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db & dbm

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  • #64113 Reply
    DT Analyser

    Hi Experts,

    I’m confusing these units.

    For example: CRO is in db, RxLev is in dbm.

    If I change CRO to 6 db, in this case what is relation between RxLevel or dbm?

    #64114 Reply

    dB is a “relative” difference between 2 measurements in dBm.

    for example :
    RxLev = -80dBm
    When the signal increases by 3dB, the new RxLev is -77dBm.

    CRO is an offset applied on the formula of C2.

    C2 = rxlev – RXLEVACCESSMIN + CRO
    rxlev-RXLEVACCESSMIN = dBm – dBm = dB
    CRO is also in dB
    C2 is in dB
    C2 represents the difference of signals levels “rxlev” and “RXLEVACCESSMIN”, plus a certain offset.

    dBm represents a received power :
    0dBm = 1mW
    -3dBm = 0.5mW
    -6dBm = 0.25mW

    dB is “relative” 🙂

    look for other threads about this, you’ll find plenty.


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