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Message-ID: <819.35771.qm@web28108.mail.ukl.yahoo.com>
References: <002101cc08b2$e3cc7510$ab655f30$@h.wright@btinternet.com>
Date: Mon, 2 May 2011 17:08:39 +0100 (BST)
From: M0FMT <m0fmt@yahoo.co.uk>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <002101cc08b2$e3cc7510$ab655f30$@h.wright@btinternet.com>
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Subject: Re: LF: Winrad calibration
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Hi Ken and LF

>From my experience Winrad is not suitable for VLF reception.=A0The fact th=
at=20
Dennis M0JXM can receive Chris (G3XIZ)=A0on Winrad is that their aerials=
 nearly=20
touch (an exaggeration) but its about 1.5km separation. Dennis can read Ch=
ris=20
real time. I have looked at the 9kc/s spectrum using Winrad but I could no=
t get=20
the band spread or the level of FFT iterations to resolve a signal as weak=
 as=20
Chris'. (I am sure some one tell me I am wrong). However all is not lost,=
 Spec=20
Lab is a free down load and runs on most=A0Win OS. With Spec lab you can=
 get down=20
to=A0mHz BW and have a 1 or 2Hz total display where the doubt and uncertai=
nty are=20
removed as to what signal you are getting. Not only=A0that the frequency=
=20
calibration can be automatically locked to one of the Mil stns=A0further=
 up the=20
band.
I have spent ages trying to get a good signal from the low power VLF signa=
ls and=20
I don't think it is easy, as Eddie and Stefan and Marcus will tell you bec=
ause I=20
have bothered them about it.

Where I live there are signals many many times stronger than Chris barely=
 1/2Hz=20
away. When observe at the resolution required they appear very unstable wh=
ereas=20
Chris' signal does not. It becomes obvious what you are looking at. By the=
=20
stability standards required those very strong traces you are looking at=
 are=20
very unstable. They emanating from only a few yards away unless they can=
 be=20
identified as say a Mil stn or Line time base they are likely to be SMPSU=
 or the=20
like..

The beauty of Spec Lab is that you can use some one elses settings to get=
 pretty=20
well there. Stefan and Eddie have done a lot on this, they have hepled me=
 no=20
end. =A0So if you haven't started with Spec lab I=A0think it would be wort=
h your=20
while and drop Winrad for this application. IMHO Winrad is a great SDR=20
application and I recommend it to any one who is starting using SDR but I=
 really=20
don't think it can cut the mustard on VLF. It's Horse for Courses Ken.

73 es GL Pete M0FMT IO91UX=20




________________________________
From: Ken <ken.h.wright@btinternet.com>
To: rsgb_lf_group@blacksheep.org
Sent: Mon, 2 May, 2011 11:22:49
Subject: LF: Winrad calibration


VLF.
How can I calibrate Winrad 1.6? I am seeing a trace at 8.99kHz, not sure=
 if it=20
is Chris with Winrad requiring calibration or something else. Still seeing=
 the=20
trace at 9.96 kHz, it is coming down the antenna I can see it on the doubl=
et=20
with the E-probe psu switched off so must be a high level being just a sin=
gle=20
trace unlikely to be an SMPU?
=A0
73.
Ken
=A0
M0KHW=20

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<html><head><style type=3D"text/css"><!-- DIV {margin:0px;} --></style></h=
ead><body><div style=3D"font-family:arial, helvetica, sans-serif;font-size=
:10pt"><DIV></DIV>
<DIV>Hi Ken and LF</DIV>
<DIV>&nbsp;</DIV>
<DIV>From my experience Winrad is not suitable for VLF reception.&nbsp;The=
 fact that Dennis M0JXM can receive Chris (G3XIZ)&nbsp;on Winrad is that=
 their aerials nearly touch (an exaggeration) but its about 1.5km separati=
on. Dennis can read Chris real time. I have looked at the 9kc/s spectrum=
 using Winrad but I could not get the band spread or the level of FFT iter=
ations to resolve a signal as weak as Chris'. (I am sure some one tell me=
 I am wrong). However all is not lost, Spec Lab is a free down load and ru=
ns on most&nbsp;Win OS. With Spec lab you can get down to&nbsp;mHz BW and=
 have a 1 or 2Hz total display where the doubt and uncertainty are removed=
 as to what signal you are getting. Not only&nbsp;that the frequency calib=
ration can be automatically locked to one of the Mil stns&nbsp;further up=
 the band.</DIV>
<DIV>I have spent ages trying to get a good signal from the low power VLF=
 signals and I don't think it is easy, as Eddie and Stefan and Marcus will=
 tell you because I have bothered them about it.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Where I live there are signals many many times stronger than Chris ba=
rely 1/2Hz away. When observe at the resolution required they appear very=
 unstable whereas Chris' signal does not. It becomes obvious what you are=
 looking at. By the stability standards required those very strong traces=
 you are looking at are very unstable. They emanating from only a few yard=
s away unless they can be identified as say a Mil stn or Line time base th=
ey are likely to be SMPSU or the like..</DIV>
<DIV>&nbsp;</DIV>
<DIV>
<DIV>The beauty of Spec Lab is that you can use some one elses settings to=
 get pretty well there. Stefan and Eddie have done a lot on this, they hav=
e hepled me no end. &nbsp;So if you haven't started with Spec lab I&nbsp;t=
hink it would be worth your while and drop Winrad for this application. IM=
HO Winrad is a great SDR application and I recommend it to any one who is=
 starting using SDR but I really don't think it can cut the mustard on VLF=
. It's Horse for Courses Ken.</DIV>
<DIV>&nbsp;</DIV></DIV>
<DIV>73 es GL Pete M0FMT IO91UX </DIV>
<DIV><BR></DIV>
<DIV style=3D"FONT-FAMILY: arial, helvetica, sans-serif; FONT-SIZE: 10pt">=
<BR>
<DIV style=3D"FONT-FAMILY: times new roman, new york, times, serif; FONT-S=
IZE: 12pt"><FONT size=3D2 face=3DTahoma>
<HR SIZE=3D1>
<B><SPAN style=3D"FONT-WEIGHT: bold">From:</SPAN></B> Ken &lt;ken.h.wright=
@btinternet.com&gt;<BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:</SPAN></B>=
 rsgb_lf_group@blacksheep.org<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Sent=
:</SPAN></B> Mon, 2 May, 2011 11:22:49<BR><B><SPAN style=3D"FONT-WEIGHT:=
 bold">Subject:</SPAN></B> LF: Winrad calibration<BR></FONT><BR>
<STYLE><!--    _filtered {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2=
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STYLE>

<DIV class=3DWordSection1>
<P class=3DMsoNormal>VLF.</P>
<P class=3DMsoNormal>How can I calibrate Winrad 1.6? I am seeing a trace=
 at 8.99kHz, not sure if it is Chris with Winrad requiring calibration or=
 something else. Still seeing the trace at 9.96 kHz, it is coming down the=
 antenna I can see it on the doublet with the E-probe psu switched off so=
 must be a high level being just a single trace unlikely to be an SMPU?</P=
>
<P class=3DMsoNormal>&nbsp;</P>
<P class=3DMsoNormal>73.</P>
<P class=3DMsoNormal>Ken</P>
<P class=3DMsoNormal>&nbsp;</P>
<P class=3DMsoNormal>M0KHW <SPAN style=3D"FONT-SIZE: 12pt"></SPAN></P></DI=
V></DIV></DIV></div></body></html>

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