+ Post New Thread
Results 1 to 4 of 4
  1. #1
    Full Member level 5
    Points: 1,826, Level: 9

    Join Date
    Apr 2017
    Posts
    275
    Helped
    6 / 6
    Points
    1,826
    Level
    9

    Bluetooth LO Selection

    I have bluetooth transceiver operating from 2.4G to 2.48G with 79 channels with 1MHz width and 1MHz spacing.

    I want to receive Channel 2 in the Receiver.

    What do I sent the LO frequency to be in a heterodyne receiver to capture this Channel 2 ?

    Is is the center of the second channel at 2.404 GHz (edge) or 2.4045 (center of channel) ?

    •   AltAdvertisement

        
       

  2. #2
    Advanced Member level 5
    Points: 17,578, Level: 32
    pancho_hideboo's Avatar
    Join Date
    Oct 2006
    Location
    Real Homeless
    Posts
    2,705
    Helped
    733 / 733
    Points
    17,578
    Level
    32

    Re: Bluetooth LO Selection

    Can you understand frequency hopping ?



    •   AltAdvertisement

        
       

  3. #3
    Super Moderator
    Points: 264,047, Level: 100
    Awards:
    1st Helpful Member

    Join Date
    Jan 2008
    Location
    Bochum, Germany
    Posts
    46,141
    Helped
    14034 / 14034
    Points
    264,047
    Level
    100

    Re: Bluetooth LO Selection

    I understand this as a mostly theoretical question. On the application layer, you don't select frequencies in Bluetooth, this is done by the Bluetooth stack, which uses frequency hopping, as mentioned by pancho_hideboo. You could however refer to a 2.4 GHz OEM protocol where specific channels are selected.

    Technically, most 2.4 GHz front ends on the market have homodyne (zero IF) receivers, thus LO is equal to channel center frequency.


    1 members found this post helpful.

    •   AltAdvertisement

        
       

  4. #4
    Full Member level 5
    Points: 1,826, Level: 9

    Join Date
    Apr 2017
    Posts
    275
    Helped
    6 / 6
    Points
    1,826
    Level
    9

    Re: Bluetooth LO Selection

    So in my case, with the specs I gave, that would be 2.405GHz - is that correct for the 2nd Channel ?



--[[ ]]--