Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dh06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 5FDD1380000B1; Sat, 26 Nov 2011 13:16:33 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RUMmv-00073w-IX for rs_out_1@blacksheep.org; Sat, 26 Nov 2011 18:15:45 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RUMmu-00073n-Vm for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 18:15:44 +0000 Received: from thalia-smout.broadpark.no ([80.202.8.21]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RUMmr-00045q-Hk for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 18:15:44 +0000 Received: from ignis-smin.broadpark.no ([80.202.8.11]) by thalia-smout.broadpark.no (Sun Java(tm) System Messaging Server 7u3-15.01 64bit (built Feb 12 2010)) with ESMTP id <0LVA00G4E5BS1060@thalia-smout.broadpark.no> for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 19:14:16 +0100 (CET) Received: from [127.0.0.1] ([80.202.132.143]) by ignis-smin.broadpark.no (Sun Java(tm) System Messaging Server 7u3-15.01 64bit (built Feb 12 2010)) with ESMTPA id <0LVA00HXJ5BR8NK0@ignis-smin.broadpark.no> for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 19:14:16 +0100 (CET) Date: Sat, 26 Nov 2011 19:14:15 +0100 From: Steinar Aanesland In-reply-to: <4ED11EFC.1030002@iup.uni-heidelberg.de> To: rsgb_lf_group@blacksheep.org Message-id: <4ED12C77.9030707@broadpark.no> MIME-version: 1.0 References: <66E491BAB91C48AF81191F4022525A14@DennisPC> <6FE757960E6C447781689D4F19A315AE@DennisPC> <4EC2C6EB.2080201@iup.uni-heidelberg.de> <4EC2DB14.9000807@talktalk.net> <4ECFD8B6.2050601@iup.uni-heidelberg.de> <4ED0E0EC.9020404@iup.uni-heidelberg.de> <4ED0FE66.2070706@iup.uni-heidelberg.de> <184BB3B594844BF693BC8F53E3BFC8D1@White> <4ED11EFC.1030002@iup.uni-heidelberg.de> User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:8.0) Gecko/20111105 Thunderbird/8.0 X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: VLF: 8970 Hz transmissions, soon again here Content-type: multipart/alternative; boundary="Boundary_(ID_0BzxfiZpBTU00xGBFy5XOQ)" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:466919328:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d411a4ed12d015fe6 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --Boundary_(ID_0BzxfiZpBTU00xGBFy5XOQ) Content-type: text/plain; charset=ISO-8859-1 Content-transfer-encoding: QUOTED-PRINTABLE Stefan You have probably mention this some place, but please repeat it me, w= hat kind of antenna are you using now ? la5vna S Den 26.11.2011 18:16, skrev Stefan Sch=E4fer: > VLF, > > > Am 26.11.2011 17:55, schrieb Markus Vester: >> Once more, Paul Nicholson is showing a good trace: >> =20 >> http://abelian.org/vlf/fbins.shtml#p=3D1322319600&b=3D120&s=3Dsp >> > > 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 lea= ve > 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 mor= e > 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 QS= B, > caused by propagation... > > A photo of the todays arrangement: > http://dl.dropbox.com/u/19882028/VLF/DSC04268.JPG > > 73, GL, Stefan/DK7FC > > > > > > >> =20 >> ... well done! >> =20 >> Markus >> =20 >> *From:* Markus Vester >> *Sent:* Saturday, November 26, 2011 4:33 PM >> *To:* rsgb_lf_group@blacksheep.org >> *Subject:* Re: VLF: 8970 Hz transmissions, soon again here >> >> Stefan, >> =20 >> around 15:00, your sig on 8970.008 was visible in Nuernberg, peaki= ng >> ~ 20 dB SNR in 0.48 mHz. >> =20 >> Viel Gl=FCck, >> Markus (DF6NM) >> >> *From:* Stefan Sch=E4fer >> *Sent:* Saturday, November 26, 2011 3:57 PM >> *To:* rsgb_lf_group@blacksheep.org >> *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 fi= xed >> 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 whi= ch 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 frequen= cy >> coming from the PC/SpecLab, hopefully without to many phase glitch= es. >> Currently i may have an offset of some 20...30 mHz and a slight dr= ift >> but it is a first successfully test :-) >> >> 73, Stefan/DK7FC >> >> --Boundary_(ID_0BzxfiZpBTU00xGBFy5XOQ) Content-type: text/html; CHARSET=US-ASCII Content-transfer-encoding: QUOTED-PRINTABLE
Stefan

You have probably mention this some place, but please repeat it m= e, 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 ra= in, 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 E= RP? I think it should be in the range of 200 uW. Up to 6 dB can be ad= ded 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 th= e QSB, caused by propagation...

A photo of the todays arrangement: ht= tp://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 ante= nna
current. Strong audible partial discharges occurr on a parall= el fixed
plate capacitor, spaced by 3 cola bottles (0.33l ;-) ). At 55= 0 mH i have
25 kV rms on the antenna and coil which seems to be no proble= m at all.

The frequency is still a bit unstable since i took the DDS VF= O 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 slig= ht drift
but it is a first successfully test :-)

73, Stefan/DK7FC



--Boundary_(ID_0BzxfiZpBTU00xGBFy5XOQ)--