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value at center of filter skirt in SSB

K2KXK
K2KXK Member ✭✭
edited June 2020 in SmartSDR for Windows

Answers

  • Patrick
    Patrick Member ✭✭✭
    edited June 2020
    I think it may be the half power points (3db) of the filters created.   1.5K+1.5K = 3k-2.7K = 300Hz/2 = 150 Hz is ~ 50% point or half power.  I guess that is clear as mud.... 
  • N8AUM
    N8AUM Member ✭✭
    edited February 2020
    Doesn't the 3db point change depending on which setting is used in the filter settings ?
  • Larry - W9FLA
    Larry - W9FLA Member ✭✭
    edited February 2020
  • K2KXK
    K2KXK Member ✭✭
    edited February 2020
    Hi Larry.  Thanks for the great explanation.  I now know what the center value represents.  I'm not sure how I would use this value though.  I guess it's just for informational purposes.
  • Tim - W4TME
    Tim - W4TME Administrator, FlexRadio Employee admin
    edited February 2020
    It is used for operating digital modes, like PSK31 where you may want to know the center frequency offset for the receive filter if you are also using a narrow TX filter in the center of the RX passband.
  • K2KXK
    K2KXK Member ✭✭
    edited February 2020
    Makes sense Tim.  Thanks.
  • Tim - W4TME
    Tim - W4TME Administrator, FlexRadio Employee admin
    edited February 2020
    You're welcome.

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