Hi Joe

You already got an answer from Eric, as the frequency must be 5.34GHz within 1KHz. However, the predefined harmonic offset is after a firmware update set to 10.5 and is not far away to what is created during the calibration above 5.34GHz, so is not essential except you want to measure above 5.35GHz with best possible accuracy.
It has no impact on measurements below 5.34GHz. For my two TinySA Ultra the harmonic offset is 9.1 for the unit (my master unit) I used for creating the correction table embedded in the latest firmware 1.4-40, and for the other unit 9.4 leading to an error of 1.4dB for the one with 9.1 and 1.1dB for the unit with 9.4. It also requires that the frequency adjustment is made to obtain the TinySA ULTRA can measure with said 1KHz accuracy.

However, there is a simple work around as if you enable ultra mode as choose center frequency 5.34GHz and span 100MHz. Then you apply a signal from a signal generator on one half or one third frequency, and tune the signal frequency so you see a signal 10MHz lower=5.33GHz and 10MHz higher 5.35GHz. The levels shall be equal on either side of 5.35GHz and if not the tune the leveloffset harmonic via a terminal command e.g. change the leveloffset harmonic from 10.5 to 10 as a start, and see if that was in the right direct for the level at 5.35GHz. The level at 5.33GHz does not change.
Keep the signal generator level low so you have about 20dB from noise floor to marker level above at 5.35GHz not to provide too high an input signal. ?Remember to issue the terminal command saveconfig when done and you are satisfied.
This procedure is not requiring to find the frequency correction figure, it just mean that the marker frequency is not 100% exact with respect to frequency.
I just updated both my units to firmware 1.4-40 and the master unit deviated +0.2dB between 5.33 and 5.35GHz and the other by +0.3dB so the leveloffset harmonic figure could be reduced from 9.1 to 8,9 and the other from 9.4 to 9.1.
But I will not do so because such small deviations are not relevant as what is 0.2dB amongst friend ?

Kind regards Kurt ???????

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Hi Erik.

How accurate must? the frequency? be?

I inject a 5.3420 (that's what my source steps manages) and abt.-20 dbm, and still get the 'Signal level too low or not on frequency'.


TIA??? Joe.