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Indeed, the display test failed also. This indicates bad communication over the SPI bus.

Can you open the case and try to reseat the LCD cable? Maybe that will solve the problem

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Designer of the tinySA
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Thank you. Are the attenuators specific to your design of tinySA or are they are standard fitting device available from various outlets?

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One other point; what feature of a single loop (of 2mm tinned copper wire) determines its optimum detection frequency and is there an optimum diameter or configuration for my frequency range (e.g. square vs circular)?

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Julian

It looks like the MCU can't read data through the SPI interface. if it still doesn't work after removing the SD card, the MUC's SPI port may be faulty. the SD card, LCD, and RF chip are all mounted on the same SPI bus. Maybe the SPI bus was damaged when the SD card was inserted or removed.

When you are probing with a loop antenna you can start at large distance (two meters) and reduce the distance if there are no strong signals.

Unless you are exiting the coil with a LOT of power, then you may have to start at larger distance.

To be absolutely sure, you can put a 20 or 30 dB attenuator directly on the RF connector of the tinySA and connect the antenna to the attenuator.

Make sure you never ever touch anything with the telescopic antenna.

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Designer of the tinySA
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On Fri, Apr 4, 2025 at 03:57 AM, Kerrowman wrote:

I know the tinySA is not accurate below 100kHz but I have heard that by making some Config adjustments then it will detect them.

The tinySA Basic (0.3.1 model) will actually work well down to 10 kHz but you lose some dynamic range

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Designer of the tinySA
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What about the issue of potentially damaging the SA? How can I work out the dB of the fields surrounding the coils to best protect it? I do have one of those cheap field meters for elec and mag fields, which measures in V/m and ?T.

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Julian Perry

:)

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Julian Perry

Yes, an important question. 10kHz - 20MHz I think is reasonable. I know the tinySA is not accurate below 100kHz but I have heard that by making some Config adjustments then it will detect them.

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Julian Perry

What frequencies are you targeting?

The supplied antenna is good for 50 MHz and higher but is a lot less sensitive for 10 MHz and lower

For low frequencies you better use a (home made) loop antenna

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Designer of the tinySA
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Hi all,

I’m new to this group, a physicist by background but also new to using a spectrum analyser. Before I go and actually buy the Aursinc V0.3.1 model, I wanted to ask about how I might go about making measurements relevant to my research so I can be sure this is the best and most affordable approach.

To summarise, I am investigating resonance in coils driven at radio frequencies and high voltages and looking at the standing waves that result from certain coil configurations and wire lengths. To make it easier to show what I’m doing, I attach some graphics showing the circuit (without an output load), a typical coil configuration and an example of standing waves that show on a scope using a low-powered setup of 18V to the primary coil.

In particular, the queries I have are:

• Can I detect what frequencies are emanating from the coils by using the supplied aerial placed within say 50cm of the coils?
• What sort of attenuator would I need to cope with the high voltages and power in the secondary in particular?
• Are there any others known about how are doing this type of measurements?
• Will the tinySA-App work with Windows 10?

Thank you in advance for any help.

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Julian Perry

Basically I want to save continuous traces as fast as the TinySA ultra allows until the SD card is filled. With the autosave function the fastest it goes is 1 save every 30 seconds. When I manually press trace to SD I can create a new save about every 3 seconds. My scan time for the desired data is 270 ms.? What settings can be used to make the autosave function run as fast as possible? I am not worried about using up the entire SD card rather quickly. I actually expect this.??

Best to you and thanks,

James

Hi.

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The fastest I have been able to get it to save is in 30 second intervals. Is faster possible? Would this require going into the internals settings? I can manually press save twice faster than 30 seconds, so I know the system has the capability to save data faster than 30 second intervals. Thank you for your response.?

Critical is not failing, just a warning some test is on the edge

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If you still worry, follow the fault finding as described on this page.

to get your confidence back

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Designer of the tinySA
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Heb de TinySA ultra nog niet heel lang. Maar zie dat de zelftest faalt

Zelftest 3 geeft signal level critical

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Ook met het vervangen van de kabel.

Ik ga er eerst maar vanuit dat ik iets verkeerd doe.

Iemand advies of heb ik zo heel snel iets opgeblazen?

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Johan

0.5 s is too quick, slower is possible

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Designer of the tinySA
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With nothing connected to the inputs and all default settings (after clear config)? the screen should look in a certain way.

It should be like the first picture on this wiki page

If this is different than please post a photo where I can read the dBm scale numbers as they were very weird

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Designer of the tinySA
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