Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.5 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, HTML_MESSAGE,MISSING_MIMEOLE,RCVD_IN_DNSWL_MED,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v0RLqYun026957 for ; Fri, 27 Jan 2017 22:52:35 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cXENV-00019y-Cu for rs_out_1@blacksheep.org; Fri, 27 Jan 2017 21:48:17 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cXENU-00019p-ET for rsgb_lf_group@blacksheep.org; Fri, 27 Jan 2017 21:48:16 +0000 Received: from mailout03.t-online.de ([194.25.134.81]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1cXENO-0002qu-Ji for rsgb_lf_group@blacksheep.org; Fri, 27 Jan 2017 21:48:15 +0000 Received: from fwd20.aul.t-online.de (fwd20.aul.t-online.de [172.20.26.140]) by mailout03.t-online.de (Postfix) with SMTP id CFF81425D595 for ; Fri, 27 Jan 2017 22:48:07 +0100 (CET) Received: from spica16.aul.t-online.de (JrwXEGZLZhea23rNcSaKsCOd0KDEovpVKtBTM-V3JZe5uNLdTWV2f-JdKTrXaWegJk@[172.20.102.124]) by fwd20.aul.t-online.de with esmtp id 1cXENC-1ZRdXk0; Fri, 27 Jan 2017 22:47:58 +0100 Received: from 31.16.171.193:30281 by cmpweb17.aul.t-online.de with HTTP/1.1 (Lisa V4-6-6-0.13826 on API V5-3-1-0) Received: from 172.20.102.136:39424 by spica16.aul.t-online.de:8080; Fri, 27 Jan 2017 22:47:57 +0100 (MET) Date: Fri, 27 Jan 2017 22:47:57 +0100 (MET) From: "dj8wx@t-online.de" To: "rsgb_lf_group@blacksheep.org" Message-ID: <1485553677893.4040589.f73c5489816d154cdcc3cc6b7772802abe98cc90@spica.telekom.de> In-Reply-To: <588B521E.3080903@posteo.de> References: <159e00f42d3-7bf3-ae24@webprd-m95.mail.aol.com> <588B521E.3080903@posteo.de> MIME-Version: 1.0 Importance: normal X-MSMail-Priority: normal X-Priority: 3 X-UMS: email X-ID: JrwXEGZLZhea23rNcSaKsCOd0KDEovpVKtBTM-V3JZe5uNLdTWV2f-JdKTrXaWegJk@t-dialin.net X-TOI-MSGID: 480c5629-0b64-4c67-abfb-504b6e1521bc X-Scan-Signature: 882bdeb3d60c37e569eb1f790f5c4a0f Subject: AW: VLF: Transmission announcement for 8270 Hz Content-Type: multipart/alternative; boundary="----=_Part_3880068_350973354.1485553677905" 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-Scanned-By: MIMEDefang 2.75 Status: RO X-Status: X-Keywords: X-UID: 10362 ------=_Part_3880068_350973354.1485553677905 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Stefan, Markus, no, the new mast has like the other one no contact to earth. It is isolated= =20 by an ceramic isolater used by the high voltage electricity industry, abt= =20 50cm above ground. the third one is a grounded 16-m-tower, fortunately abt 90m off the coils= =20 and the vertical part of the antenna. the tests have not been finished jet. I have to change things at the field= =20 windings because the feed point has now 250uH what should be 116uH for a Z= =20 of 5 Ohm on 8270Hz. 73 Uwe/dj8wx =20 =20 =20 =20 -----Original-Nachricht----- Betreff: Re: VLF: Transmission announcement for 8270 Hz Datum: 2017-01-27T15:01:27+0100 Von: "DK7FC" An: "rsgb_lf_group@blacksheep.org" =20 =20 =20 Hello Markus, The coil+antenna is running at 25 kV now. And quite relaxed! Not a trace of= =20 partial discharges on the top of the coil. It looks like this can be done= =20 regularly from now on, so don't stress with your observations. However the= =20 QRN is low now and phase variations are better to observe... There was an= =20 interesting phase change on Pauls grabber as well. When moving the bearing= =20 there is a strong dip in the signal strength, looks almost unrealistic. See the latest plots at=20 http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/TX.png The antenna=20 current is held exactly! I even thought about a protection like: If antenna current deviation > 50= =20 mA =3D> Start timer (2 sec) =3D> If current deviation still > 50 mA, then s= top=20 transmitting; else, ignore. A signal already builds up in Italy too:=20 http://www.vlf.it/cumiana/livedata.html 20 dB SNR in 47 uHz! I hope that Alex/RN3AUS will pick it up as well. The recent problem (my dropping antenna current) was rather a PA problem=20 than a coil problem, fortunately. The PA runs without any problem at up to= =20 5 A DC / 25V. But now i'm trying to strech the limits and this leads to=20 working point instabilities which led to a partly faulty FET (IRFP064N).=20 With this faulty FET i've done the 2970 Hz experiment last week ;-) But now= =20 it has been replaced. I also increased the source resistors from 0.1 Ohm to= =20 0.22 Ohm. But this reduces the gain significantly. So i increased the=20 supply voltage of the drive OP AMP from 12V to 25V. It still doesn't really= =20 work. Thus i'm just running 600 mA now ;-) With 700 mA i can generate=20 another 1.33 dB whch can be quite significant in distances > 1000 km... 73, Stefan Am 27.01.2017 14:13, schrieb Markus Vester: Hi Stefan, thanks for the invitation. Three stations simultaneusly on air would be cool, just like in the old days on 8970. My antenna is up, but today I'd rather make use of your strong carrier to observe the diurnal variation. Looks like we've already entered the midday minimum. Maybe I should set up another instance to observe the phase evolution as well. There's also some directional variation in Todmorden: After 8 UT, your carrier is better at 90=C2=B0 azimuth but lacking at 130=C2=B0. =20 Best 73, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung----- Von: DK7FC An: rsgb_lf_group Verschickt: Fr, 27. Jan 2017 13:37 Betreff: Re: VLF: Transmission announcement for 8270 Hz Hello Uwe, Your signal looks nice on Pauls grabber. Is the new ALU tower higer than the tree before? Did you ground it to the VLF earth? Are you now getting more antenna current? How much? Markus, will you join us on the 36 km band? :-) As far as i remember there were never 3 amateur stations active on VLF to the same time :-) 73, Stefan Am 27.01.2017 12:55, schrieb dj8wx@t-online.de: > I swirched the carrier on 8270Hz off, trying to receive the DK7FC carrier. > 73 > Uwe/dj8wx > > > > -----Original-Nachricht----- > Betreff: Re: VLF: Transmission announcement for 8270 Hz > Datum: 2017-01-27T12:32:06+0100 > Von: "DK7FC"= =20 > > An: "rsgb_lf_group@blacksheep.org " > > > Hello Mike, > > I'm sorry, it was late in the night and i was already a bit sleeping it > seems :-) > > I am transmitting RIGHT NOW! So give it a try :-) > Watch the grabbers to see whats actually going on... > > 73, Stefan > > Am 27.01.2017 12:03, schrieb Mike Dennison: > >> I am confused by this announcement. From the date stamp, Stefan seems >> to be announcing that he will transmit on Saturday, but Markus >> reports him on Friday. >> >> Which day will Stefan transmit his carrier? I am keen to receive but >> it takes me a few hours to start up my VLF receive system. >> >> Mike, G3XDV >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >> >> >> >>> Nice signal here in Nuernberg, ~ 15 dB SNR in 477 uHz. No idea what >>> caused the gap in the trace around 8 UT. >>> >>> Paul's spectrogram currently shows both carriers, 8270.000 and >>> 8270.005 Hz. >>> >>> Best 73, >>> Markus >>> >>> >>> >>> >>> >>> >>> -----Urspr=C3=BCngliche Mitteilung----- >>> Von: DK7FC= =20 > >>> An: rsgb_lf_group > >>> Verschickt: Fr, 27. Jan 2017 2:45 >>> Betreff: VLF: Transmission announcement for 8270 Hz >>> >>> >>> Hi VLF, >>> >>> Tomorrow starting 7 UTC i'm going to run a carrier on 8270.005 Hz. It >>> will run for a few hours during the low QRN period. Just in case >>> someone wants to try to receive... >>> >>> 73, Stefan >>> >>> PS: 600 mA antenna current so far. >>> >>> >>> ----- >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 2016.0.7998 / Virus Database: 4749/13841 - Release Date: >>> 01/26/17 >>> >>> >>> >> >> >> > > > ---------------------------------------------------------------- > Gesendet mit Telekom Mail > - kostenlos und sicher f=C3=BCr alle! > > =EF=BB=BF
=20 Gesendet mit Telekom Mail - kostenlos= =20 und sicher f=C3=BCr alle! ------=_Part_3880068_350973354.1485553677905 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

no, the new mast has like the= other one no contact to earth. It is isolated by an ceramic isolater used = by the high voltage electricity industry, abt 50cm above ground.
the third one is a grounded 16-m-to= wer, fortunately abt 90m off the coils and the vertical part of the antenna= .
the tests have not been= finished jet. I have to change things at the field windings because the fe= ed point has now 250uH what should be 116uH for a Z of 5 Ohm on 8270Hz.

73
Uwe/dj8wx

 

 

 

 

-----Original-Nachricht-----

Betreff: Re: VLF: Transmission announcement for 8= 270 Hz

Datum: 2017-01-27T15:01:27+0100

Von: "DK7FC" <selberdenken@posteo.de>

An: "rsgb_lf_group@blacksheep.org" <rsgb_lf_gr= oup@blacksheep.org>

 

 

 

Hello Markus,

The coil+antenna is running at 25 kV now. = And quite relaxed! Not a trace of partial discharges on the top of the coil= . It looks like this can be done regularly from now on, so don't stress wit= h your observations. However the QRN is low now and phase variations are be= tter to observe... There was an interesting phase change on Pauls grabber a= s well. When moving the bearing there is a strong dip in the signal strengt= h, looks almost unrealistic.

See the latest plots at http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/TX.png<= /a> The antenna current is held exactly!
I even thought about a prot= ection like: If antenna current deviation > 50 mA =3D> Start timer (2= sec) =3D> If current deviation still > 50 mA, then stop transmitting= ; else, ignore.

A signal already builds up in Italy too: http://www.vlf.it/cumiana/livedata.html 20 dB SNR in 47 uHz!
= I hope that Alex/RN3AUS will pick it up as well.

The recent p= roblem (my dropping antenna current) was rather a PA problem than a coil pr= oblem, fortunately. The PA runs without any problem at up to 5 A DC / 25V. = But now i'm trying to strech the limits and this leads to working point ins= tabilities which led to a partly faulty FET (IRFP064N). With this faulty FE= T i've done the 2970 Hz experiment last week ;-) But now it has been replac= ed. I also increased the source resistors from 0.1 Ohm to 0.22 Ohm. But thi= s reduces the gain significantly. So i increased the supply voltage of the = drive OP AMP from 12V to 25V. It still doesn't really work. Thus i'm just r= unning 600 mA now ;-) With 700 mA i can generate another 1.33 dB whch can b= e quite significant in distances > 1000 km...

73, Stefan

Am 27.01.2017 14:13, schrieb Markus Vester:

Hi Stefan,

thanks for the invitation. Three= stations simultaneusly on air would be cool, just like in the old day= s on 8970. My antenna is up, but today I'd rather make use of your strong c= arrier to observe the diurnal variation. Looks like we've already entered t= he midday minimum. Maybe I should set up another instance to observe t= he phase evolution as well.

There's also some directional vari= ation in Todmorden: After 8 UT, your carrier is better at 90° azimuth b= ut lacking at 130°.  

Best 73,
Markus (DF6= NM)

-----Ursprüngliche Mitteilung-----
Von: DK7FC = &= lt;selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_= group@blacksheep.org>
Verschickt: Fr, 27. Jan 2017 13:37
= Betreff: Re: VLF: Transmission announcement for 8270 Hz
Hello Uwe,

Your signal looks nice on Pauls grabber.

Is the new ALU tower higer than the tree before? Did you ground it to the VLF earth? Are you now getting more antenna current? How much?

Markus, will you join us on the 36 km band? :-) As far as i remem= ber
there were never 3 amateur stations active on VLF to the same ti= me :-)

73, Stefan



Am 27.01.2017 12:= 55, schrieb dj8wx@t-online.de:
> I swirched the carrier on 8270H= z off, trying to receive the DK7FC carrier.
> 73
> Uwe/dj= 8wx
>
>
>
> -----Original-Nachricht----= -
> Betreff: Re: VLF: Transmission announcement for 8270 Hz
= > Datum: 2017-01-27T12:32:06+0100
> Von: "DK7FC"<selberdenken@posteo.de>
> An= : "rsgb_lf_group@blacksheep= .org"<rsgb_lf_group@= blacksheep.org>
>
> Hello Mike,
>
&= gt; I'm sorry, it was late in the night and i was already a bit sleeping it=
> seems :-)
>
> I am transmitting RIGHT NOW! So= give it a try :-)
> Watch the grabbers to see whats actually goin= g on...
>
> 73, Stefan
>
> Am 27.01.201= 7 12:03, schrieb Mike Dennison:
>
>> I am confused by= this announcement. From the date stamp, Stefan seems
>> to be = announcing that he will transmit on Saturday, but Markus
>> rep= orts him on Friday.
>>
>> Which day will Stefan tra= nsmit his carrier? I am keen to receive but
>> it takes me a fe= w hours to start up my VLF receive system.
>>
>> Mi= ke, G3XDV
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> >>
>>
>>> Nice signal here in Nuernb= erg, ~ 15 dB SNR in 477 uHz. No idea what
>>> caused the gap= in the trace around 8 UT.
>>>
>>> Paul's spe= ctrogram currently shows both carriers, 8270.000 and
>>> 827= 0.005 Hz.
>>>
>>> Best 73,
>>>= Markus
>>>
>>>
>>>
>= >>
>>>
>>>
>>> -----Ursp= rüngliche Mitteilung-----
>>> Von: DK7FC<selberdenken@posteo.de>
>>= ;> An: rsgb_lf_group<= rsgb_lf_group@blacksheep.org>
>>> Verschickt: Fr, 27.= Jan 2017 2:45
>>> Betreff: VLF: Transmission announcement f= or 8270 Hz
>>>
>>>
>>> Hi VLF,=
>>>
>>> Tomorrow starting 7 UTC i'm going to= run a carrier on 8270.005 Hz. It
>>> will run for a few hou= rs during the low QRN period. Just in case
>>> someone wants= to try to receive...
>>>
>>> 73, Stefan
>>>
>>> PS: 600 mA antenna current so far.
= >>>
>>>
>>> -----
>>>= No virus found in this message.
>>> Checked by AVG - www.avg.com
>>> Version: 2016.0= .7998 / Virus Database: 4749/13841 - Release Date:
>>> 01/26= /17
>>>
>>>
>>>
>>= ;
>>
>>
>
>
> --------= --------------------------------------------------------
> Gesende= t mit Telekom Mail<https= ://t-online.de/email-kostenlos> - kostenlos und sicher für alle= !
>
>
=EF=BB=BF

 
Gesendet mit Telekom Mail - kostenlos und sicher f=C3=BCr alle! ------=_Part_3880068_350973354.1485553677905--