Re: [Discuss-gnuradio] Re: wrong dB

[Brian Padalino]

On Tue, Mar 3, 2009 at 12:16 PM, Markus Feldmann <address@hidden> wrote:
> Martin Braun schrieb:
>>
>> Don't confuse dB and dBW. You want to see -60dBW, but you see -11.9dB.
>> That's because your justing looking at numbers, not voltages.
>
> However there should be a reference point ?
> So if you are right, which is the reference number ?
> From this to my Number should be a difference of 60dB.

Usually when dealing with ADCs, the reference is a full scale conversion (dBFS).

The amount of gain applied to the signal externally may very well be
unknown to the system, but you can still maintain some level of
confidence of signal levels using dBFS.

    http://en.wikipedia.org/wiki/DBFS

Brian