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Date: Thu, 14 Mar 2013 16:46:04 +0000
From: g3zjo <g3zjo@psk31.plus.com>
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References: <513E5241.40807@psk31.plus.com> <513E6015.30901@psk31.plus.com> <514092DF.3030500@iup.uni-heidelberg.de> <5140E1AD.5030606@psk31.plus.com> <51419D5E.3050703@iup.uni-heidelberg.de> <5141F45E.2060507@psk31.plus.com>
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Subject: Re: LF: 630m Narrow Keyboard Mode
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Further information :-
  I am running 15.625Hz Wide GMSK The frequency shift is half the bit rate.

Here I include some quotes.
Gaussian Minimum Shift Keying, or to give it its full title Gaussian 
filtered Minimum Shift Keying, GMSK, is a form of modulation used in a 
variety of digital radio communications systems. It has advantages of 
being able to carry digital modulation while still using the spectrum 
efficiently.
GMSK modulation is based on MSK, which is itself a form of 
continuous-phase frequency-shift keying. One of the problems with 
standard forms of PSK is that sidebands extend out from the carrier. To 
overcome this, MSK and its derivative GMSK can be used.

There are several advantages to the use of GMSK modulation for a radio 
communications system. One is obviously the improved spectral efficiency 
when compared to other phase shift keyed modes.
(PSK31 for instance although this mode is also using Varicode).
It is immune to amplitude variations and therefore more resilient to 
noise, than some other forms of modulation. A further advantage of GMSK 
is that it can be amplified by a non-linear amplifier and remain 
undistorted.

Eddie G3ZJO


On 14/03/2013 16:01, g3zjo wrote:
> Running GMSK Beacon now on 476.100KHz
>
> GMSK Is in MMVari Software.
>
> Non decoded reports of my signal welcome.
>
> 73 Eddie G3ZJO
>


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    Further information :-<br>
    &nbsp;I am running 15.625Hz Wide GMSK The frequency shift is half the bit
    rate.<br>
    <br>
    Here I include some quotes.<br>
    Gaussian Minimum Shift Keying, or to give it its full title Gaussian
    filtered Minimum Shift Keying, GMSK, is a form of modulation used in
    a variety of digital radio communications systems. It has advantages
    of being able to carry digital modulation while still using the
    spectrum efficiently.<br>
    GMSK modulation is based on MSK, which is itself a form of
    continuous-phase frequency-shift keying. One of the problems with
    standard forms of PSK is that sidebands extend out from the carrier.
    To overcome this, MSK and its derivative GMSK can be used.<br>
    <p align="justify">There are several advantages to the use of GMSK
      modulation for a radio communications system. One is obviously the
      improved spectral efficiency when compared to other phase shift
      keyed modes. <br>
      (PSK31 for instance although this mode is also using Varicode). <br>
      It is immune to amplitude variations and therefore more resilient
      to noise, than some other forms of modulation. A further advantage
      of GMSK is that it can be amplified by a non-linear amplifier and
      remain undistorted.<br>
    </p>
    <p align="justify">Eddie G3ZJO<br>
    </p>
    <br>
    On 14/03/2013 16:01, g3zjo wrote:
    <blockquote cite="mid:5141F45E.2060507@psk31.plus.com" type="cite">
      <meta content="text/html; charset=ISO-8859-1"
        http-equiv="Content-Type">
      Running GMSK Beacon now on 476.100KHz<br>
      <br>
      GMSK Is in MMVari Software.<br>
      <br>
      Non decoded reports of my signal welcome.<br>
      <br>
      73 Eddie G3ZJO <br>
      <br>
    </blockquote>
    <br>
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