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Hello Sven,

/g/tinysa/message/2180
If you have the capability I suggest to solder 33pF 0603 SMD capacitors on the open positions C13, C17 and C20. This will reduce the currently visible 48MHz harmonic spurs to almost zero.
?
/g/tinysa/message/2184
Picture of PCB with C13 and C17:
https://s3-us-west-1.amazonaws.com/groupsioattachments/71803/76579859/1443/0?AWSAccessKeyId=AKIAJECNKOVMCCU3ATNQ&Expires=1613641899&Signature=JHjBM1qE44F%2FCH9hmN65HRTRiT4%3D&response-content-disposition=inline%3B+filename%3D%22C.JPG%22
?
I have used SMD size 0805.
?
73, Rudi DL5FA

The topic is "Is my tinySA genuine". Nearly 33pF or 0201 smd with much solder , I did it.

/g/tinysa/message/2180

Hello Rudi,

please can you show me where I can find the instructions to solder the three capacitors.

Thanks.

Sven Hegewisch

Rick,
You could try an ST-Link (if you have one)
Open the tinySA case,?
Solder a 3 pin header to GND, SWCLK and SWIO and connect these to an ST-Link and use the STLink and CubeProgrammer to update the SW

--

Self test OK.



On Wed, 17 Feb 2021 08:22:36 -0800
"Erik Kaashoek" <erik@...> wrote:

One user reported a small selftest failure starting after upgrading to v1.1-88
This failure can not be caused by the upgrade to v1.1-88 but the coincidence is a bit worrying.

All that upgrade to v1.1-88, please be sure to run the selftest before and after the upgrade and report any differences in the selftest you notice after the upgrade to v1.1-88

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For more info on the tinySA go to

SN 20070285

03.297 rx: 12: 95.266M
03.549 rx: 13: 94.934M
03.797 rx: 14: 95.294M
04.052 rx: 15: 95.681M
04.297 rx: 16: 96.069M
04.610 rx: 17: 96.429M
04.859 rx: 18: 96.816M
05.109 rx: 19: 97.204M
05.358 rx: 20: 97.564M

On Wed, 17 Feb 2021 06:05:24 -0800
"Erik Kaashoek" <erik@...> wrote:

New FW release
Version v1.1-88

Changes:
- The spurs caused by the 48MHz MCU clock have been reduced.
- The scanraw command progress is displayed using the green progress bar.

tinySA-App uses the scanraw command and with a large number of points and a low RBW it often is not obvious if the tinySA is still? scanning or how long? it would take till the end of the scan. The green progress bar give better insight in scanraw progress.

The mechanism used to reduce the MCU spurs makes some assumptions which I would like to see verified by some users.
Can some of you test this using the console command:
selftest 6
In reply you get a list of frequencies.
I'm interested in the frequencies listed after 12 to 20
This is what I get.
12:? ?94.602M
13:? ?94.989M
14:? ?95.377M
15:? ?95.764M
16:? ?96.069M
17:? ?96.456M
18:? ?96.844M
19:? ?97.231M
20:? ?97.536M

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For more info on the tinySA go to

Thats the first one I tried. It runs like everything is fine, but come up with an error at the end.
11:55:59 : Error: failed to download Segment[0]
11:55:59 : Error: failed to download the File

Hello Eric,
After some measures it looks very good:
Firmware v1.1-88
RBW 10 kHz
33pF capacitors soldered
Input LOW shorted
USB cabel connected

Just the local FM Radio station on 105.845 MHz is visible.

73, Rudi DL5FA

On Wed, Feb 17, 2021 at 09:27 PM, Erik Kaashoek wrote:

Please notice the RBW I used in my screen grabs

Thank you Eric,
now with RBW 10 kHz, no longer so good.

73, Rudi DL5FA

Hello,
where is the topic? 33pF capacitors modification description? I want to try to improve the spurious.

No idea. Suggest you contact your supplier

Well after 3 different computers, 5 different USB ports and 3 different USB cables, no luck.? Anything else to try?

Rick W7RMS

Please notice the RBW I used in my screen grabs
--

The cal output is hard coupled to the TCXO. The correction factor is used only for the low and high input frequency calculations

On Wed, Feb 17, 2021 at 10:34 AM, Erik Kaashoek wrote:

The TCXO runs on 30MHz and the lower cal output frequencies are created using a divider instead of a PLL
The cal output is like to 10MHz reference clock of other spectrum analyzers.
If the cal output is offset you can correct it using the CONFIG/EXPERT CONFIG/MORE/CORRECT FREQUENCY where you can enter the actual frequency of the 10MHz cal output
--

?

Erik,

I measure my 30 MHz. cal output and it was 45 Hertz off.? So I measured the 10 MHz. cal output and it was 15 Hz. off.? I went to CONFIG/EXPERT CONFIG/MORE/CORRECT FREQUENCY and entered 9999.985 K and did not notice any difference in the 10 MHz. cal output.? So I thought maybe this is just a divide by 3 of the TCXO and this offset adjustment does not have an effect.? So I went to the Low Output mode and? set it to 10 MHz. and i was still 15 Hz. off.

Could you please provide further details on how to use this feature or point me to a video that explains proper procedure.?

Regards - Roger