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
