HELP:9mhz roofing filter

Discussion in 'Wireless & RF Design' started by hamopp, Jan 21, 2012.

  1. hamopp

    Thread Starter Active Member

    May 13, 2009
    68
    1
    Hi all
    thinking of place a 9mhz roofing filter after the first mixer (SBL-1)in the rcvr.
    but it will have to have a BW of about 16khz!, to allow for FM BW
    i was thinking of designing a 9 MHZ roofing filter with a BW of 16khz, with 9mhz crystals.
    can anyone help with such a design ?
    Thanks
    Hamopp
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. hamopp

    Thread Starter Active Member

    May 13, 2009
    68
    1
    Hi
    wow that is some learning!
    any hints
    is it best to get the crystals first, do they have to all be 9.0000Mhz ?
    which is the best type of filter to use ?
    the sbl-1 mixer output is 50Ω, so is that the filter input ?

    as you can see i have not done anything like this before, i just buy filters
    but i could not find a 9Mhz @16Khz BW filter.

    Thanks
    hamopp
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
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