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From: =?UTF-8?Q?Wolfgang_B=c3=bcscher?= <dl4yhf@freenet.de>
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Date: Sun, 13 Dec 2015 13:33:27 +0100
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Subject: Re: LF: LF EbNaut test from JN80 on 137370
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Just to confirm (answer a bit late)..
In a file recorded by SpectraVue (the software which came along with the
SDR-IQ), with the VFO tuned to 77490 Hz, recodring DCF77 on 77500 Hz,
produces a 'positive' 10 Hz baseband frequency in the I+Q wave file
recorded by that software.
And, as expectable for "I" ~ cos(omega*t) and "Q" ~ sin(omega*t), the
phase of the signal's "I" component *leads* the "Q" component by 90
degrees. So, "all ok" with the files recorded by whatever software.
Besides that, it's advisable *not* to tune the SDR exactly to the
frequency of the EbNaut signal. Detune by a few Hz to avoid having the
"0 Hz" component (after the downconversion, either digital or analog)
inside the decoder's passband.
Now back to local EbNaut testing...
Have a nice sunday an a merry xmas season everyone,
Wolf .
Am 12.12.2015 um 13:12 schrieb Andy Talbot:
> Hit send too soon on the last one
>
> On 12 December 2015 at 12:06, Andy Talbot <andy.g4jnt@gmail.com
> <mailto:andy.g4jnt@gmail.com>> wrote:
>
> I've just added a fine tune to the PC prog to shift teh input
> frequeny by any amount specified in a text box
>
> { ipI& and ipQ& are the input samples from the receiver }
>
> LOtheta = Val(Tuning.Text) / Fsample
> LocalOsc = LocalOsc + LOtheta 'Both are normalised
> frequencies (Fsample = 1)
> LocalOsc = LocalOsc - Int(LocalOsc) 'Fractional
> part only
> theta = 2 * pi * LocalOsc
> IPData(DataPointer&, 0) = ipI& * Cos(theta) - ipQ& *
> Sin(theta) ' I
> IPData(DataPointer&, 1) = ipQ& * Cos(theta) + ipI& *
> Sin(theta) ' Q
>
> The effect of that is for any positive freqeuncy in Hz intereed into
> Tuning.text , the spectrum plot shift positive, and conversely the
> display shifts wown for any -ve value entered
>
> Andy G4JNT
>
>
>
>
> On 10 December 2015 at 20:34, Paul Nicholson
> <vlf0403@abelian.org <mailto:vlf0403@abelian.org>> wrote:
>
>
> In vlfrx-tools I use
>
> I = s(t) * cos( 2pi * Fo * t);
>
> Q = s(t) * sin( 2pi * Fo * t);
>
> where s(t) is the incoming signal and Fo is the
> local oscillator frequency. Is that right, or
> should there be a minus sign in there somewhere?
>
> If s(t) is VO1NA at 137370.00000 and I set Fo to
> 137369.9, then when I put I and Q into EbNaut, it
> needs an offset of +0.1 Hz to decode as you would
> expect with the LO being 0.1Hz on the low side.
>
> For more general mixing and frequency shift,
> to select the upper sideband of the mixer output
> I use
>
> I - j * Q
>
> is that the right way round? When I take I/Q data
> from an RTL2832 I find I have to invert Q to get the
> correct sideband, ie I + j * Q. That's the only
> independent source of I/Q signal that I have available
> to try.
>
> --
> Paul Nicholson
> --
>
>
>
>
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Just to confirm (answer a bit late)..<br>
<br>
In a file recorded by SpectraVue (the software which came along with
the SDR-IQ), with the VFO tuned to 77490 Hz, recodring DCF77 on
77500 Hz, produces a 'positive' 10 Hz baseband frequency in the I+Q
wave file recorded by that software.<br>
And, as expectable for "I" ~ cos(omega*t) and "Q" ~ sin(omega*t),
the phase of the signal's "I" component *leads* the "Q" component by
90 degrees. So, "all ok" with the files recorded by whatever
software.<br>
<br>
Besides that, it's advisable *not* to tune the SDR exactly to the
frequency of the EbNaut signal. Detune by a few Hz to avoid having
the "0 Hz" component (after the downconversion, either digital or
analog) inside the decoder's passband.<br>
<br>
Now back to local EbNaut testing...<br>
<br>
Have a nice sunday an a merry xmas season everyone,<br>
  Wolf .<br>
<br>
<br>
<div class="moz-cite-prefix">Am 12.12.2015 um 13:12 schrieb Andy
Talbot:<br>
</div>
<blockquote
cite="mid:CAA8k23R89jt5+PyfGRt-ofWHQhXneG03pRsN6TfYRKPssB9x-Q@mail.gmail.com"
type="cite">
<div dir="ltr">Hit send too soon on the last one
<div class="gmail_extra"><br>
<div class="gmail_quote">On 12 December 2015 at 12:06, Andy
Talbot <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:andy.g4jnt@gmail.com" target="_blank">andy.g4jnt@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div dir="ltr">I've just added a fine tune to the PC prog
to shift teh input frequeny by any amount specified in a
text box<br>
<div>Â Â Â Â Â Â </div>
</div>
</blockquote>
<div>Â </div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div dir="ltr">
<div>Â { Â ipI& and ipQ& are the input samples
from the receiver  }</div>
</div>
</blockquote>
<div>Â </div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div>      LOtheta = Val(Tuning.Text) / Fsample  <br>
</div>
<div>
<div>      LocalOsc = LocalOsc + LOtheta    Â
  'Both are normalised frequencies (Fsample = 1)</div>
<div>Â Â Â Â Â Â LocalOsc = LocalOsc - Int(LocalOsc) Â
  'Fractional part only</div>
<div>Â Â Â Â Â Â theta = 2 * pi * LocalOsc</div>
<div>Â Â </div>
<div>Â Â Â Â Â Â IPData(DataPointer&, 0) =
ipI& *Â Cos(theta)Â - ipQ& * Sin(theta) Â Â Â
' Â Â I</div>
<div>Â Â Â Â Â Â IPData(DataPointer&, 1) =
ipQ& *Â Cos(theta)Â + ipI& * Sin(theta) Â Â Â '
 Q</div>
</div>
<div class="gmail_extra"><br>
</div>
</div>
</blockquote>
<div>The effect of that is for any positive freqeuncy in Hz
intereed into Tuning.text , the spectrum plot shift
positive, and conversely the display shifts wown for any
-ve value entered</div>
<div><br>
</div>
<div>Andy  G4JNT</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_quote"><br>
<blockquote class="gmail_quote" style="margin:0px
0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div dir="ltr">
<div><br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 10 December 2015
at 20:34, Paul Nicholson <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:vlf0403@abelian.org"
target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:vlf0403@abelian.org">vlf0403@abelian.org</a></a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><br>
In vlfrx-tools I use<br>
<br>
 I = s(t) * cos( 2pi * Fo * t);<br>
<br>
 Q = s(t) * sin( 2pi * Fo * t);<br>
<br>
where s(t) is the incoming signal and Fo
is the<br>
local oscillator frequency.  Is that
right, or<br>
should there be a minus sign in there
somewhere?<br>
<br>
If s(t) is VO1NA at 137370.00000 and I set
Fo to<br>
137369.9, then when I put I and Q into
EbNaut, it<br>
needs an offset of +0.1 Hz to decode as
you would<br>
expect with the LO being 0.1Hz on the low
side.<br>
<br>
For more general mixing and frequency
shift,<br>
to select the upper sideband of the mixer
output<br>
I use<br>
<br>
  I - j * Q<br>
<br>
is that the right way round?  When I take
I/Q data<br>
from an RTL2832 I find I have to invert Q
to get the<br>
correct sideband, ie I + j * Q.  That's
the only<br>
independent source of I/Q signal that I
have available<br>
to try.<span class="HOEnZb"><font
color="#888888"><span><font
color="#888888"><br>
<br>
--<br>
Paul Nicholson<br>
--<br>
<br>
</font></span></font></span></blockquote>
</div>
<span class="HOEnZb"><font color="#888888"><br>
</font></span></div>
</div>
</blockquote>
</div>
<br>
</div>
</div>
</blockquote>
</div>
<br>
</div>
</div>
</blockquote>
<br>
</body>
</html>
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