Newbie, Sdrconsole, Sdr# and Sdr++

[krizanek]

Without changing anything on the Airspy HF+ , antenna terminated into 50 ohms, agc set to medium, same frequency 11396 kHz and no other dsp.
SDRConsole shows noise floor at -135dbm
SDR++ shows noise floor at -130 dbm
SDR # shows noise floor at -115 dbm.

which one should I consider is better or am I am not understanding properly?
I would think this is the internal noise generated by the Airspy HF + but which SDR software is more accurate?
Measurements were done within a minute or 2.

 

[krizanek]

Even calculating between Sdr ++-130 dbuv to dbm = -221 dbm Equates to SDRconsole. This question is useless To ask because it is difficult to calculate dbfs to dbm.

 

[rabbit108]

Even calculating between Sdr ++-130 dbuv to dbm = -221 dbm Equates to SDRconsole. This question is useless To ask because it is difficult to calculate dbfs to dbm.

Hello, krizanek.

The dbm scales that are used by the different softwares are only relative, not calibrated. The comparisons you are making are not valid.

The only SDR I know of that has a calibrated dBm scale is the SDRplay series using SDRuno software.

 

[krizanek]

Thanks . I was kind of figuring that and you confirmed it for me.