Can't get below -46 dB

Sylvain Munaut 246tnt at
Tue Apr 16 10:34:35 UTC 2013

>     I have an Elonics 4000 USB receiver, and I-m trying to do some
> measurements on the digital television received power in my area. Everything
> works fine, except that the received power is never lower than -46 dB, even
> on channel which are not occupied. I was expecting to get values like -120
> dB or something similar, instead in my measurements the lowest point in any
> portion of the spectrum is circa -46 dB.
> Am I missing something?

Yes ... those are not absolute dBm values ... There is no calibration
whatsoever so the '0dB' level doesn't mean 0 dBm at all ...



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