3GT50G-50 from Amphenol
Mounted on the case it will extend 18 mm from the plastic, 19 mm with the yellow plastic cap
(as opposed to 6 mm and 7 mm respectively in normal cases)
I have a NanoVNA 2.8" screen, in plastic case, which was the model used as template for the TinySA,
so all measurements, buttons and connectors are identical. I double checked as I did the measurements.

?

Are you sure you want the test leads that tightly bent?

Larry

If you can provide/confirm the lengths of the SMA savers (measured from the edge of the tinySA case, I could probably model something up (not as quick as the last one).? I don't have the nanoVNA, so I would have to take your word that it would fit.

I would prefer a smaller version that just has room for the TinySA with SMA-savers.
A case like this would also work for my NanoVNA.
Cables, attenuators, calibrations sets and more converters I keep in a different box anyway.
Thanks!

For those that use MATLAB a MATLAB wrapper for acquiring data from the tinySA?



Creator: Jegan Mani (2021).?tinySA MATLAB Wrapper?(https://www.mathworks.com/matlabcentral/fileexchange/96882-tinysa-matlab-wrapper), MATLAB Central File Exchange. Retrieved?August 1, 2021.

Thank you very much!

Chris