Re: VLF: G3XIZ on 8970 Hz

[Chris Osborn <g3xiz@yahoo.co.uk>]

Hello Stefan,

Thanks for the good wishes and advice.
Eddie G3ZJO  (about 50 km) is looking for my signal.

The aerial current is about 0.15 A and the TX power about 100 watts RF.

I have built an off air frequency standard which is locked to Droitwich (198 kHz)
It has a 10 kHz output and maybe I can use that in future for more precise frequency generation.

I am presently making a more efficient loading coil which should be ready soon.

73 Chris G3XIZ

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From: Stefan Schäfer <schaefer@iup.uni-heidelberg.de>
To: rsgb_lf_group@blacksheep.org
Sent: Sun, 27 February, 2011 18:23:33
Subject: Re: VLF: G3XIZ on 8970 Hz

Hello Chris,

I wish you good luck!

What will be your antenna current and what is the current maximum TX power?

Do you have enough RX stations in a radius of some 100 km?

If you want to do a test in transmitting a 24 hours accurate carrier, i could set up a "60000" window at your frequency. But it only makes sense if your TX is locked to a MSK transmitter (e.g. GBZ) or GPS. A OCXO or so is drifting much to strong for a 47 uHz window.

I see a real chance to see a trace of you if you send a 24 hour carrier, locked.

73, Stefan/DK7FC



Am 27.02.2011 17:14, schrieb Chris Osborn:

Very well done.

I have been trying for the past 2 weekends to launch my balloons or kite aerial but the weather
has been unsuitable.

Inspired by ops using just their home aerials I shall give my 40m end fed inverted 'L' another try.

I shall transmit a constant carrier on

8.976 661 7 kHz

for the next few hours in the hope that someone will pick up my signals.

At some point I could try a longer period maybe over night.

73 Chris G3XIZ

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From: Stefan Schäfer <schaefer@iup.uni-heidelberg.de>
To: rsgb_lf_group@blacksheep.org
Sent: Sat, 26 February, 2011 22:35:07
Subject: Re: VLF: OE5ODL,OE3GHB and DF6NM on 8970 Hz

...now Markus appears at 17 dB SNR in my "DFCW-60000" window, exactly at 8970.0020 Hz, see http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html

It is remarkable that all the 3 stations use their home antenna, no kites or balloons, TX power below 300 W! This shows what others could do on VLF as well. My distance to OE3GHB is 590 km!

Also it is interesting that 3 QSOs could easily take place in a bandwidth of 10 mHz :-)

It's fun and fascinating, thus not useless :-)

73, Stefan/DK7FC


Am 26.02.2011 23:03, schrieb Stefan Schäfer:
> VLF,
>
> Capture OE5ODL (8970.005 Hz, until 14 UTC), OE3GHB (8969.98 Hz), DF6NM (from 13 UTC, first drifting, then lock to 8970.002 Hz) in 424 uHz
>
> 73, Stefan/DK7FC
>