Re: VLF: DK7FC's 9th VLF kite experiment

[Roger Lapthorn <rogerlapthorn@gmail.com>]

Hi Stefan,

All being well, I will be looking for you if I can set up Spectrum Lab properly (again) before the morning. Can you remind me of the best USR file to use?

My grabber (in JO02dg) will be active on 8.970kHz and uploading any captures to https://dl.dropbox.com/u/15047843/xbm_grab.jpg from around 0830z.

Very best of luck with the tests.

73s
Roger G3XBM

2010/12/3 Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>

Dear VLF/LF group,

I will do my 9th VLF experiment tomorrow, saturday 4th December. The permission for a 300m vertical antenna is available! The wind forecast changed again and tomorrow is a very suitable day with stable wind and some sun. Anyway the temperature is about -6 °C. The forecast says that the wind will come up arround 9 UTC and it was shown that the 24h forecast is very accurate to the truth. Thus i plan to start transmitting arround 9 UTC. This may be unfavourable for a TA contact but it just makes no sense before sunrise here without wind. So we need a even greater wonder ;-)

My planned program (if all works well) is:
-Trying to use the 300m vertical on 8970 Hz. At 550W this may radiate up to 100 mW ERP!
-Transmitting a long carrier (about 40 minutes) and after that a short message in DFCW-600 on 8970.00000 Hz (50 mHz DFCW-shift)
-Transmitting a CW on 8970 message for a local test (recording in 4.7 and 17 km distance)
-Maybe transmitting a short message in DFCW-120 on 8970 Hz
-Transmitting DFCW-600 on 6470 Hz. I have to use the 200m antenna for this.
-Transmitting DFCW-600 on 5170 Hz. Since the coil is improved now i can manage to feed more power in the system. The last time it was 150W. Maybe i can reach the full 550 W this time.
-Building up the 137 kHz system during the VLF transmissions and doing some resonating tests with the 200m and 300m antenna.
-Transmitting CW (137.7) and DFCW-4 (137.7) and DFCW-60 (137.777 or 136.320, after talking to Markus or the other QSP partner).
-Maybe coming back to 8970 just befor sunset
-Trying to reach as most stations as possible.
-Trying to make a new distance record, e.g. 4X1RF on 8970 Hz in 2873 km and/or EI8JK on 6470 Hz in 1310 km.
-all i have forgotten

The signals are tracked by a GPS module and are transmitted by using DL4YHFs SpecLab! The accuracy is about 10 ppb.

You can follow the activity on many grabbers. Mine is in 40.00 km distance and is the nearest one. As usual, 8970 Hz can be watched at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html , 6470 Hz and 5170 Hz at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html  (the VLF-PC has had a power supply failure tonight. This has been exchanged today, so some windows (especially 6000 and 60000)) have lost some data. I hope it works now...
The 4X1RF grabber which is one of my goals is available at http://qsl.net/4x1rf/vlf/vlfgrabber.htm. There are several other grabbers that have and will be announced here.

All reports are very much appreciated!

Wish you fun and low noise :-)

Best 73, Stefan/DK7FC




Am 02.12.2010 13:13, schrieb Stefan Schäfer:

Dear VLF/LF group,

The wind forecast is still promising and so i announced my next VLF/LF kite experiment at the german air traffic control and will get the permission for a 300m vertical antenna during daytime. The WX is promising on saturday and on sunday. Thus i will decide the day tomorrow since the forecast becomes most probably as estimated 24 hours before. My favorite day is saturday.
So, i will inform you tomorrow more detailed about the planned program.

Will someone try an attempt to receive that signal? :-)

73, Stefan/DK7FC

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