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Re: VLF: 8970 Hz transmissions, soon again here

To: [email protected]
Subject: Re: VLF: 8970 Hz transmissions, soon again here
From: Steinar Aanesland <[email protected]>
Date: Sat, 26 Nov 2011 20:10:34 +0100
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hummmm "You have probably mention this some place, but please repeat it me" is very "Norwegian-English"  . "you've probably mentioned it somewhere, but please repeat it for me" is probably more like it ;)

S la5vna





Den 26.11.2011 19:14, skrev Steinar Aanesland:

Stefan

You have probably mention this some place, but please repeat it me, what kind of antenna are you using now ?

la5vna S


Den 26.11.2011 18:16, skrev Stefan Schäfer:
VLF,


Am 26.11.2011 17:55, schrieb Markus Vester:
Once more, Paul Nicholson is showing a good trace:
 

Wow, yes, very good!

Well, the system runs on the GPS locked system now since 17:00 UTC and i'm running 780 mA on 8970.00000 Hz. Will go for dinner now and leave the system running some hours. The WX looks quite useful, no rain, poor wind and no fog! Maybe i will even run it overnight until tomorrow, transmitting a streight carrier at 350 W RF. Can't do more unfortunately, due to the cola-cap ;-)

Now as the signal is locked and non-drifting there may come up something on the 6000-windows...

Maybe Paul or others can do some calculations, estimating the ERP? I think it should be in the range of 200 uW. Up to 6 dB can be added in further tests, i hope.
Markus, a S/N (better S and N ;-) ) plot on your side would be interesting. My ERP should be constant now so we can observe the QSB, caused by propagation...

A photo of the todays arrangement: http://dl.dropbox.com/u/19882028/VLF/DSC04268.JPG

73, GL, Stefan/DK7FC






 
... well done!
 
Markus
 
Sent: Saturday, November 26, 2011 4:33 PM
Subject: Re: VLF: 8970 Hz transmissions, soon again here

Stefan,
 
around 15:00, your sig on 8970.008 was visible in Nuernberg, peaking ~ 20 dB SNR in 0.48 mHz.
 
Viel Glück,
Markus (DF6NM)

Sent: Saturday, November 26, 2011 3:57 PM
Cc: Paul
Subject: Re: VLF: 8970 Hz transmissions, soon again here

VLF,

I'm now running 350W into the system and get about 0.8 A antenna
current. Strong audible partial discharges occurr on a parallel fixed
plate capacitor, spaced by 3 cola bottles (0.33l ;-) ). At 550 mH i have
25 kV rms on the antenna and coil which seems to be no problem at all.

The frequency is still a bit unstable since i took the DDS VFO which is
more comfortable to find the resonance. I will now try to slightly QRO
and then apply a fiber optic cable carrying the GPS locked frequency
coming from the PC/SpecLab, hopefully without to many phase glitches.
Currently i may have an offset of some 20...30 mHz and a slight drift
but it is a first successfully test :-)

73, Stefan/DK7FC




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