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Sylvain Munaut 246tnt at gmail.com> 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 ... Cheers, Sylvain