I experienced a similar problem, very slow using DfuSe, never completed the erase stage, after multiple aborted attempts I got the white screen.
Not content with doing that, I did the same thing to a second tinySA unit. The computer being used was a Dell Inspiron 3693 core i5 10th gen.
I spent a considerable amount of time trying the two USB 3.0 and single USB 2.0 ports with 2.0 and 3.0 cords to restore these units using
DfuSe 3.0.4 & 3.0.6 and none were successful. After a good amount of research I then downloaded STCube and tried that - it also failed.

Finally, in desperation I downloaded STCube onto my i3 Acer tablet that I use as a HTPC, it worked like a charm, upgraded to 1.1-32 very quickly.
Then I tried to read the units using STCube on the Dell i5 and was constantly greeted by the error message "flashloader cannot be loaded".
I then downloaded STCube to a Toshiba Satellite L755-S5344 i3 and it read both devices with no problems. The Acer & Toshiba have only USB2.0 .

In looking at STCube, the failure on the Dell is in the software being unable to determine the "device ID" and returning the term "unknown",
which in turn causes the failure to load the flashloader because it cannot load the 0x448 database profile for the STM32F072.
So this begs the question, why is STCube able to read the deviceID of the tinySA on the Acer & Toshiba computers but fails on the Dell,
even when using the USB2.0 port? I have tried purging the Dell of all ST programs and drivers and re-loading STCube multiple times but it still fails.

If anybody else has run into this issue and found the solution I would love to hear about it.

I thank both Herb and Erik for their prompt replies,

larry

Some more explanation:
The optimal value of the capacitors is a balance between the speed of the serial communication bus and the spurs the bus is creating.
The optimal capacitor values could only be decided after testing with a larger quantity of products by a broader set of users and this took some time as you can imagine.
Once the testing came to a conclusion we adapted the capacitors in production and I decided to publish the information on how buyers of the limited quantity early products could, if they felt the need, adapt their tinySA to have a bit? less spurs at the 48MHz harmonics.
If you are not bothered by the already fairly low level? of the 48MHz harmonics or find it difficult to add the tiny components I suggest not to add the capacitors as these harmonics can be easily recognized because they are on a 48MHz grid and have some FM modulation.

On Thu, Nov 26, 2020 at 03:15 AM, Lawrance A. Schneider wrote:

I have version H0.3 . ?But again, the terminals are there so why not populated? ?My 75 year old eyes and hands will be having a hard time. ?Plus, I have 0 (zero) SMD caps.

Larry,
? ?There are other pads on the board that are unpopulated also.? Designers usually add areas like that for future features or increased performance.? The tinySA meets its specifications without the caps and most users won't even be bothered by the 48MHz harmonics which are greater than -80dBm.? For those users who have a need for slightly greater noise performance the caps offer a way of achieving that.

?All currently manufactured tinySA's are version 0.3, in later production runs it looks like the caps were added based on the feedback of early users.? Sometimes being an early adopter has its disadvantages.

?- Herb

One of the feedbacks i have found on Banggood for the unit with display:

Fast delivery It did not exactly fit my needs and expectations. The analyzer needs at least a 30dB amplifier otherwise it is as deaf as a stone. It does not even indicate a a local FM radio station with an VHF antenna attached to it - unless an 30dB amplifier is in series with the antenna. I intended it to use on the IF exiting my FT1000D as a spectrum display but the bandwidth and resolution are not sufficient for such an application. The lowest span is 3Mhz and the lowest RBW is 5Khz /Kc. The?display is bright and clear and very good to read. It might be a good idea to buy an additional rechargeable lithium battery for it

Hello Herb,

> Hugen probably started installing the capacitors on later production runs at Erik's suggestion.

I have version H0.3 . ?But again, the terminals are there so why not populated? ?My 75 year old eyes and hands will be having a hard time. ?Plus, I have 0 (zero) SMD caps. ?I'll ask my friend Andy at the Uni if he has some. ?The problem is 'she who must be obeyed' will not allow me anywhere near the Uni. ?Last I heard, there were 47 cases there.

Thank you for your reply, ? ? ? ?larry ? ??

On Wed, Nov 25, 2020 at 03:37 PM, Lawrance A. Schneider wrote:

Hello Erik,

> Is there any downside to fitting these capacitors, bearing in mind that they were omitted > from the unit??

Why were C13, C17 and C20 not populated to begin with? ?The cost could not have been that much? ?There are no drawbacks for adding? ?I see you suggested 33pf whereas walker used 22pf; any reason for the difference??

Thank you for your time, ? ? ? ? ?larry

Larry,
? I happened to have 22pf smd capacitors in my capacitor kit but no 33pf's.? The 22pf's worked for me so any any value close to 33pf will probably work.? I think it was only after user's questioned Erik about the 48MHz spurs that he tried installing the 33pf capacitors and realized that they were useful.? hugen probably started installing the capacitors on later production runs at Erik's suggestion.

- Herb

Hi,

I made the same guess about those numbers. I am thinking those Chinese ladies have more practice than any of us:)

73,

Bill KU8H

bark less - wag more

Hello Erik,

> Is there any downside to fitting these capacitors, bearing in mind that they were omitted > from the unit??

Why were C13, C17 and C20 not populated to begin with? ?The cost could not have been that much? ?There are no drawbacks for adding? ?I see you suggested 33pf whereas walker used 22pf; any reason for the difference??

Thank you for your time, ? ? ? ? ?larry

开云体育

I'm guessing that the serial number is the date plus a number. 200912xx would be 12 Sept 20, 201004xx would be 4 Oct 20 etc. Only Erik can confirm. I found that replacing the unit back in the case was a bit of a fiddle but OK in the end. Perhaps the Chinese ladies who do the assembly have more nimble fingers than mine.

--

On Wed, Nov 25, 2020 at 10:05 AM, geoff M0ORE wrote:

I checked my tinySa this afternoon after getting some 33pF caps from spares box and the caps were already fitted. H/W V0.3, serial number 20100409. Not checked value so I can only assume they are 33 puffs.

I wonder what the hardware rev # or serial number? was when they started installing these caps?

Roger

开云体育

I checked my tinySa this afternoon after getting some 33pF caps from spares box and the caps were already fitted. H/W V0.3, serial number 20100409. Not checked value so I can only assume they are 33 puffs.

No
--

Hi Eric

Is there any downside to fitting these capacitors, bearing in mind that they were omitted from the unit??

Regards
Jeff

I have written a documentation for this specrum analyzer board:


73, Rudi DL5FA

@Scott

i just downloaded without any problem.
Nevertheless, i put it on my server:

http://www.siglishofen.de/Scott.rar

Banggood has two small 4.4GHz SA with screen at $69 and $89. It rather looks like their firmware has been adapted/rpped-off from the TinySA Github. I have ordered one of each and will report when they arrive from China (expected around Christmas).

On Wed, Nov 25, 2020 at 06:16 AM, Massimo Martini wrote:

Thank you for the screenshots Herb.

Can i use the nanoVNa signal generator attached directly to the tinySA input without attanuator?

? ? If the tinySA is in its normal auto settings mode, then it should adjust its internal attenuation automatically to prevent the output of the NanoVNA from over driving its input.? In manual mode, I would suggest setting the internal attenuation to 20dB.? No external attenuation is necessary.

? ?Beware that the above applies to the LOW INPUT.? The HIGH INPUT does not have the input attenuation and filtering that the LOW INPUT does so a external 20dB attenuator would be a wise choice when the NanoVNA is connected to it.? Without the attenuator the tinySA will not be harmed by the NanoVNA but a lot of spurious signals may be produced.

? - Herb?

? ?- Herb