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From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <F5E3833FE6F34CD188FAD031556B9682@White> <4CDE81B2.10609@iup.uni-heidelberg.de> <4CDE898B.8090604@iup.uni-heidelberg.de> <1D64BDBD8B0F4F14A399EBC253B515B8@White> <202187DBCDDD476B846782F3607D34B8@White> <DAE5EA13FA2D4B4EA6CCADB0E50355DC@White>
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Subject: Re: VLF: TX on 6.47 and 8.97
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Markus
There was another carrier visible at my qth. This carrier was visible=
after you switched off but it also went qrt around 1340, the frequenc=
y was 8970 kcs but not calibrated at my end so could be a little out.=
Maybe this carrier was seen by F1AFJ if it is not your transmission.=
=20
I wonder if anyone else in the UK detected any signals
Gl with your experiments.
de mal/g3kev
----- Original Message -----=20
From: Markus Vester=20
To: rsgb_lf_group@blacksheep.org=20
Cc: Paul=20
Sent: Saturday, November 13, 2010 10:04 PM
Subject: Re: VLF: TX on 6.47 and 8.97
Dear LF, Paul,
here's a short summary of today's VLF kite transmission. I'm sorry=
for the late notice, but the experiment had not been planned ahead,=
and I wasn't sure if I could get on at all. Also, the kite I am using=
(a 0.8 m^2 delta toy bought for 4.99 Euro) is a bit small for this so=
rt of activity, and really requires a good and steady wind. =20
The QTH was actually at 49.3874 N 11.1692 E, a few 100 meters from=
the former location reported earlier. The GPS-controlled carriers wer=
e on air=20
11:15 - 12:15 6470.000 Hz ~ 50 uW, and=20
12:30 - 13:10 8970.002 Hz ~ 200 uW (EMRP).
Getting on 6470 was easier than expected. I simply used the same "se=
ven-bucket" coil, which resonates my 240 pF home antenna to 8.97 kHz.=
Connected to the kite wire, the resonance was close enough to 6.5 kHz=
to be tuned by the ferrite plate variometer. Then the drive for the=
audio amp was increased until the onset of corona sizzling at 0.25 A.=
At that point, the amp drew 10 A DC from the car battery and probably=
delivered around 50 W. After connecting mobile internet and staring=
at Stefan's grabber, I was positively surprised to find a faint trace=
there!
For the frequency change, I removed the two bottom coil buckets, whi=
ch brought the resonance to ~ 8.5 kHz. Then I had to carefully pull th=
e remaining 5 buckets apart, inserting bits of plastic foam material=
as spacers. Going through a few iterations took about 10 minutes, and=
I got to "full power" (380 mA, 100W) at 12:30. Unfortunately, the win=
d had started to calm by then, and there were several dips during this=
transmission. Finally at 13:10, the kite landed gently in the grass,=
and I decided to close down and pack up early.
Traces from both transmissions were visible on DK7FC's 4.5 mHz "600"=
windows, and the second one also produced a nice dash on the 0.45 mHz=
window. It is likely that these signals would be useful for a kite-to=
-kite QSO on either frequency, using 10 minute dashes.
The screenshot from F1AFJ has an interesting dash before 13:00. The=
indicated frequency seems a bit high (8970.020 instead of 8970.002),=
which could perhaps be due to a small samplerate calibration error.=
I am also not sure about the time scale - judging by the width of th=
e noise blobs, the setting could have been 11 mHz and 10 seconds per=
pixel. It would be nice if Jean-Pierre could confirm the frequency ca=
libration and scroll settings.
I also carefully inspected the OE3GHB grabber, which runs at 1.4 mHz=
resolution and seems to be very sensitive. It showed an unusually dar=
k period of very low noise between 8 and 11 UT today. But no luck for=
my transmission there yet.
Well, in addition to the technical aspects, being outdoors in the wa=
rm wind was again a rewarding and enjoyable experience.=20
Best 73, and thanks again for the interest.=20
Markus (DF6NM)
From: Markus Vester=20
Sent: Saturday, November 13, 2010 2:19 PM
To: rsgb_lf_group@blacksheep.org=20
Subject: Re: VLF: TX on 6.47 and 8.97 - QRT
Sorry folks, I had to shut down at 13:10 due to lack of wind. Many=
thanks for looking!
Best 73,
Markus (DF6NM)
From: Markus Vester=20
Sent: Saturday, November 13, 2010 2:08 PM
To: rsgb_lf_group@blacksheep.org=20
Subject: Re: VLF: TX on 6.47 and 8.97
Hi Stefan, thanks for the observation! I am approximately at 49.3851=
N 11.1727 E. After a bit of fiddling with the coil, the carrier is on=
8970.002 since about 12:25. I will try to stay on till 14:00, but the=
re are a few lows as the wind has calmed down a bit.
73, Markus
From: Stefan Sch=E4fer=20
Sent: Saturday, November 13, 2010 1:50 PM
To: rsgb_lf_group@blacksheep.org=20
Subject: Re: VLF: TX on 6.47 and 8.97
There is a trace now coming up slightly above 8970 Hz in the DFCW-60=
0 window :-)
Markus, what is your exact locator? http://no.nonsense.ee/qthmap/ =
Let us see where you are currently :-)
73, Stefan
Am 13.11.2010 13:16, schrieb Stefan Sch=E4fer:=20
Wow! Hi Markus,
Good luck!! Yes, the wind is very strong indeed. For my kites it=
is almost to strong...
With your kite you should easily be visible in the 6000er window=
on 8970.
OOOH! I just looked on my 2nd VLF grabber http://www.iup.uni-heide=
lberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html and saw your trace in DF=
CW-600!=20
Congratulations Markus!!!! This is the second amateur radio statio=
n at all who reaches the far field within the 46km band :-) i estimate=
8 dB S/N maybe 10. Great!!!
So DFCW-600 on 8970 should be no problem later :-))
Who else of the group is monitoring? It would strongly interest ho=
w Markus is received at other locations :-)=20
Best 73 and wish FUN!!
Stefan/DK7FC
Am 13.11.2010 12:54, schrieb Markus Vester:=20
Nice wind here in Nuernberg, and I'm back on the /p QTH with my=
small kite (100m wire, kite currently about 60m up). Since 11:15 I am=
sending a carrier on 6470.00, trying to generate a small peak on DK7F=
C's second grabber. Max current into the thin wire is about 0.25 A. Af=
ter one hour at 12:15, I intend to switch to 8970.002 Hz, where I can=
radiate about 0.2 mW at 0.4 A.
Best 73,
Markus (DF6NM)
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-1>
<META content=3D"MSHTML 6.00.2600.0" name=3DGENERATOR>
<STYLE></STYLE>
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<BODY id=3DMailContainerBody style=3D"PADDING-RIGHT: 10px; PADDING-L=
EFT: 10px; PADDING-TOP: 15px" text=3D#000000 bgColor=3D#ffffff leftM=
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=3D"true">
<DIV><FONT face=3DArial size=3D2>Markus</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>There was another carrier visible at=
my qth. This=20
carrier was visible after you switched off but it also went qrt around=
1340, the=20
frequency was 8970 kcs but not calibrated at my end so could be a litt=
le out.=20
Maybe this carrier was seen by F1AFJ if it is not your transmission.=
=20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I wonder if anyone else in the UK det=
ected any=20
signals</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Gl with your experiments.</FONT></DIV=
>
<DIV><FONT face=3DArial size=3D2>de mal/g3kev</FONT></DIV>
<DIV> </DIV>
<BLOCKQUOTE dir=3Dltr style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px=
; MARGIN-LEFT: 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=3Dmarkusvester@aol.com href=3D"mailto:markusvester@aol.com"=
>Markus=20
Vester</A> </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>Cc:</B> <A title=3Dpaul@abelian.n=
etcom.co.uk href=3D"mailto:paul@abelian.netcom.co.uk">Paul</A> </D=
IV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, November 13,=
2010 10:04=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: VLF: TX on 6.47=
and=20
8.97</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>Dear LF, Paul,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>here's a short summary of today's=
VLF kite=20
transmission. I'm sorry for the late notice, but the experiment=
=20
had not been planned ahead, and I wasn't sure if I could=
get on at=20
all. Also, the kite I am using (a 0.8 m^2 delta toy bought=
=20
for 4.99 Euro) is a bit small for this sort of activity,=
and really=20
requires a good and steady wind. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>The QTH was actually at 49.3874 N=
11.1692 E, a=20
few 100 meters from the former location reported earlier. The GPS-co=
ntrolled=20
carriers were on air </FONT></DIV>
<DIV><FONT face=3DArial size=3D2> 11:15 - 12:15 6470.000=
Hz ~ 50 uW,=20
and </FONT></DIV>
<DIV><FONT face=3DArial size=3D2> 12:30 - 13:10 8970.002=
Hz ~ 200 uW=20
(EMRP).</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Getting on 6470 was easier than exp=
ected. I=20
simply used the same "seven-bucket" coil, which resonates my 240 pF=
home=20
antenna to 8.97 kHz. Connected to the kite wire, the resonance was=
close=20
enough to 6.5 kHz to be tuned by the ferrite plate variometer. =
Then=20
the drive for the audio amp was increased until the onset=
of corona=20
sizzling at 0.25 A. At that point, the amp drew 10 A DC fr=
om the car=20
battery and probably delivered around 50 W. After connecting mobile=
internet=20
and staring at Stefan's grabber, I was positively surprised to =
find a=20
faint trace there!</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>For the frequency change, I removed=
the two=20
bottom coil buckets, which brought the resonance to ~ 8.5 kHz. Then=
I had to=20
carefully pull the remaining 5 buckets apart, inserting bits of=
plastic=20
foam material as spacers. Going through a f=
ew=20
iterations took about 10 minutes, and I got to "full power" (38=
0 mA,=20
100W) at 12:30. Unfortunately, the wind had started to calm by then,=
and there=20
were several dips during this transmission. Finally at 13:10, the ki=
te landed=20
gently in the grass, and I decided to close down and pack up=20
early.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Traces from both transmissions were=
visible on=20
DK7FC's 4.5 mHz "600" windows, and the second one also produced=
=20
a nice dash on the 0.45 mHz window. It is likely that these sig=
nals would=20
be useful for a kite-to-kite QSO on either frequency, using 10 minut=
e=20
dashes.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>The screenshot from F1AFJ =
;has an=20
interesting dash before 13:00. The indicated frequency seems a=
bit high=20
(8970.020 instead of 8970.002), which could perhaps be due to a smal=
l=20
samplerate calibration error. I am also not sure about the time=20
scale - judging by the width of the noise blobs, the sett=
ing could=20
have been 11 mHz and 10 seconds per pixel. It would be nice=20
if Jean-Pierre could confirm the frequency calibration and=
scroll=20
settings.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I also carefully inspected the OE3G=
HB grabber,=20
which runs at 1.4 mHz resolution and seems to be very sensitive=
. It=20
showed an unusually dark period of very low noise between 8 and=
11 UT=20
today. But no luck for my transmission there yet.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV style=3D"FONT: 10pt Tahoma"><FONT face=3DArial>Well, in additio=
n to the=20
technical aspects, being outdoors in the warm wind was again a =
rewarding=20
and enjoyable experience. </FONT></DIV>
<DIV style=3D"FONT: 10pt Tahoma"><FONT face=3DArial></FONT> </D=
IV>
<DIV style=3D"FONT: 10pt Tahoma"><FONT face=3DArial>Best 73, and t<F=
ONT face=3DArial>hanks again for the interest. </FONT></FONT></DIV=
>
<DIV style=3D"FONT: 10pt Tahoma"><FONT face=3DArial></FONT> </D=
IV>
<DIV style=3D"FONT: 10pt Tahoma"><FONT face=3DArial>Markus (DF6NM)</=
FONT></DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV><FONT face=3DArial></FONT><FONT face=3DArial></FONT><FONT =
face=3DArial></FONT><FONT face=3DArial></FONT><FONT face=3DArial></FO=
NT><FONT face=3DArial></FONT><FONT face=3DArial></FONT><FONT face=
=3DArial></FONT><FONT face=3DArial></FONT><FONT face=3DArial></FON=
T><FONT face=3DArial></FONT><FONT face=3DArial></FONT><FONT face=
=3DArial></FONT><FONT face=3DArial></FONT><FONT face=3DArial></FON=
T><FONT face=3DArial></FONT><FONT face=3DArial></FONT><FONT face=
=3DArial></FONT><FONT face=3DArial></FONT><FONT face=3DArial></FONT><F=
ONT face=3DArial></FONT><BR></DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A title=3Dmarkusveste=
r@aol.com href=3D"mailto:markusvester@aol.com">Markus Vester</A>=
</DIV>
<DIV><B>Sent:</B> Saturday, November 13, 2010 2:19 PM</DIV>
<DIV><B>To:</B> <A title=3Drsgb_lf_group@blacksheep.org href=3D"=
mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</A>=
=20
</DIV>
<DIV><B>Subject:</B> Re: VLF: TX on 6.47 and 8.97 - QRT</DIV></DIV><=
/DIV>
<DIV><FONT face=3DArial size=3D2></FONT><FONT face=3DArial size=3D2>=
</FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial size=
=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DA=
rial size=3D2></FONT><FONT face=3DArial size=3D2></FONT><BR></DIV>
<DIV><FONT face=3DArial size=3D2>Sorry folks, I had to shut down at=
13:10 due to=20
lack of wind. Many thanks for looking!</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Best 73,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Markus (DF6NM)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV><FONT face=3DArial></FONT><FONT face=3DArial></FONT><FONT =
face=3DArial></FONT><FONT face=3DArial></FONT><FONT face=3DArial></FO=
NT><FONT face=3DArial></FONT><FONT face=3DArial></FONT><BR></DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A title=3Dmarkusveste=
r@aol.com href=3D"mailto:markusvester@aol.com">Markus Vester</A>=
</DIV>
<DIV><B>Sent:</B> Saturday, November 13, 2010 2:08 PM</DIV>
<DIV><B>To:</B> <A title=3D"mailto:rsgb_lf_group@blacksheep.org&=
#10;STRG + Klicken, um Verkn=FCpfung zu folgen" href=3D"mailto:rsg=
b_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</A>=20
</DIV>
<DIV><B>Subject:</B> Re: VLF: TX on 6.47 and 8.97</DIV></DIV></DIV>
<DIV><FONT face=3DArial size=3D2></FONT><FONT face=3DArial size=3D2>=
</FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial size=
=3D2></FONT><BR></DIV>
<DIV><FONT face=3DArial size=3D2>Hi Stefan, thanks for the observati=
on! I am=20
approximately at 49.3851 N 11.1727 E. After a bit of fiddling with=
the coil,=20
the carrier is on 8970.002 since about 12:25. I will try to stay on=
till=20
14:00, but there are a few lows as the wind has calmed down a=20
bit.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>73, Markus</FONT></DIV>
<DIV> </DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV><FONT face=3DArial></FONT><FONT face=3DArial></FONT><FONT =
face=3DArial></FONT><FONT face=3DArial></FONT><FONT face=3DArial></FO=
NT><FONT face=3DArial></FONT><FONT face=3DArial></FONT><BR></DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A title=3Dschaefe=
r@iup.uni-heidelberg.de href=3D"mailto:schaefer@iup.uni-heidelberg=
.de">Stefan Sch=E4fer</A> </DIV>
<DIV><B>Sent:</B> Saturday, November 13, 2010 1:50 PM</DIV>
<DIV><B>To:</B> <A title=3Drsgb_lf_group@blacksheep.org href=3D"=
mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</A>=
=20
</DIV>
<DIV><B>Subject:</B> Re: VLF: TX on 6.47 and 8.97</DIV></DIV></DIV>
<DIV><FONT face=3DArial size=3D2></FONT><FONT face=3DArial size=3D2>=
</FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial size=
=3D2></FONT><FONT face=3DArial size=3D2></FONT><BR></DIV>There is=
a trace now coming up slightly above 8970 Hz=20
in the DFCW-600 window :-)<BR><BR>Markus, what is your exact locator=
? <A class=3Dmoz-txt-link-freetext href=3D"http://no.nonsense.=
ee/qthmap/">http://no.nonsense.ee/qthmap/</A> =20
Let us see where you are currently :-)<BR><BR>73, Stefan<BR><BR>Am=
13.11.2010=20
13:16, schrieb Stefan Sch=E4fer:=20
<BLOCKQUOTE cite=3Dmid:4CDE81B2.10609@iup.uni-heidelberg.de type=3D"=
cite">Wow!=20
Hi Markus,<BR><BR>Good luck!! Yes, the wind is very strong indeed.=
For my=20
kites it is almost to strong...<BR>With your kite you should easil=
y be=20
visible in the 6000er window on 8970.<BR><BR>OOOH! I just looked=
on my 2nd=20
VLF grabber <A class=3Dmoz-txt-link-freetext href=3D"http://=
www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html" =
moz-do-not-send=3D"true">http://www.iup.uni-heidelberg.de/schaefer_v=
lf/DK7FC_VLF_Grabber2.html</A>=20
and saw your trace in DFCW-600! <BR>Congratulations Markus!!!! Thi=
s is the=20
second amateur radio station at all who reaches the far field with=
in the=20
46km band :-) i estimate 8 dB S/N maybe 10. Great!!!<BR><BR>So DFC=
W-600 on=20
8970 should be no problem later :-))<BR><BR>Who else of the group=
is=20
monitoring? It would strongly interest how Markus is received at=
other=20
locations :-) <BR><BR>Best 73 and wish FUN!!<BR><BR>Stefan/DK7FC<B=
R><BR>Am=20
13.11.2010 12:54, schrieb Markus Vester:=20
<BLOCKQUOTE cite=3Dmid:F5E3833FE6F34CD188FAD031556B9682@White type=
=3D"cite">
<META content=3D"MSHTML 6.00.6000.17092" name=3DGENERATOR>
<DIV><FONT face=3DArial size=3D2>Nice wind here in Nuernberg, an=
d I'm back on=20
the /p QTH with my small kite (100m wire, kite currently about=
60m up).=20
Since 11:15 I am sending a carrier on 6470.00, trying to ge=
nerate a=20
small peak on DK7FC's second grabber. Max current into the=
thin wire=20
is about 0.25 A. After</FONT><FONT face=3DArial size=3D2> o=
ne hour at=20
12:15, I intend to switch to 8970.002 Hz, where I can radiate ab=
out 0.2 mW=20
at 0.4 A.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Best 73,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Markus=20
(DF6NM)</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></=
HTML>
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