Changes in calibration Level and Noise floor

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MTG
Posts: 3
Joined: Sun Feb 12, 2017 6:07 pm

Changes in calibration Level and Noise floor

Postby MTG » 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 ?
Last edited by MTG on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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