Hi Erik and all

I updated the report se delete the one I published yesterday.
I now get the same OIP3 figures as you. The levels must be much higher than the -30dBm I used to generate the better OIP3 figures .
However by using a 10dB internal Atten the figures raises 10dB now the TinySA is acting more linear.

The TinySA.exe also show good result on OIP3 but it is needed to toggle the RBW as repeating the measurement is chooses a very strange wide RBW so there is a bug

Kind regards

Kurt

?

?

On Mon, Jul 27, 2020 at 11:22 PM, Erik Kaashoek wrote:

The value of +4.7dBm is surprisingly low. It should be above +15dBm.

Here are my measurements. Only settings changed from default where RBW set to manual 10kHz in second measurement both with attenuation set to manual and 0dB

First two signals at 0dBm with combiner loss of 3dB



Then the same signals set to -10dBm to check if the measurement is OK



The IP3 signals drop indeed 20dB when lowering the input with 10dB so what you see is internally generated.
Adding 10dB input attenuations drops them into the noise floor

I'm very curious why you measure a much different value