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Date: Thu, 3 Mar 2011 19:52:04 +0000
Message-ID: <AANLkTi==u+2HCy8udY15t5dQon0Zm4bu-KzaKDSdEF03@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org
DomainKey-Status: good (testing) 
Subject: Re: LF: Topband Test
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http://www.g4jnt.com/Download/1967jnt1.jpg
http://www.g4jnt.com/Download/1967jnt3.jpg
http://www.g4jnt.com/Download/1967jnt4.jpg

Are three plots of a 4 Watt RF  (probably no more than 500mW ERP) 1967kHz
signal transmitted to G3PLX at a distance of 393km.

The numbers along the bottom are UTC hours, but I have no record of the
vertical frequency span.   Going on distant memory,  The EVM driver /
plotting software writen by Peter used 3.125, 6.25, 12.5 Hz plots, so I
guess the width is one of those two lower values.

 The signal starts waving about all over the place once it gets dark!

These plots were made over the period 20 - 23 Jan 1998 according to the date
on the original files,  so roughly 'about' the same point in the last
sunspot cycle as we now are in the current one, but a bit earlier in the
year.

These plots pre-dated low cost simple  GPS stabilised sources, but I did
have a very good ovenned oscillator and an MSF locked standard, that could
maintain 10^-9 over the duration of the transmission; and a
synthesizer.  Essential  requisites for this at the time ground-breaking
amateur experimentation.   Now anyone can do it :-)

Andy
'JNT



On 3 March 2011 18:55, Chris <c.ashby435@btinternet.com> wrote:

>  Hi All,
> Yesterday evening Pete, M0FMT, transmitted QRSS on topband for a test. An
> unexpected effect was noticed with the trace splitting in two. Nothing new
> or 'earth shattering' I expect, but new to us and worthy of further
> experimentation.
> See the result and conclusion on my website http://qsl.net/g4ayt on the
> bottom of page 1.
> I have never seen this effect on 137, even with quite strong audible
> signals, maybe others have.
> Vy 73,
> Chris, G4AYT, Whitstable, UK.
>

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Content-Transfer-Encoding: quoted-printable

<div><a href=3D"http://www.g4jnt.com/Download/1967jnt1.jpg">http://www.g4j=
nt.com/Download/1967jnt1.jpg</a></div>
<div><a href=3D"http://www.g4jnt.com/Download/1967jnt3.jpg">http://www.g4j=
nt.com/Download/1967jnt3.jpg</a></div>
<div><a href=3D"http://www.g4jnt.com/Download/1967jnt4.jpg">http://www.g4j=
nt.com/Download/1967jnt4.jpg</a></div>
<div>=A0</div>
<div>Are three plots of=A0a 4 Watt=A0RF =A0(probably no more than 500mW ER=
P) 1967kHz signal transmitted to G3PLX at a distance of 393km.</div>
<div>=A0</div>
<div>The numbers along the bottom are UTC hours, but I have no record of=
 the vertical frequency span.=A0=A0=A0Going on distant memory, =A0The EVM=
 driver / plotting=A0software writen by Peter used 3.125, 6.25, 12.5 Hz pl=
ots, so I guess the width is one of those two lower values.</div>

<div>=A0</div>
<div>
<div>The signal starts waving about all over the place once it gets dark!<=
/div>
<div>=A0</div></div>
<div>These plots were made=A0over the period 20 - 23=A0Jan 1998 according=
 to the date on the=A0original files, =A0so roughly=A0&#39;about&#39; the=
 same point in the last sunspot cycle as we now=A0are in the current one,=
 but a bit earlier in the year.=A0=A0 </div>

<div>=A0</div>
<div>These plots pre-dated=A0low cost simple =A0GPS stabilised sources, bu=
t I did have a very good ovenned oscillator and an MSF locked standard,=A0=
that could maintain 10^-9 over the duration of the transmission; and a syn=
thesizer.=A0=A0Essential=A0=A0requisites for this at the time ground-break=
ing amateur experimentation.=A0=A0 Now anyone can do it :-)</div>

<div>=A0</div>
<div>Andy</div>
<div>&#39;JNT</div>
<div>=A0</div>
<div><br>=A0</div>
<div class=3D"gmail_quote">On 3 March 2011 18:55, Chris <span dir=3D"ltr">=
&lt;<a href=3D"mailto:c.ashby435@btinternet.com">c.ashby435@btinternet.com=
</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">
<div bgcolor=3D"#ffffff">
<div><font size=3D"2" face=3D"Arial">Hi All,</font></div>
<div><font size=3D"2" face=3D"Arial">Yesterday evening Pete, M0FMT, transm=
itted QRSS on topband for a test. An unexpected effect was noticed with th=
e trace splitting in two. Nothing new or &#39;earth shattering&#39; I expe=
ct, but new to us and worthy of further experimentation.</font></div>

<div><font size=3D"2" face=3D"Arial">See the result and conclusion on my=
 website <a href=3D"http://qsl.net/g4ayt" target=3D"_blank">http://qsl.net=
/g4ayt</a> on the bottom of page 1.</font></div>
<div><font size=3D"2" face=3D"Arial">I have never seen this effect on 137,=
 even with quite strong audible signals, maybe others have.</font></div>
<div><font size=3D"2" face=3D"Arial">Vy 73,</font></div>
<div><font size=3D"2" face=3D"Arial">Chris, G4AYT, Whitstable, UK.</font><=
/div></div></blockquote></div><br>

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