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Hello!
I have a problem. My tinySa ULTRA can not pass the calibration. It stops at the message - signal level incorrect, check the cable. But it always passes the self-test perfectly. I have read a lot of posts here in search of a solution to my problem.

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?In the end I replaced the LNA. But the result is the same as it was.

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?There is a suspicion on diode D5 on the calibration input. It rings in two directions and has a resistance of 63.5 ohms in two directions. Perhaps the reason is in it, but I can not see the labeling. What is the marking of this diode? And maybe I should replace diode D4 at once? Are they the same?

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I installed the latest firmware version, but the result is the same. Self-check - ok. Calibration - no.

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Please give advice or recommendations to solve this problem. Thanks!?

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Could be the input switch

You can trace the signal coming from the input through the switch.

If you lose 10dB through the switch it is broken

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Designer of the tinySA
For more info go to

Hello!?
Thanks for the advice, Yerik. I have no way to check the signal levels on that switch, so I decided to just replace it. This may not be the right approach to solve the problem, but I couldn't find any other option. Nevertheless, after replacing this switch Calibration started to run completely and without errors. The self-test is also ok. Levels are normal. Thanks again for your quick advice and help!?

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P.S. Let me explain what I replaced for those who encounter a similar problem:
The element on the board is U22. AS179-92LF.?
73! de UT2QL ?