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RE: [dxatlas] Skimmer bandwidth

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  • W0MU Mike Fatchett
    Alright. Maybe you will get bored soon and open that up :) Gimme an inch I will take a mile. A slip of the foot you may soon recover, but a slip of the
    Message 1 of 10 , Feb 18, 2009
      Alright. Maybe you will get bored soon and open that up :)

      Gimme an inch I will take a mile.


      "A slip of the foot you may soon recover, but a slip of the tongue you may
      never get over." Ben Franklin
      -----Original Message-----
      From: dxatlas_group@yahoogroups.com [mailto:dxatlas_group@yahoogroups.com]
      On Behalf Of Alex, VE3NEA
      Sent: Wednesday, February 18, 2009 4:48 PM
      To: dxatlas_group@yahoogroups.com
      Subject: Re: [dxatlas] Skimmer bandwidth

      Mike,

      This would be very difficult. The modes that support CAT control can have
      only a 3 kHz or 24 kHz bandwidth, this is hardcoded at the very bottom of
      the Skimmer architecture.

      73 Alex VE3NEA



      ----- Original Message -----
      From: "W0MU Mike Fatchett" <w0mu@...>
      To: <dxatlas_group@yahoogroups.com>
      Sent: Wednesday, February 18, 2009 06:36 PM
      Subject: [dxatlas] Skimmer bandwidth


      > That makes sense.
      >
      > From what I understand skimmer will only decode over a 24khz range. Are
      > there any plans to open this range up for people with 192k sound cards and
      > LP-PAN?
      >
      > Any plans for an RTTY skimmer?
      >
      > Mike
      >
      >
      > "A slip of the foot you may soon recover, but a slip of the tongue you may
      > never get over." Ben Franklin
      > -----Original Message-----
      > From: dxatlas_group@yahoogroups.com [mailto:dxatlas_group@yahoogroups.com]
      > On Behalf Of Alex, VE3NEA
      > Sent: Wednesday, February 18, 2009 4:26 PM
      > To: dxatlas_group@yahoogroups.com
      > Subject: Re: [dxatlas] Demo Version
      >
      > Hi Mike,
      >
      > I experimented a lot with different waterfall resolutions and found out
      > that
      > the resolutions other than that used in CW Skimmer work very poorly for
      > DXing, contesting, pileup cracking, etc. Lower resolutions make it
      > difficult
      > to read Morse Code visually, do not allow you to accurately set the
      > frequency, make the bandmap too crowded, etc. I decided to hardcode the
      > optimal resolution in the program. As a side benefit, this allowed me to
      > implement waterfall panning - you can drag the waterfall vertically and
      > see
      > what is above and below the current window. Rocky has variable resolution
      > but does not have panning: these two functions are mutually exclusive.
      >
      > Of course, nothing prevents CW Skimmer from decoding CW on the frequencies
      > that are not visible on the screen, decoding is independent of the
      > display.
      >
      > 73 Alex VE3NEA
      >
      >
      >
      >



      ------------------------------------

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    • ve7tk
      Thanks for the clarification Alex. I m currently running 1440 x 900 and that s as good as it gets with the on-board video. I think I can live with it! 73,
      Message 2 of 10 , Feb 18, 2009
        Thanks for the clarification Alex. I'm currently running 1440 x 900
        and that's as good as it gets with the on-board video. I think I can
        live with it!

        73,
        Rick
        VE7TK

        --- In dxatlas_group@yahoogroups.com, "Alex, VE3NEA" <alshovk@...> wrote:
        >
        > Hi Rick,
        >
        > CW Skimmer produces 24 kHz of spectrum in the SoftRock-IF mode but
        displays
        > only as much as your screen allows. You need a higher resolution
        monitor to
        > see more spectrum on the waterfall. Note that it still decodes all
        24 kHz,
        > even the parts that you cannot see.
        >
        > 73 Alex VE3NEA
        >
        >
        > ----- Original Message -----
        > From: "ve7tk" <ve7tk@...>
        > To: <dxatlas_group@yahoogroups.com>
        > Sent: Wednesday, February 18, 2009 06:57 PM
        > Subject: Re: [dxatlas] Skimmer bandwidth
        >
        >
        > Since we're on the issue of bandwidth I have a question. Using
        > CWSkimmer 1.4 I get a bandwidth of +/- 9 Khz. Or a total bandwidth of
        > 18 kHz. What has happened to the other 6 kHz?
        >
        > Don't get me wrong, 18 kHz is really good but I was wondering if I
        > have something set incorrectly or is this normal?
        >
        > I'm using a Ten-Tec Orion, LP-PAN, 192 kHz E-Mu 0202 sound card and
        > SoftRock-IF.
        >
        > Thanks,
        >
        > Rick
        > VE7TK
        >
        > --- In dxatlas_group@yahoogroups.com, "Alex, VE3NEA" <alshovk@> wrote:
        > >
        > > Mike,
        > >
        > > This would be very difficult. The modes that support CAT control can
        > have
        > > only a 3 kHz or 24 kHz bandwidth, this is hardcoded at the very
        > bottom of
        > > the Skimmer architecture.
        > >
        > > 73 Alex VE3NEA
        > >
        > >
        > >
        > > ----- Original Message -----
        > > From: "W0MU Mike Fatchett" <w0mu@>
        > > To: <dxatlas_group@yahoogroups.com>
        > > Sent: Wednesday, February 18, 2009 06:36 PM
        > > Subject: [dxatlas] Skimmer bandwidth
        > >
        > >
        > > > That makes sense.
        > > >
        > > > From what I understand skimmer will only decode over a 24khz
        > range. Are
        > > > there any plans to open this range up for people with 192k sound
        > cards and
        > > > LP-PAN?
        > > >
        > > > Any plans for an RTTY skimmer?
        > > >
        > > > Mike
        > > >
        > > >
        > > > "A slip of the foot you may soon recover, but a slip of the tongue
        > you may
        > > > never get over." Ben Franklin
        > > > -----Original Message-----
        > > > From: dxatlas_group@yahoogroups.com
        > [mailto:dxatlas_group@yahoogroups.com]
        > > > On Behalf Of Alex, VE3NEA
        > > > Sent: Wednesday, February 18, 2009 4:26 PM
        > > > To: dxatlas_group@yahoogroups.com
        > > > Subject: Re: [dxatlas] Demo Version
        > > >
        > > > Hi Mike,
        > > >
        > > > I experimented a lot with different waterfall resolutions and
        > found out
        > > > that
        > > > the resolutions other than that used in CW Skimmer work very
        > poorly for
        > > > DXing, contesting, pileup cracking, etc. Lower resolutions make it
        > > > difficult
        > > > to read Morse Code visually, do not allow you to accurately set the
        > > > frequency, make the bandmap too crowded, etc. I decided to
        > hardcode the
        > > > optimal resolution in the program. As a side benefit, this allowed
        > me to
        > > > implement waterfall panning - you can drag the waterfall
        > vertically and
        > > > see
        > > > what is above and below the current window. Rocky has variable
        > resolution
        > > > but does not have panning: these two functions are mutually
        exclusive.
        > > >
        > > > Of course, nothing prevents CW Skimmer from decoding CW on the
        > frequencies
        > > > that are not visible on the screen, decoding is independent of the
        > > > display.
        > > >
        > > > 73 Alex VE3NEA
        > > >
        > > >
        > > >
        > > >
        > >
        >
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