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Date: Wed, 21 Oct 2015 11:13:57 +0100
Message-ID: <CAA8k23SL+77iv-eHB_=PM5Bh8PEhn47M8JWOtCtCqVFgFdodHA@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: SSB modulation for WSPR
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Need to ask the obvious - is the frequency recorded in Joe's spots the
actual one you were transmitting on?  Exactly, spot on, to the Hz ?
When you say I and Q are "somewhat different",  do you mean, the wrong way
round, or unequal amplitued, or not in quadrature. All would contribute to
a component on the wrong sideband and / or frequency  as well as the
correct one

Seems a bit odd that your one actual decoded spot was quite weak copy at a
respectable distance.   Judging from my dual mode transmission the other
day, there are quite a few monitoring stations closer.


Andy

On 21 October 2015 at 10:15, LineOne <dhchurch@lineone.net> wrote:

> So far the only person to decode my WSPR transmissions is Joe, DF2JP.
>
> I made a drive unit for 136kHz to utilise 4 different methods of
> modulation including quadrature switching for SSB. Having just discovered
> that a fault caused the I and Q channels to be somewhat different I
> wondered what the effect would be and why Joe was the only one to decode it?
>
> The carrier frequency is never more than 0.8Hz out, time is spot on via
> GMT (UTC) and the sound card is perfectly accurate so receive decoding is
> good.
>
> Hugh, M0DSZ.
>
> (P.S. I have no intention of signing up to Yahoo).
>
>
>
>

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<div dir=3D"ltr">Need to ask the obvious - is the frequency recorded in Joe=
&#39;s spots the actual one you were transmitting on?=C2=A0 Exactly, spot o=
n, to the Hz ?<div>When you say I and Q are &quot;somewhat different&quot;,=
 =C2=A0do you mean, the wrong way round, or unequal amplitued, or not in qu=
adrature. All would contribute to a component on the wrong sideband and / o=
r frequency =C2=A0as well as the correct one</div><div><br></div><div>Seems=
 a bit odd that your one actual decoded spot was quite weak copy at a respe=
ctable distance. =C2=A0 Judging from my dual mode transmission the other da=
y, there are quite a few monitoring stations closer.</div><div><br></div><d=
iv><br></div><div>Andy<br><div class=3D"gmail_extra"><br><div class=3D"gmai=
l_quote">On 21 October 2015 at 10:15, LineOne <span dir=3D"ltr">&lt;<a href=
=3D"mailto:dhchurch@lineone.net" target=3D"_blank">dhchurch@lineone.net</a>=
&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0=
 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">So far the only person=
 to decode my WSPR transmissions is Joe, DF2JP.<br>
<br>
I made a drive unit for 136kHz to utilise 4 different methods of modulation=
 including quadrature switching for SSB. Having just discovered that a faul=
t caused the I and Q channels to be somewhat different I wondered what the =
effect would be and why Joe was the only one to decode it?<br>
<br>
The carrier frequency is never more than 0.8Hz out, time is spot on via GMT=
 (UTC) and the sound card is perfectly accurate so receive decoding is good=
.<br>
<br>
Hugh, M0DSZ.<br>
<br>
(P.S. I have no intention of signing up to Yahoo).<br>
<br>
<br>
<br>
</blockquote></div><br></div></div></div>

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