Changes in calibration Level and Noise floor
Posted: Thu Mar 16, 2017 12:49 pm
I am applying a calibration signal to the SDRPlay RSP2 Pro and have, on several occasions, seen the noise floor and the recorded signal level drop abruptly by roughly 3 dB. The signal input level is constant - I am monitoring it also on another receiver setup (FCDP+) The levels have never gone higher. In the latest test there is a period of over 7 hours at one level, a drop to a level maintained for around 3 hours and then another drop. The calibration signal is 30 dB above the noise floor. Any ideas ?