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From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <15858.38665.qm@web28513.mail.ukl.yahoo.com> <AANLkTi=_gqLm9FcVvcVuNM0DX8n8q8ij3LU-vH6heMs9@mail.gmail.com> <AANLkTiny=ZVSBoq3RmQQhYyhfnaekDRxDAA8Jnpa_BkB@mail.gmail.com> <186099.35378.qm@web28511.mail.ukl.yahoo.com> <AANLkTi=uShUR7cHkH3wyzVuAwXjx=tYoY+vcd6VWE38j@mail.gmail.com> <979229.75434.qm@web28510.mail.ukl.yahoo.com>
Date: Fri, 31 Dec 2010 11:45:04 -0000
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Subject: Re: LF: VLF - G3XIZ transmitting today
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Chris
I would say the wire gauge is too fragile. I would use around 1mm wire=
plastic covered or enamelled, apart from the lower loss you need it=
to be robust.
I use 2.5mm pvc covered wire on all my antennas even the long horizont=
al runs and these survive the severe snow and frost and do not snap in=
the gales.
You do not mention balloon size but 4 should carry 1mm wire plus light=
weight marine grade anchor cord.
mal/g3kev
----- Original Message -----=20
From: Chris Osborn=20
To: rsgb_lf_group@blacksheep.org=20
Sent: Friday, December 31, 2010 11:08 AM
Subject: Re: LF: VLF - G3XIZ transmitting today
Ok Gary,
There's 50m of balloon aerial aloft now but one of the 4 ballooons=
has just burst.
It must have touched the wire.
Hopefully the others will hold out.
I think I may try heavier wire next time as 0.2 mm is very difficult=
to handle.
73 Chris XIZ
----------------------------------------------------------------------=
--------
From: Gary - G4WGT <g4wgt@tiscali.co.uk>
To: rsgb_lf_group@blacksheep.org
Sent: Fri, 31 December, 2010 10:57:06
Subject: Re: LF: VLF - G3XIZ transmitting today
Chris,
Just read the mail (1050utc) & I have adjusted my loop Rx system to=
your frequency running SpecLab at QRS600, 4.5mHz.
73,
Gary - G4WGT - IO83qo.
LF MF Grabber - Web Site - Blogspot - 9kHz Grabber
On 31 December 2010 10:07, Chris Osborn <g3xiz@yahoo.co.uk> wrote:
All noted Andy.
The aerial current is about 0.15A
The frequency is drifting slightly due to shack cooling and is now=
=20
8.971 870 kHz
I'll try the balloon aerial in about half an hour then switch to=
slow QRSS.
73 Chris XIZ
----------------------------------------------------------------------=
------
From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org
Sent: Fri, 31 December, 2010 9:43:41
Subject: Re: LF: VLF - G3XIZ transmitting today
Thinking about that -=20
Its exactly what I did with my first 73khz SLOWCW Tx prog back in=
1997. SLOWCW was generated, and a part of the 'mark' signal consist=
ed of the callsign being sent at normal CW speeds for identification.=
G3PLX could see this fast CW on his received warerfall as a definte=
reduction in carrier power.
=20
On 31 December 2010 09:39, Andy Talbot <andy.g4jnt@gmail.com> wrot=
e:
SDR-IQ is running, with a 20Hz wide waterfall looking in 0.03Hz=
FFT bin size.
It took 5 minutes for a calibration signal to show up on the scr=
een.
The paint is drying - slowly :-)0
If you want to send QRSS identifier at high speeds (relative) ,=
suggest you repeat at 10 or 15 minute regular intervals. They will=
then show up up as periodic reductions in carrier level of about 3dB=
or so.
If fact, tht just may be a suitable task for a new bit of softwa=
re or a PIC - a mixed QRSSSSSS generator
Andy
www.g4jnt.com
=20
On 31 December 2010 08:44, Chris Osborn <g3xiz@yahoo.co.uk> wrot=
e:
LF,
I shall be transmitting VLF today starting at 09.00 Z
Freq: 8.971 855 kHz (nominal but close)
Mode : Continuous carrier with occasional QRSS identifier
Aerial: Initially: 40m inverted 'L' at 10m =20
Later: balloon supported aerial at 50m
Hopefully the system will keep going as the loading coil re-wi=
nd=20
seems to have done the trick now that the varnish has dried.
73
Chris=20
G3XIZ
--=20
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Chris</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I would say the wire gauge is too fra=
gile. I would=20
use around 1mm wire plastic covered or enamelled, apart from the lower=
loss you=20
need it to be robust.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I use 2.5mm pvc covered wire on all=
my antennas=20
even the long horizontal runs and these survive the severe snow and fr=
ost and do=20
not snap in the gales.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>You do not mention balloon size but=
4 should carry=20
1mm wire plus lightweight marine grade anchor cord.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>mal/g3kev</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<BLOCKQUOTE style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-L=
EFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color:=
black"><B>From:</B>=20
<A title=3Dg3xiz@yahoo.co.uk href=3D"mailto:g3xiz@yahoo.co.uk">Chris=
Osborn</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Drsgb_lf_group@=
blacksheep.org href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_l=
f_group@blacksheep.org</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Friday, December 31, 20=
10 11:08=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: LF: VLF - G3XIZ=
transmitting=20
today</DIV>
<DIV><BR></DIV>
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial,helvetica,sans-ser=
if">
<DIV>Ok Gary,<BR><BR>There's 50m of balloon aerial aloft now but one=
of the 4=20
ballooons has just burst.<BR>It must have touched the wire.<BR>Hopef=
ully the=20
others will hold out.<BR><BR>I think I may try heavier wire next tim=
e as 0.2=20
mm is very difficult to handle.<BR><BR>73 Chris XIZ<BR></DIV>
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial,helvetica,sans-ser=
if"><BR>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: times new roman,new=
york,times,serif"><FONT face=3DTahoma size=3D2>
<HR SIZE=3D1>
<B><SPAN style=3D"FONT-WEIGHT: bold">From:</SPAN></B> Gary - G4WGT=
<<A href=3D"mailto:g4wgt@tiscali.co.uk">g4wgt@tiscali.co.uk</A=
>><BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:</SPAN></B> <A =
href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksh=
eep.org</A><BR><B><SPAN style=3D"FONT-WEIGHT: bold">Sent:</SPAN></=
B> Fri, 31 December, 2010=20
10:57:06<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B>=
Re: LF: VLF=20
- G3XIZ transmitting today<BR></FONT><BR>Chris,
<DIV><BR></DIV>
<DIV>Just read the mail (1050utc) & I have adjusted my loop Rx=
system to=20
your frequency running SpecLab at QRS600, 4.5mHz.</DIV>
<DIV><BR></DIV>
<DIV>73,
<DIV><BR></DIV>
<DIV>Gary - G4WGT - IO83qo.</DIV>
<DIV><BR></DIV>
<DIV><A href=3D"http://myweb.tiscali.co.uk/wgtaylor/grabber2.html"=
target=3D_blank rel=3Dnofollow>LF MF Grabber</A> - <A=
href=3D"http://myweb.tiscali.co.uk/wgtaylor/index.html" target=3D=
_blank rel=3Dnofollow>Web Site</A> - <A href=3D"http=
://www.g4wgt-mf2vlf.blogspot.com/" target=3D_blank rel=3Dnofollow>=
Blogspot</A> - <A href=3D"http://dl.dropbox.com/u/159901=
81/9khz.jpg" target=3D_blank rel=3Dnofollow>9kHz Grabber</A></DIV>=
</DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV><BR>
<DIV class=3Dgmail_quote>On 31 December 2010 10:07, Chris Osborn <SP=
AN dir=3Dltr><<A href=3D"mailto:g3xiz@yahoo.co.uk" target=3D_bl=
ank rel=3Dnofollow ymailto=3D"mailto:g3xiz@yahoo.co.uk">g3xiz@yaho=
o.co.uk</A>></SPAN> wrote:<BR>
<BLOCKQUOTE class=3Dgmail_quote style=3D"PADDING-LEFT: 1ex; MARG=
IN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV>
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial,helvetica,sans-s=
erif">
<DIV>All noted Andy.<BR><BR>The aerial current is about 0.15A<BR>T=
he=20
frequency is drifting slightly due to shack cooling and is now <BR=
>8.971 870=20
kHz<BR><BR>I'll try the balloon aerial in about half an hour then=
switch to=20
slow QRSS.<BR><BR>73 Chris XIZ<BR></DIV>
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial,helvetica,sans-s=
erif"><BR>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: times new roman,=
new york,times,serif"><FONT face=3DTahoma size=3D2>
<HR SIZE=3D1>
<B><SPAN style=3D"FONT-WEIGHT: bold">From:</SPAN></B> Andy Talbot=
<<A href=3D"mailto:andy.g4jnt@gmail.com" target=3D_blank rel=
=3Dnofollow ymailto=3D"mailto:andy.g4jnt@gmail.com">andy.g4jnt@g=
mail.com</A>><BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:</SP=
AN></B> <A href=3D"mailto:rsgb_lf_group@blacksheep.org" target=
=3D_blank rel=3Dnofollow ymailto=3D"mailto:rsgb_lf_group@blacksh=
eep.org">rsgb_lf_group@blacksheep.org</A><BR><B><SPAN style=3D"F=
ONT-WEIGHT: bold">Sent:</SPAN></B> Fri, 31 December, 2010=20
9:43:41<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B=
> Re: LF:=20
VLF - G3XIZ transmitting today<BR></FONT>
<DIV>
<DIV></DIV>
<DIV class=3Dh5><BR>
<DIV>Thinking about that - </DIV>
<DIV>Its exactly what I did with my first 73khz SLOWCW Tx&nbs=
p; prog=20
back in 1997. SLOWCW was generated, and a part of the=
'mark'=20
signal consisted of the callsign being sent at normal CW speeds fo=
r=20
identification. G3PLX could see this fast CW on his re=
ceived=20
warerfall as a definte reduction in carrier power.</DIV>
<DIV><BR> </DIV>
<DIV class=3Dgmail_quote>On 31 December 2010 09:39, Andy Talbot <S=
PAN dir=3Dltr><<A href=3D"mailto:andy.g4jnt@gmail.com" target=
=3D_blank rel=3Dnofollow ymailto=3D"mailto:andy.g4jnt@gmail.com"=
>andy.g4jnt@gmail.com</A>></SPAN>=20
wrote:<BR>
<BLOCKQUOTE class=3Dgmail_quote style=3D"PADDING-LEFT: 1ex;=
MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV>SDR-IQ is running, with a 20Hz wide waterfall looking in 0.=
03Hz FFT=20
bin size.</DIV>
<DIV>It took 5 minutes for a calibration signal to show up=
on the=20
screen.</DIV>
<DIV>
<DIV>The paint is drying - slowly :-)0</DIV>
<DIV> </DIV></DIV>
<DIV>If you want to send QRSS identifier at high speeds (relativ=
e) ,=20
suggest you repeat at 10 or 15 minute <U>regular</U> intervals.&=
nbsp; They=20
will then show up up as periodic reductions in carrier level of=
about 3dB=20
or so.</DIV>
<DIV> </DIV>
<DIV>If fact, tht just may be a suitable task for a new bit of=
software or=20
a PIC - a mixed QRSSSSSS generator</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>Andy</DIV>
<DIV><A href=3D"http://www.g4jnt.com/" target=3D_blank =
rel=3Dnofollow>www.g4jnt.com</A></DIV>
<DIV>
<DIV></DIV>
<DIV>
<DIV><BR><BR> </DIV>
<DIV class=3Dgmail_quote>On 31 December 2010 08:44, Chris Osborn=
<SPAN dir=3Dltr><<A href=3D"mailto:g3xiz@yahoo.co.uk" targ=
et=3D_blank rel=3Dnofollow ymailto=3D"mailto:g3xiz@yahoo.co.uk=
">g3xiz@yahoo.co.uk</A>></SPAN>=20
wrote:<BR>
<BLOCKQUOTE class=3Dgmail_quote style=3D"PADDING-LEFT:=
1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px sol=
id">
<DIV>
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial,helvetica,sa=
ns-serif">
<DIV>LF,<BR><BR>I shall be transmitting VLF today starting at=
09.00=20
Z<BR><BR>Freq: 8.971 855 kHz (nominal but=20
close)<BR>Mode : Continuous carrier with occasional QRSS=20
identifier<BR>Aerial: Initially: 40m inverted 'L'=
at=20
10m =20
<BR> &nbs=
p;=20
Later: balloon supported aerial at=20
50m<BR><BR>Hopefully the system will keep going as the loading=
coil=20
re-wind <BR>seems to have done the trick now that the varnish=
has=20
dried.<BR><BR>73<BR>Chris=20
<BR>G3XIZ<BR></DIV></DIV><BR></DIV></BLOCKQUOTE></DIV><BR></DIV>=
</DIV></BLOCKQUOTE></DIV><BR></DIV></DIV></DIV></DIV></DIV><BR></DIV><=
/BLOCKQUOTE></DIV><BR><BR clear=3Dall><BR>-- <BR>
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