Hi Erik

I also wondered about this low value. The -27dBm – 3dB is far to low a level but I could not produce a higher level of time of writing. ?That is simply that my R&S CRTU port 3 which produces such high level was destroyed during the TinySA testing because my HP power meter as the only one did not by my mistake had an AC plug with ground, and when I wanted to measure the output level on port 3 the N center conductor was getting contact prior to ground and “puf” port 3 killed. The old HP instruments has AC filters with large filter capacitances and are bloody dangerous. Shit happens.

I will take my Stabilock and use that and update the document and also try out using the TinySA.exe

Kind regards

Kurt ???

?

?

On Mon, Jul 27, 2020 at 02:15 PM, Kurt Poulsen wrote:

, and also two amplifiers OIP3 and there was a considerable difference.

Kurt

In your document you state: "The combined signal tested with the R&S CRTU-RU And the IOP3 lower than -75dB relative carrier levels so it seem like the TinySA has an build in IOP3 of 4.7dB which is correctly calculated as rule of thumb is Pout + delta P/2 . That means The two testsignal with level -27dBm and combiner loss 3dB."

I guess IOP3 should be IIP3?
The value of +4.7dBm is surprisingly low. It should be above +15dBm.
See?
Can you check what happens when you increase the mixer drive?
CONFIG/EXPERT CONFIG/MIXER DRIVE
and try +10dBm and +13dBm.
This should increase the noise floor a bit but IIP3 may increase.