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References: <CD23FAD2-C25C-4491-B7A6-66370074F9DB@hurontel.on.ca>
Date: Thu, 29 Jul 2010 22:07:16 +0100
Message-ID: <AANLkTi=-0nwKg3SiO683YX4Wo5oq5aQ74aE5pSbbyv02@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@googlemail.com>
To: rsgb_lf_group@blacksheep.org
DomainKey-Status: good (testing) 
Subject: Re: LF: Digital modes comparison
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It would be very interesting to see those figures normalised to a constant
data rate / bandwidth.  For example, PSK31 shown at -10dB is identical to
PKK63 at -7dB - well it would be, its the same modulation, just faster.   Ie
plot Bits/second/Hz vs. Eb/No, then stick the Shannon limit on the graph and
see which lie nearest.

The fact that JT65 is at the top is probably because it sits at around 0.27
chars / second, or something like 1.2 B/s.  Although even after
normalisation, it would no doubt still score well up.


Andy
www.g4jnt.com


On 29 July 2010 21:48, John Bruce McCreath <weazle@hurontel.on.ca> wrote:

> Hello LFers,
>
> I found this while web browsing....interesting reading and Mal's favourite
> mode isn't top dog.
>
> http://kb2hsh.blogspot.com/2010/05/capabilities-of-weak-signal-digital.html
>
> I was looking for sites having info about digital modes on 1,800 kHz. and
> lower frequencies.
>
> 73, J.B., VE3EAR
>
> LowFER Beacon "EAR"
> 188.830 kHz. QRSS30
> EN93dr
>
>
>
>
>
>
>

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<div>It would be very interesting to see those figures normalised to a con=
stant data rate / bandwidth.=A0 For example, PSK31 shown at -10dB is ident=
ical to PKK63 at -7dB - well it would be, its the same modulation, just fa=
ster.=A0=A0 Ie plot Bits/second/Hz vs. Eb/No, then stick the Shannon limit=
 on the graph and see which lie nearest.</div>

<div>=A0</div>
<div>The fact that JT65 is at the top is probably because it sits at aroun=
d 0.27 chars / second, or something like 1.2 B/s.=A0 Although even after=
 normalisation, it would no doubt still score=A0well up.</div>
<div>=A0</div>
<div><br clear=3D"all">Andy<br><a href=3D"http://www.g4jnt.com">www.g4jnt.=
com</a><br><br><br></div>
<div class=3D"gmail_quote">On 29 July 2010 21:48, John Bruce McCreath <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:weazle@hurontel.on.ca">weazle@hurontel=
.on.ca</a>&gt;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8e=
x; PADDING-LEFT: 1ex" class=3D"gmail_quote">Hello LFers,<br><br>I found th=
is while web browsing....interesting reading and Mal&#39;s favourite mode=
 isn&#39;t top dog.<br>
<br><a href=3D"http://kb2hsh.blogspot.com/2010/05/capabilities-of-weak-sig=
nal-digital.html" target=3D"_blank">http://kb2hsh.blogspot.com/2010/05/cap=
abilities-of-weak-signal-digital.html</a><br><br>I was looking for sites=
 having info about digital modes on 1,800 kHz. and lower frequencies.<br>
<br>73, J.B., VE3EAR<br><br>LowFER Beacon &quot;EAR&quot;<br>188.830 kHz.=
 QRSS30<br>EN93dr<br><br><br><br><br><br><br></blockquote></div><br>

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