On Mon, Aug 31, 2020 at 06:32 AM, hwalker wrote:
Why does the level of the signals appear to change when switching from 0 to 10 dB attenuation?
Interesting question!
The clock ingress happens after the attenuator so it stays the same level when the attenuation increases. But the calculation assumes all signals are reduced by the attenuation so it increases everything with the set attenuation.
When you connect an antenna to the tinySA and you put that antenna close to the MCU (make sure the clock signals are substantial above -80dBm) the signals will NOT increase when you increase the attenuation unless you attenuate so the signal from the antenna is weaker than the direct ingress after the attenuator.
The noise floor is also "created" after the attenuator and also increases with the amount of attenuation
