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From: Andy Talbot <andy.g4jnt@gmail.com>
Date: Mon, 24 Oct 2016 21:22:32 +0100
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To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part2
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Won't the sound card's input filter, the anti-alias filter, extend this
pulse, however short it is, into something the sampling rate will always
see?  So there is no need to deliberately lenghen it.

The only real advantage to doing so, perhaps, would be to increase the
pulse energy within a one sample period leading to a hight amplitude in the
capture.

The 1 PPS from my HP-5061 is only 1us in width, but can still be detected
on a soundcard stream at any sampling rate chosen.

Andy  G4JNT


On 24 October 2016 at 21:07, Wolfgang B=C3=BCscher <dl4yhf@freenet.de> wrot=
e:

> Hello Jim,
>
> I still wonder why the sync pulses from the Thunderbolt E are so short -
> you mentioned 10 us in your email, but what is the exact pulse length ?
> With a slightly modified software (SL) it may be possible to use them as
> they are.. if they are longer than a sample from the soundcard.
>
> 73,
>    Wolf DL4YHF
>   (not QRV on LF+MF unfortunately..)
>

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<div dir=3D"ltr">Won&#39;t the sound card&#39;s input filter, the anti-alia=
s filter, extend this pulse, however short it is, into something the sampli=
ng rate will always see?=C2=A0 So there is no need to deliberately lenghen =
it. =C2=A0<div><br></div><div>The only real advantage to doing so, perhaps,=
 would be to increase the pulse energy within a one sample period leading t=
o a hight amplitude in the capture.</div><div><br></div><div>The 1 PPS from=
 my HP-5061 is only 1us in width, but can still be detected on a soundcard =
stream at any sampling rate chosen.</div><div><br></div><div>Andy =C2=A0G4J=
NT</div><div><br></div><div class=3D"gmail_extra"><br><div class=3D"gmail_q=
uote">On 24 October 2016 at 21:07, Wolfgang B=C3=BCscher <span dir=3D"ltr">=
&lt;<a href=3D"mailto:dl4yhf@freenet.de" target=3D"_blank">dl4yhf@freenet.d=
e</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margi=
n:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" text=3D"#000000">
    Hello Jim,<br>
    <br>
    I still wonder why the sync pulses from the Thunderbolt E are so
    short - you mentioned 10 us in your email, but what is the exact
    pulse length ? With a slightly modified software (SL) it may be
    possible to use them as they are.. if they are longer than a sample
    from the soundcard.<br>
    <br>
    73,<br>
    =C2=A0=C2=A0 Wolf DL4YHF <br>
    =C2=A0 (not QRV on LF+MF unfortunately..)<br></div></blockquote></div><=
/div></div>

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