----- Original Message -----
Sent: Saturday, June 18, 2011 10:43
AM
Subject: Re: VLF: DK7FC's 11th VLF kite
experiment
Stefan
Strong signal on 8970 at 0930 utc -120 dB es
Signal over noise at my QTH is approx 20 dB in DFCW 600 window.
Antenna 150 metres inv L up 33 metres high es 2
insulated ground radials.
Antenna direct to sound card es using S/lab
If you are QRV 137.7 Khz will sent report on
QRS3
73 es GL De Mal/G3KEV
----- Original Message -----
Sent: Friday, June 17, 2011 5:14
PM
Subject: Re: VLF: DK7FC's 11th VLF kite
experiment
Dear VLF group,
Now, the wind forecast shows excellent
wind for tomorrow and unstable and poor wind for sunday. So i will do the
11th experiment tomorrow, Saturday, 18. June 2011.
Tnx in advance
to Markus/DF6NM who will be available on the phone to make QSP to the LF
reflector.
Vy 73, Stefan/DK7FC
Am 16.06.2011 13:58, schrieb
Stefan Schäfer:
Dear VLF group,
Since more than 4 months the wind and
rain situation looks promising for the weekend on my /p QTH in
JN49IS36VH. So i plan to do my 11th VLF kite experiment this
weekend, either on Sat 18th or Sun 19th June 2011, will be
announced on friday. I already announced it at the German air traffic
control and just got a phone call were the permission was
granted.
The plan is to come on air at about 6
UTC.
The antenna will be the 300m vertical kite antenna.
I'll plan to serve the bands 33km and 46km, i.e. 8970 Hz and 6470 Hz.
Since i made a new tap on the TX coil i can now resonate the 300m
antenna on 6470 Hz too. This should give a about 4 dB stronger signal on
46km.
Since the gap of low QRN is much smaller now, the experiment
will not take many hours, maybe just 4 or 5.
Maybe i can get the 4
kVA generator and will produce a 6 dB stronger signal but this is not
clear so far. Otherwise i am limited to 550 W TX power. I will limit my
antenna current to 2 A in order to prevent a HV breakdown on the coil and
due to thermal losses. At 2 A antenna current i should have up to 250 mW
ERP!
The program is to start a longer dash, about 40 minutes, GPS
locked on 8970.00000 Hz, then a message in DFCW-600. Depending on the
feedback of receiving stations i will try to send DFCW-60 or DFCW-10 or
DFCW-3 and CW.
Then i'll move to 6470 Hz, transmitting a 40 minutes
dash and a "K" in DFCW-600 or so.
As usual the signals will be
visible on my grabber in 40 km distance:
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html
for 8970 Hz and
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html
for 6470 Hz (spectrogram still not available)
but surely visible on
many other grabbers too ( see https://sites.google.com/site/sub9khz/vlf-grabbers
for a list of available Dreamer Band grabbers).
Some new VLF
receivers appeared since my last experiment. Two of them are:
http://qsl.net/4x1rf/yo/vlfgrabber.htm
(1435 km)
http://www.ok2bvg.cz/vlfgrabber/
(598 km)
Leaving a trace on these and all other new and old VLF
stations is the goal! Despite high QRN and the longest days in the year
(here in EU) i am optimistic.
Maybe Markus/DF6NM or Marco/DD7PC or
someone else in DL wants to be available on the phone for QSP to the
reflector?
Looking forward to the weekend and hope all works well
and we'll have much activity.
Best 73,
Stefan/DK7FC
