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From: Riccardo Zoli <riccardozoli80@gmail.com>
Date: Fri, 25 Jan 2019 13:16:37 +0100
Message-ID: <CANA3B6XBZV55TBrATei_pUhdX9oyBHnh8h=NiB72kqv7NBHz1w@mail.gmail.com>
To: LF Group <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: NEO-M8T and H-mixer (SDR)
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Hi Markus,

thank you for the colour phase meter implemeted on your RDF instance, very
useful for me last night. It was reproducing exactly the phase displayed on
my SL's spectrogram, even in case of interruption, unless slight variations
due to propagation.

All the best

73 de Riccardo IW4DXW


Il giorno Ven 25 Gen 2019, 00:59 Markus Vester <markusvester@aol.com> ha
scritto:

> Hi Ric,
>
> Good idea! You can check the effect on my grabber: I've injected an
> auxiliary carrier into the right channel of the topmost speclab instance,
> so the colour on your frequency indicates phase instead of azimuth. If yo=
u
> like you could temporarily interrupt the carrier and verify that it comes
> back with same phase.
>
> Autodecoders are looking out for you and Joe, like last night.
>
> Best 73,
> Markus
>
>
>
>
> -----Urspr=C3=BCngliche Mitteilung-----
> Von: Riccardo Zoli <riccardozoli80@gmail.com>
> An: LF Group <rsgb_lf_group@blacksheep.org>
> Verschickt: Do, 24. Jan. 2019 23:56
> Betreff: LF: NEO-M8T and H-mixer (SDR)
>
>
> LF,
>
> I'm testing a useful trick to allow a quadrature generator to mantain a
> stable and nominal phase using a GPS module NEO/LEA-M8T.
> Normally, an IC 74HC74 is used to generate the quadrature LO signals for =
a
> H-mixer (typically in a SDR "Softrock style").
> Clocking the IC with TP2 signal (f * 4, so 544 kHz to obtain a 136 kHz
> frequency conversion), there is a 90 deg. step phase ambiguity.
> Furthermore, with an undesiderate glitch on the reference clock signal, t=
he
> phase could wrongly rotate.
> So: resetting (clear) the two D flip-flops of the 74HC74 on rising edge o=
f
> the 1PPS pulse, already reference for PC audio-card, we can keep nominal
> phasing which is restored every second.
>
>
> All the best
>
>
> 73 de Riccardo IW4DXW
>
>
>
>

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<div dir=3D"auto"><div dir=3D"auto"><div dir=3D"auto"><br></div><div dir=3D=
"auto">Hi Markus,</div><div dir=3D"auto"><br></div><div dir=3D"auto">thank =
you for the colour phase meter implemeted on your RDF instance, very useful=
 for me last night. It was reproducing exactly the phase displayed on my SL=
&#39;s spectrogram, even in case of interruption, unless slight variations =
due to propagation.</div><div dir=3D"auto"><br></div><div dir=3D"auto">All =
the best</div><div dir=3D"auto"><br></div><div dir=3D"auto">73 de Riccardo =
IW4DXW</div><div dir=3D"auto"><br></div></div><br><div class=3D"gmail_quote=
"><div dir=3D"ltr">Il giorno Ven 25 Gen 2019, 00:59 Markus Vester &lt;<a hr=
ef=3D"mailto:markusvester@aol.com" target=3D"_blank" rel=3D"noreferrer">mar=
kusvester@aol.com</a>&gt; ha scritto:<br></div><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x"><div style=3D"font-size:10pt;font-family:arial,helvetica,sans-serif;colo=
r:black"><div style=3D"color:black;font-family:arial,helvetica,sans-serif;f=
ont-size:10pt">Hi Ric,<br><br>Good idea! You can check the effect on my gra=
bber: I&#39;ve injected an auxiliary carrier into the right channel of the =
topmost speclab instance, so=C2=A0the colour on your frequency indicates ph=
ase instead of azimuth.=C2=A0If you like=C2=A0you could=C2=A0temporarily in=
terrupt the=C2=A0carrier and verify that it comes back with same phase.<br>=
<br>Autodecoders are looking out=C2=A0for you and Joe, like last night.<br>=
<br>Best 73,<br>Markus<br><br>=C2=A0<br><br><br>-----Urspr=C3=BCngliche Mit=
teilung-----<br>Von: Riccardo Zoli &lt;<a href=3D"mailto:riccardozoli80@gma=
il.com" rel=3D"noreferrer noreferrer" target=3D"_blank">riccardozoli80@gmai=
l.com</a>&gt;<br>An: LF Group &lt;<a href=3D"mailto:rsgb_lf_group@blackshee=
p.org" rel=3D"noreferrer noreferrer" target=3D"_blank">rsgb_lf_group@blacks=
heep.org</a>&gt;<br>Verschickt: Do, 24. Jan. 2019 23:56<br>Betreff: LF: NEO=
-M8T and H-mixer (SDR)<br><br></div><div id=3D"m_9103078420462201490m_-7110=
579526651267176yiv4037724887"><div><div><br></div><div>LF,</div><div><br></=
div><div>I&#39;m testing a useful trick to allow a quadrature generator to =
mantain a stable and nominal phase using a GPS module NEO/LEA-M8T.</div><di=
v>Normally, an IC 74HC74 is used to generate the quadrature LO signals for =
a H-mixer (typically in a SDR &quot;Softrock style&quot;).</div><div>Clocki=
ng the IC with TP2 signal (f * 4, so 544 kHz to obtain a 136 kHz frequency =
conversion), there is a 90 deg. step phase ambiguity. Furthermore, with an =
undesiderate glitch on the reference clock signal, the phase could wrongly =
rotate.</div><div>So: resetting (clear) the two D flip-flops of the 74HC74 =
on rising edge of the 1PPS pulse,=C2=A0<span style=3D"font-family:sans-seri=
f">already reference for PC audio-card, we can keep nominal phasing which i=
s restored every second.</span></div><div><br></div><div><br></div><div><sp=
an style=3D"font-family:sans-serif" face=3D"sans-serif">All the best</span>=
</div><div><span style=3D"font-family:sans-serif" face=3D"sans-serif"><br><=
/span></div><div><span style=3D"font-family:sans-serif" face=3D"sans-serif"=
><br></span></div><div><span style=3D"font-family:sans-serif" face=3D"sans-=
serif">73 de Riccardo IW4DXW</span></div><div><span style=3D"font-family:sa=
ns-serif" face=3D"sans-serif"><br></span></div><div><span style=3D"font-fam=
ily:sans-serif"><br></span></div><div><span style=3D"font-family:sans-serif=
"><br></span></div></div></div></div></blockquote></div></div>

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