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Subject: Re: VLF: Software PSK modulation
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----------MB_8D32429FE7DA31B_1A7C_C516AB_webmail-vm003.sysops.aol.com
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=20=20=20=20=20Hi=20Domenico,=0D=0A=20=20=C2=A0=0D=0A=20=20thanks=20for=20the=20=
VLF=20screen=20grabs!=0D=0A=C2=A0=0D=0AI=20have=20uploaded=20my=20current=20VLF-=
grabber=20SpecLab=20settings:=20=0D=0A=20=20http://df6nm.bplaced.net/VLF/vlfgrab=
ber_settings_160119.zip=0D=0A=20=20=20=0D=0ABeware=20though=20that=C2=A0several=20=
settings=20may=C2=A0a=20bit=20peculiar:=20=0D=0A=C2=A0=0D=0A=0D=0A=20=20The=20op=
ds/EbNaut=20saves=C2=A0have=20been=20included=20only=20in=20the=20"60000"=20inst=
ance,=20writing=20into=C2=A0a=20spectrum\data4H=C2=A0folder.=20In=20my=20case,=20=
parameters=20for=20sr.txt=20would=C2=A0be=C2=A0=0D=0A=20=2032000.15=C2=A031104=20=
16384=208270=0D=0A=20=20(ADC=20samplerate,=20decimation,=20FFT=20length,=20cente=
r=20frequency).=20The=20observed=20frequency=20range=20after=20decimation=20is=20=
only=20+-0.25=20Hz.=0D=0A=20=20=C2=A0=0D=0ATo=20save=20some=20CPU,=20the=20narro=
wband=20instances=20are=20running=20only=C2=A0at=2032=20ks/s=20samplerate.=20=0D=
=0A=C2=A0=0D=0AI=20am=20using=20a=20cheap=20"3D-sound"=20mono-input=20dongle,=C2=
=A0so=20a=20strong=C2=A0and=20clean=201pps=20pulse=C2=A0needs=20to=20be=C2=A0add=
ed=20on=C2=A0top=20of=20the=C2=A0RX=20antenna=20signal.=20After=20filtering=C2=A0=
(either=20DC-reject=20with=20a=20very=20short=20time=20constant,=20or=20bandpass=
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e=20blanker.=0D=0A=C2=A0=0D=0AIn=20the=2060000=20instance,=20the=20delay-line=20=
bypass=20factor=C2=A0(100)=20is=20used=20for=20extra=20gain,=C2=A0allowing=20mor=
e=20compact=20integer-number=20FFT=20data=20export.=C2=A0=C2=A0=0D=0A=20=20=C2=A0=
=0D=0A=20=20You=20will=20probably=20not=20need=20the=C2=A0FFT=20autonotch=20filt=
er.=C2=A0I=20have=20inserted=C2=A0it=20hoping=20to=C2=A0remove=C2=A0wandering=20=
33=20Hz=20harmonics=20from=20the=20nearby=20railway,=20without=20taking=20out=20=
too=20much=20of=20the=20signal.=20It=20seemed=20to=20do=20some=20good,=20but=20I=
=20still=20find=20that=20my=20SNR=20for=20Uwe=20seems=20to=20be=C2=A0around=206=20=
to=2010=20dB=20worse=20than=20on=20the=20DK7FC=20and=20OK2BVG=20grabbers.=C2=A0S=
o=20far=C2=A0I=20have=20not=20yet=20been=20able=20to=C2=A0decode=20a=20VLF=C2=A0=
EbNaut=20signal.=0D=0A=20=20=C2=A0=0D=0A=20=20The=20wideband=20instance=20calls=20=
a=C2=A0batch=20file=20for=20IrfanView=20png=C2=A0conversion,=20Dropbox=20upload=20=
and=20daily=20saves,=20a=20procedure=20you=20may=C2=A0want=20to=20adapt=20as=20w=
ell.=0D=0A=20=20=C2=A0=0D=0A=20=20All=20the=20best,=0D=0AMarkus=20(DF6NM)=0D=0A=20=
=20=0D=0A=20=C2=A0=0D=0A=20-----Urspr=C3=BCngliche=20Mitteilung-----=20=0D=0A=20=
Von:=20IZ7SLZ=20&lt;iz7slz.domenico@gmail.com&gt;=0D=0A=20An:=20rsgb_lf_group=20=
&lt;rsgb_lf_group@blacksheep.org&gt;=0D=0A=20Verschickt:=20Sa,=2023=20Jan=202016=
=207:18=20pm=0D=0A=20Betreff:=20Re:=20VLF:=20Software=20PSK=20modulation=0D=0A=20=
=0D=0A=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
Hello=20Markus,=0D=0A=20=20=20=20=20=20=20=20=0D=0A=20=20=20=20=20=20=20=20many=20=
thanks=20for=20sharing=20details=20of=20your=20very=20interesting=20=20=20=20=20=
=20=20experiment.=20As=20you=20known,=C2=A0=20i=20have=20used=20your=20PLL=20met=
hod=20in=20my=20=20=20=20=20=20=20LF-EbNaut=20setup=20to=20generate=20a=20quite=20=
steady=C2=A0=20modulating=20audio=20tone.=20=20=20=20=20=20=20But=20in=20my=20ca=
se,=20the=20feedback=20is=20taken=20at=20the=20output=20of=20the=20sound=20=20=20=
=20=20=20=20card=20before=20the=20ring-modulator=20that=20acts=20the=20bpsk.=0D=0A=
=20=20=20=20=20=20=20=20If=20i=20have=20understood,=20you=20have=20now=20overcom=
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to=20cancels=20the=20psk=20modulation.=20That's=20good.=20I=20=20=20=20=20=20=20=
will=20try=20it=20in=20my=20next=20VLF=20local=20transmissions.=0D=0A=20=20=20=20=
=20=20=20=20=0D=0A=20=20=20=20=20=20=20=20Since=20two=20days,=20i'm=20running=20=
a=20(temporarily=20!)=20VLF=20receiver/grabber=20=20=20=20=20=20=20with=20a=20re=
solution=20of=2063=20uHz:=0D=0A=20=20=20=20=20=20=20=20=0D=0A=20=20=20=20=20=20=20=
=20https://www.dropbox.com/s/fsjkfuhggozzv5w/grabber.jpg?dl=3D0=0D=0A=20=20=20=20=
=20=20=20=20=0D=0A=20=20=20=20=20=20=20=20Unfortunatly=20no=20signals=20on=20"dr=
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=20=20=20=20improve=20reception=20trying=20to=20relocate=20the=20mini-whip.=20Ne=
xt=20step=20will=20=20=20=20=20=20=20be=20to=20test=20a=20Loop=20antenna.=20By=20=
the=20way,=20the=20chances=20to=20pick=20up=20a=20=20=20=20=20=20=20VLF=20"dream=
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=20=20=20=20=20station=20in=20JN80=20that=20is=20"urban-located"=20and=20fairly=20=
far=20from=20you.=0D=0A=20=20=20=20=20=20=20=20=0D=0A=20=20=20=20=20=20=20=20I=20=
want=20to=20try=20to=20record=20and=20decode=20my=20local=20EbNaut=20signals=20o=
n=20VLF.=20=20=20=20=20=20=20I=20made=20some=20reception=20test=20using=20Wolf's=
=20beta=20version=20that=20includes=20=20=20=20=20=20=20EbNaut=20facilities.=20I=
=20have=20succesfully=20tested=20it=20on=20MF=20during=20some=20=20=20=20=20=20=20=
test=20transmissions=20of=20IW4DXW.=20But=20i=20want=20test=20also=20your=20reco=
rding=20=20=20=20=20=20=20method=20that=20uses=20the=20FFT=20export=20file=20fun=
ction=20of=20Spectrum=20Lab.=0D=0A=20=20=20=20=20=20=20=20Taking=20in=20consider=
ation=20that=20i'm=20using=2048000=20sample/s=20can=20you=20=20=20=20=20=20=20su=
ggest=20the=20correct=20parameters=20needed=20for=20SL=20and=20for=20the=20sr.tx=
t=20=20=20=20=20=20=20file=20used=20for=20the=20inverse-FFT=20program=20?=0D=0A=20=
=20=20=20=20=20=20=20=0D=0A=20=20=20=20=20=20=20=20Maybe=20someone=20else=20is=20=
interested=20at=20this=20method.=0D=0A=20=20=20=20=20=20=20=20=0D=0A=20=20=20=20=
=20=20=20=20Thanks=20in=20advance.=0D=0A=20=20=20=20=20=20=20=20=0D=0A=20=20=20=20=
=20=20=20=2073=20and=20good=20week-end=20to=20all=20group=0D=0A=20=20=20=20=20=20=
=20=20=0D=0A=20=20=20=20=20=20=20=20Domenico=20/=20iz7slz=0D=0A=0D=0A=0D=0A=C2=A0=
=C2=A0=C2=A0=20=0D=0A=0D=0A=20=20=20=20=0D=0A=20=20=20=20=0D=0A=20=20=0A=0A
----------MB_8D32429FE7DA31B_1A7C_C516AB_webmail-vm003.sysops.aol.com
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=20=20=0D=0A<div=20id=3D"AOLMsgPart_1_40503ed0-0d2d-425f-b3f9-e2361c90b948">=20=20=
=20=0D=0A<div=20style=3D"color:=20black;=20font-family:=20arial;=20font-size:=20=
10pt;"><font=20color=3D"black"=20face=3D"arial">Hi=20Domenico,</font></div>=0D=0A=
=20=20=0D=0A<div=20style=3D"color:=20black;=20font-family:=20arial;=20font-size:=
=2010pt;">&nbsp;</div>=0D=0A=20=20=0D=0A<div=20style=3D"color:=20black;=20font-f=
amily:=20arial;=20font-size:=2010pt;">thanks=20for=20the=20VLF=20screen=20grabs!=
</div>=0D=0A=0D=0A<div=20style=3D"color:=20black;=20font-family:=20arial;=20font=
-size:=2010pt;">&nbsp;</div>=0D=0A=0D=0A<div=20style=3D"color:=20black;=20font-f=
amily:=20arial;=20font-size:=2010pt;">I=20have=20uploaded=20my=20current=20VLF-g=
rabber=20SpecLab=20settings:=20</div>=0D=0A=20=20=0D=0A<div=20style=3D"color:=20=
black;=20font-family:=20arial;=20font-size:=2010pt;"><a=20href=3D"http://df6nm.b=
placed.net/VLF/vlfgrabber_settings_160119.zip">http://df6nm.bplaced.net/VLF/vlfg=
rabber_settings_160119.zip</a><span=20style=3D"display:=20inline-block;"=20conte=
nteditable=3D"false"></span></div>=0D=0A=20=20=0D=0A<div>=20</div>=0D=0A=0D=0A<d=
iv>=0D=0A<div>Beware=20though=20that&nbsp;several=20settings=20may&nbsp;a=20bit=20=
peculiar:=20</div>=0D=0A=0D=0A<div>&nbsp;</div>=0D=0A</div>=0D=0A=20=20=0D=0A<di=
v>The=20opds/EbNaut=20saves&nbsp;have=20been=20included=20only=20in=20the=20"600=
00"=20instance,=20writing=20into&nbsp;a=20spectrum\data4H&nbsp;folder.=20In=20my=
=20case,=20parameters=20for=20sr.txt=20would&nbsp;be&nbsp;</div>=0D=0A=20=20=0D=0A=
<div>32000.15&nbsp;31104=2016384=208270</div>=0D=0A=20=20=0D=0A<div>(ADC=20sampl=
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=0D=0A<div>&nbsp;</div>=0D=0A=0D=0A<div>To=20save=20some=20CPU,=20the=20narrowba=
nd=20instances=20are=20running=20only&nbsp;at=2032=20ks/s=20samplerate.=20</div>=
=0D=0A=0D=0A<div>&nbsp;</div>=0D=0A=0D=0A<div>I=20am=20using=20a=20cheap=20"3D-s=
ound"=20mono-input=20dongle,&nbsp;so=20a=20strong&nbsp;and=20clean=201pps=20puls=
e&nbsp;needs=20to=20be&nbsp;added=20on&nbsp;top=20of=20the&nbsp;RX=20antenna=20s=
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time=20constant,=20or=20bandpass),=20the=20pps=20pulse=20edges=20are&nbsp;comple=
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=0A=0D=0A<div>In=20the=2060000=20instance,=20the=20delay-line=20bypass=20factor&=
nbsp;(100)=20is=20used=20for=20extra=20gain,&nbsp;allowing=20more=20compact=20in=
teger-number=20FFT=20data=20export.&nbsp;&nbsp;</div>=0D=0A=20=20=0D=0A<div>&nbs=
p;</div>=0D=0A=20=20=0D=0A<div>You=20will=20probably=20not=20need=20the&nbsp;FFT=
=20autonotch=20filter.&nbsp;I=20have=20inserted&nbsp;it=20hoping=20to&nbsp;remov=
e&nbsp;wandering=2033=20Hz=20harmonics=20from=20the=20nearby=20railway,=20withou=
t=20taking=20out=20too=20much=20of=20the=20signal.=20It=20seemed=20to=20do=20som=
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be&nbsp;around=206=20to=2010=20dB=20worse=20than=20on=20the=20DK7FC=20and=20OK2B=
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r=20IrfanView=20png&nbsp;conversion,=20Dropbox=20upload=20and=20daily=20saves,=20=
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iv>Markus=20(DF6NM)</div>=0D=0A=20=20=0D=0A<div><br>=0D=0A=20&nbsp;</div>=0D=0A=20=
-----Urspr=C3=BCngliche=20Mitteilung-----=20<br>=0D=0A=20Von:=20IZ7SLZ=20&lt;iz7=
slz.domenico@gmail.com&gt;<br>=0D=0A=20An:=20rsgb_lf_group=20&lt;rsgb_lf_group@b=
lacksheep.org&gt;<br>=0D=0A=20Verschickt:=20Sa,=2023=20Jan=202016=207:18=20pm<br=
>=0D=0A=20Betreff:=20Re:=20VLF:=20Software=20PSK=20modulation<br>=0D=0A=20<br>=0D=
=0A=20=20=20=0D=0A<div=20id=3D"AOLMsgPart_1_246f4d51-6588-484c-9157-713950bb0ee5=
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class=3D"aolmail_moz-cite-prefix">Hello=20Markus,<br>=0D=0A=20=20=20=20=20=20=20=
=20<br>=0D=0A=20=20=20=20=20=20=20=20many=20thanks=20for=20sharing=20details=20o=
f=20your=20very=20interesting=20=20=20=20=20=20=20experiment.=20As=20you=20known=
,&nbsp;=20i=20have=20used=20your=20PLL=20method=20in=20my=20=20=20=20=20=20=20LF=
-EbNaut=20setup=20to=20generate=20a=20quite=20steady&nbsp;=20modulating=20audio=20=
tone.=20=20=20=20=20=20=20But=20in=20my=20case,=20the=20feedback=20is=20taken=20=
at=20the=20output=20of=20the=20sound=20=20=20=20=20=20=20card=20before=20the=20r=
ing-modulator=20that=20acts=20the=20bpsk.<br>=0D=0A=20=20=20=20=20=20=20=20If=20=
i=20have=20understood,=20you=20have=20now=20overcome=20the=20initial=20problem=20=
of=20=20=20=20=20=20=20this=20PLL=20that=20tends=20to=20cancels=20the=20psk=20mo=
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