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A first test will be to remove the switch and check if the signal level at the input jumps up to the level without any load. This will prove the ESD protection diode is not causing the problem -- For

OK, got this: https://ro.farnell.com/skyworks-solutions/as179-92lf/ic-switch-rf-spdt-0-02-3-0ghz/dp/1753762?st=AS179-92LF I hope I'm able to replace it and this is the source of the problem.

Yes. Its the input switch See the FAQ https://tinysa.org/wiki/pmwiki.php?n=Main.FAQ Scroll down to "tinySA ULTRA questions" -- For more info on the tinySA go to https://tinysa.org/wiki/

You are almost correct The switch is for the LNA but the signal path is bidirectional so if the switch is bad (e.g. creates 10dB loss) you will see this loss also when doing output -- For more info on

I'm playing around with the USB serial interface to simplify some pre-compliance tests. However, I can only get the live data out of the TinySA when the trace CALC is set to aver4 or quasi. The

I think (I may be wrong, as a beginner) that the switch is for IN/OUT. If that is the case, I can replicate the 10dB error by doing the reverse: generate a signal with the Ultra and read it on tinySA.

Is it the part market A79? What kind o chip is this?

Good morning, The 35db gain is needed when using the calibrator output of the TinySA as the reverence clock. The calibrator output is around -36dbm and needs to be boosted to a level acceptable for

I don't even know what the switch is. I do have a hot air station and basic skills (THT). Which part is the switch on the board?

This confirms the input switch has too low impedance. It is possible to replace the switch -- For more info on the tinySA go to https://tinysa.org/wiki/

TinySA @-7dB is ~780mVpp measured by the scope (high impedance, direct cable, 1X). Same is 300mVpp with a 50ohm BNC terminator. R44: ~80-90mVpp C98: ~75-85mVpp

If the input switch acts as a low impedance load the level measured at the input drops Please measure the output level of the tinySA when set to -7dB. This should be twice 280mVpp -- For more info on

It is 120mVpp at the entry point too, before anything else, so that is what the scope is measuring. I used that as a "reference".

My mistake Input level at -7 dBm should be 280mVpp Input switch seems broken -- For more info on the tinySA go to https://tinysa.org/wiki/

Also measure either side of R44, close to the mixer -- For more info on the tinySA go to https://tinysa.org/wiki/

The input switch seems ok Lift the large shield between the two sma connectors Set LEVEL/ATTENTION to zero With same input signal measure the level at either side of C98 -- For more info on the tinySA

Hello, thank you for the response. At 10MHz@-7dBm output from tinySA, I get the following data: - level indicated by Ultra: -17dBm - input pin ~120mVpp - C58 ~120mVpp - C24 ~100mVpp

Do you have a scope? If yes, can you input a 10MHz signal between -20dBm and 0dBm (such that it is well visible on your scope), you can use the tinySA to generate such a signal Remove carefully the

Hello, I've got a tinySA Ultra in December 2022 and all was good (tests & calibration at least). I also have a tinySA non-ultra. Yesterday while playing around, I've noticed that the signal level

John, Thanks for the idea for that inexpensive signal generator. I saw Tony Albus demo one last year, but thought it wouldn't be accurate enough. You'd mentioned getting rid of that 0 ohm resistor.