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
