[Lowfer] MSK Question

[David L. Wilson]

Also, the experimental high accuracy DGPS signals like from Hagerstown
(actually Lappans), MD are said to be cosine filtered MSK (the DGPS around
300 MHz is not).  It has an odd sound with regular "burps" which causes the
spectrum to have peaks over the shape every 167 Hz.   I think that may be
due to the data content rather than the form of the filtering but really do
not know.  But then the regular DPGS (both 100 Bd and 200 Bd) around 300 kHz
have their oddity of peaks riding the top of the high peak.

--
David L. Wilson
dwilson314 at verizon.net


> -----Original Message-----
> From: lowfer-bounces at mailman.qth.net [mailto:lowfer-
> bounces at mailman.qth.net] On Behalf Of n8tl
> Sent: Sunday, March 13, 2011 3:05 PM
> To: lowfer at mailman.qth.net
> Subject: Re: [Lowfer] MSK Question
> 
> David...thanks for the info...Tom N8TL
> 
> On Sun, 13 Mar 2011 09:00:30 -0400
> "David L. Wilson" <dwilson314 at verizon.net> wrote:
> 
> > I think it looks like straight MSK from what I have read and in cases
> > I have checked, the spectrum of the audio matched simulations of
straight
> MSK.
> > Ref.
> >
> > [PPT] Introduction to GMSK: Gaussian Filtered Minimum Shift Keying
> > File
> > Format: Microsoft Powerpoint - Quick View GMSK or Gaussian-filtered
> > Minimum Shift Keying differs from MSK in that a Gaussian Filter of an
> > appropriate bandwidth is used before the modulation stage. ...
> > www.eecs.tufts.edu/~gcolan01/Course_Work/Intro_to_GMSK.ppt
> > --
> > David L. Wilson
> > dwilson314 at verizon.net
> >
> >
> > > -----Original Message-----
> > > From: lowfer-bounces at mailman.qth.net [mailto:lowfer-
> > > bounces at mailman.qth.net] On Behalf Of n8tl
> > > Sent: Sunday, March 13, 2011 8:06 AM
> > > To: lowfer
> > > Subject: [Lowfer] MSK Question
> > >
> > >
> > > A quick question....is the MSK we hear on VLF 5-30 Khz straight MSK
> > > or is
> > it
> > > > Gaussian Filtered MSK???
> > >
> > > Thanks, and regards,
> > >
> > > Tom N8TL
> > >
> > > --
> > > n8tl <n8tl at woh.rr.com>
> > >
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> --
> n8tl <n8tl at woh.rr.com>
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