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Re: Skimmer bandwidth

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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 1 of 10 , Feb 18, 2009
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      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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