---
+ Post New Thread
Results 1 to 10 of 10
  1. #1
    Newbie level 1
    Points: 693, Level: 5

    Join Date
    Jan 2009
    Location
    San Jose, CA, USA
    Posts
    1
    Helped
    0 / 0
    Points
    693
    Level
    5

    dbc dbm

    How to convert dBc to dBm? Thanks.

  2. #2
    Full Member level 6
    Points: 4,150, Level: 15
    RealAEL's Avatar
    Join Date
    May 2008
    Location
    Hotel California
    Posts
    338
    Helped
    218 / 218
    Points
    4,150
    Level
    15

    dbc to dbm

    dBm and dBc are completely different so there is no 'conversion' between the two.

    dBm - indicates the power measurement relative to 1 milliwatt. 0 dBm means no change from 1 mW, i.e. a power of exactly 1 mW. 3 dBm means 3 dB greater than 0 dBm. dBm is the relative difference to a fixed reference power of 1 mW.

    dBc — indicates the power relative to the power of the main carrier frequency; typically used to describe spurs, noise, channel crosstalk, and intermodal signals which may interfere with the carrier. dBc is the relative difference to an arbitrary reference power level, the power level of the carrier frequency.



    •   Alt31st January 2009, 04:13

      advertising

        
       

  3. #3
    Advanced Member level 5
    Points: 29,596, Level: 41

    Join Date
    Dec 2004
    Location
    New England, USA
    Posts
    4,123
    Helped
    1130 / 1130
    Points
    29,596
    Level
    41

    dbm dbc

    well, you could convert between them for a specific application. If you had a spur that was -50 dBc, and the carrier was at +10 dBm, then the spur would also be at -40 dBm.



  4. #4
    Full Member level 2
    Points: 1,679, Level: 9

    Join Date
    Oct 2008
    Location
    USA
    Posts
    133
    Helped
    2 / 2
    Points
    1,679
    Level
    9

    dbm to dbc

    Both of RealAEL and biff44 are right.dBm is compared with 1mW(dBm=10log(Power/1mW),and dBc is compared with carrier power(carrier(dBm)-power(dBm)).



    •   Alt31st January 2009, 23:47

      advertising

        
       

  5. #5
    Full Member level 2
    Points: 2,154, Level: 10

    Join Date
    Jul 2005
    Posts
    120
    Helped
    10 / 10
    Points
    2,154
    Level
    10

    dbm to dbc conversion

    I think RealAEL is wrong and biff44 is right.



  6. #6
    Advanced Member level 5
    Points: 29,596, Level: 41

    Join Date
    Dec 2004
    Location
    New England, USA
    Posts
    4,123
    Helped
    1130 / 1130
    Points
    29,596
    Level
    41

    convert dbm to dbc

    everything RealAEL said is correct. I just gave a numerical example to further clarify his point.



  7. #7
    Full Member level 2
    Points: 2,154, Level: 10

    Join Date
    Jul 2005
    Posts
    120
    Helped
    10 / 10
    Points
    2,154
    Level
    10

    dbc to dbm conversion

    Update: I think RealAEL is wrong and biff44 is wrong.



  8. #8
    LvW
    LvW is offline
    Advanced Member level 5
    Points: 36,120, Level: 46
    LvW's Avatar
    Join Date
    May 2008
    Location
    Germany
    Posts
    5,155
    Helped
    1524 / 1524
    Points
    36,120
    Level
    46

    convert dbc to dbm

    Quote Originally Posted by yendori
    Update: I think RealAEL is wrong and biff44 is wrong.
    If you know that both are wrong, then I conclude that you own the truth. Right ?
    May we share your knowledge ?



  9. #9
    Full Member level 2
    Points: 2,154, Level: 10

    Join Date
    Jul 2005
    Posts
    120
    Helped
    10 / 10
    Points
    2,154
    Level
    10

    dbc power

    If you know that both are wrong, then I conclude that you own the truth. Right ?
    LvW is right.

    May we share your knowledge ?
    No



  10. #10
    Newbie level 1
    Points: 640, Level: 5

    Join Date
    May 2009
    Posts
    1
    Helped
    0 / 0
    Points
    640
    Level
    5

    How to convert dBc to dBm? Thanks.

    I think RealAEL is right



+ Post New Thread
Please login