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I own two TinySA Ultra devices. I am attempting to measure the output level of a frequency synthesizer and it appears that one of the TinySA Ultras is giving incorrect levels. As an example, this morning I measured the output of the synthesizer at 1246 MHz on each of the TinySA Ultras. One device showed a level of -6.2 dBm and the other showed a level of +3.2 dBm. The +3.2 dBm value is close to the synthesizer's specifications. I did a level calibration and a self test on each TinySA Ultra just prior to making the measurements. The same cable was used for both measurements and I have also noted the discrepancy with other cables. I have a male to female adapters on each TinySA Ultra to protect the device inputs from wear and tear and also got the same reading when I removed the adapter. Both devices are running firmware version 1.4-78.

Am I forgetting something or is one of the TinySA Ultra devices defective?

Thanks for any suggestions.
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