Hello group,
Short information from Stefan,
DK7FC.
Unfortunately their was some
rain and big clouds over his QTH, but now it looks
better include the actual weather forecast in the
internet. This causing some delays, but Stefan is now in
the middle to bring up the antenna. He estimated a start
time around 10am CET – so in about 30-40min.
vy73
Marco
DD7PC
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
