Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id vAUJsrER003626 for ; Thu, 30 Nov 2017 20:54:55 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eKUpo-0003wg-PB for rs_out_1@blacksheep.org; Thu, 30 Nov 2017 19:49:24 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eKUpo-0003wX-8c for rsgb_lf_group@blacksheep.org; Thu, 30 Nov 2017 19:49:24 +0000 Received: from smtpcmd10108.aruba.it ([62.149.156.108]) by relay1.thorcom.net with esmtp (Exim 4.89) (envelope-from ) id 1eKUpj-000147-Ri for rsgb_lf_group@blacksheep.org; Thu, 30 Nov 2017 19:49:23 +0000 Received: from ik0vve.net ([62.149.156.211]) by smtpcmd10.ad.aruba.it with bizsmtp id gKpG1w00t4ZwMme01KpG0Y; Thu, 30 Nov 2017 20:49:18 +0100 Date: Thu, 30 Nov 2017 20:49:16 +0100 Message-Id: In-Reply-To: <5A1FFEAE.3040603@posteo.de> References: =?iso-8859-1?q?=3C4d96a9d4=2D5f22=2D7650=2D872b=2D6344e9aea8e3=40abel?= =?iso-8859-1?q?ian=2Eorg=3E_=3C5A19FF75=2E7080801=40posteo=2Ede=3E_?= =?iso-8859-1?q?=3CCANA3B6VmLfG7AA692ajKxa6=2BswztKOmi=2DYcattQQOi=5Fm?= =?iso-8859-1?q?MPzitA=40mail=2Egmail=2Ecom=3E_=3C5A1FFEAE=2E3040603?= =?iso-8859-1?q?=40posteo=2Ede=3E?= MIME-Version: 1.0 X-Sensitivity: 3 From: "Max IK0VVE" To: rsgb_lf_group@blacksheep.org X-XaM3-API-Version: V4(R2) X-SenderIP: 212.66.105.14 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aruba.it; s=a1; t=1512071358; bh=5C1Ucc/kYks7vAXGW3+3M5WLHgAaBxJdtXY5R0y+5+Q=; h=Date:Subject:MIME-Version:Content-Type:From:To; b=fNw9wZKmgWZ2NXGrcfGE3bNUWg2lq4+ir+Fx7BGEPXPqK1TWbN8p8Uexb6fRvl5jB M6d8ScAfppRda7hHGuckkXHbFMQkzgXrLqCpaudtsWRQdO//y860KztpBYHlvEfNOo s8XLAvSni2fikViNHM1s7TQbB5EdMfCFM3EOM+BAeBxb2TtK5G6B9XQ++rIJUZqapK Ft0dqd8uRjbwRaPWzEIrfRbe/0CAuXgB44V4ROnupwHsCfa4k6emGF50NcF1vKzNot nR0TA2FfNY+1StEe+jjlrsRwjDebH78XA3KW/cx0QqTa1LFw63+rqAcYOsCyytTmuH 9tKsw/vIN2sKw== X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: GE dears, I'm also following your TX, Stefan, with a 424 uHz grabber with no result at the moment. I'll try also the 42 uHz one. As antenna I'm using the MF TX marconi because whip and loop are ready for the qsy in the "silent-qth". Noise with this antenna is very high but I'm in RX anyway. Thanks for transmission. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 T_KAM_HTML_FONT_INVALID BODY: Test for Invalidly Named or Formatted Colors in HTML 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 46d617994b9fba079dc3ad7182acba54 Subject: Re: VLF: DK7FC close to SAQ Content-Type: multipart/alternative; boundary="_=__=_XaM3_.1512071356.2A.644334.42.1364.52.42.007.819783570" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.2 required=5.0 tests=HTML_20_30,HTML_MESSAGE, LINK_TO_NO_SCHEME 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 --_=__=_XaM3_.1512071356.2A.644334.42.1364.52.42.007.819783570 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable GE dears,=0A=0AI'm also following your TX, Stefan, with a 424 uHz grabber= with no result at the moment. I'll try also the 42 uHz one.=C2=A0 =0AAs = antenna I'm using the MF TX marconi because whip and loop are ready for t= he qsy in the "silent-qth". Noise with this antenna is very high but I'm = in RX anyway.=0AThanks for transmission.=0A=0A73, Max IK0VVE=C2=A0=0A=0A=0A= ______________________________=C2=A0...here some of my HAM Radio projects= ...=0A=0Awww.ik0vve.net=0A=0A=0ADa: owner-rsgb_lf_group@blacksheep.org=0A= A: rsgb_lf_group@blacksheep.org=0ACc: =0AData: Thu, 30 Nov 2017 13:50:54 = +0100=0AOggetto: Re: VLF: DK7FC close to SAQ=0A=0A=0AHello VLF freinds,=0A= =C2=A0=0AI spent some day in Berlin, thus the late reply, sorry.=0AThe ca= rrier is actually running since 25.Nov 23 UTC witout any =0Ainterruption!= I have/had control over the TX via the samrtphone. I can =0Afollow the a= ntenna current and can access the PC to stop the =0Atransmission if somet= hing would be wrong. Also there is the safety =0Afunction that stops the = transmission as soon as the antenna current =0Adrops by more than 30 mA u= nder the target level of 700 mA.=0A=C2=A0=0AThanks to all stations who ga= ve a feedback and RX report of the first =0Aamateur transmission on 17.47= kHz.=0ASpecial congrats to IW4DXW who made his first amateur VLF recepti= on at =0Aall (i think)!=0A=C2=A0=0ARiccardo, is that spectrogram really s= et to 3.8 mHz FFT bin width, as =0Astated in the text field?=0AYour simpl= e antenna matching schmatic is apprechiated. It may be helpful =0Afor fur= ther stations. I note that no special preamp is needed.=0A=C2=A0=0ALuis, = your few bright pixels look most promising. But maybe it is better =0Ato = wait until tomorrow before claiming that new distance record on the =0A17= km band. It would be a first amateur detection on VLF between DL and =0A= EA! This evening i will finally rise the ERP by 3 dB, going from 700 mA =0A= to 1 A antenna current... With 3 dB more, the few pixels should become a = =0Asolid line.=0ABTW all this helps to see how 'far' you are away from ge= tting a =0Adetection on 8270 and below..=0A=C2=A0=0ASq5BPF has set up a g= rabber but didn't see a trace so far. I started a =0Agrabber window at RC= 4HAA running at 212 uHz. There is no trace at all! I =0Adid expect much b= etter results over that distance.=0AAlso KL7L has set up a grabber window= , without results so far.=0AMy first impression is that the band offers l= ess better propagation than =0Aexpected! So let's hope that QRO will help= :-)=0A=C2=A0=0ABefore loosing these informations i set up a small list c= ontaining =0Ainformations about RX stations and SNR reports, see attachme= nt. Tell me =0Aif there is something wrong or if i forgot something.=0A=C2= =A0=0AI will inform when the signal level has changed or when interruptio= ns =0Ahappened. So far the transmission is still running. Ah yes the ante= nna =0Acurrent ca be followed at =0Ahttp://www.iup.uni-heidelberg.de/scha= efer_vlf/VLF/TX.png Quite =0Aunspectacular but some kind of feedback...=0A= =C2=A0=0A73, Stefan=0A=C2=A0=0A=C2=A0=0AAm 29.11.2017 22:46, schrieb Ricc= ardo Zoli:=0A> Hi Stefan, VLF=0A>=C2=A0=0A> I got your signal in JN64bw, = dear Stefan. Depending on the QSB and/or=0A> QRN, you're peaking 15dB ove= r noise. Fantastic! :-))=0A> I'm using my LF antenna tuned on your QRG wi= th a (approx.) 200mH coil.=0A> The 17470.5 signal (locally generated by a= GPS disciplined DDS) is=0A> used for Spectrum Lab SR correction.=0A> Sch= ematic and capture attached.=0A>=C2=A0=0A>=C2=A0=0A> Congrats, Stefan, an= d keep up the good work!=0A>=C2=A0=0A> All the best,=0A>=C2=A0=0A> 73 de = Riccardo IW4DXW=0A>=C2=A0=0A>=C2=A0=0A>=C2=A0=0A> 2017-11-26 0:40 GMT+01:= 00 DK7FC:=0A> =0A>> Hi VLF,=0A>>=C2=A0=0A>> Si= nce 23 UTC a 700 mA carrier is running on 17.4701 kHz!=0A>>=C2=A0=0A>> It= is a little surprise to the VLF community i think ;-)=0A>>=C2=A0=0A>> Le= gal? Yes:=0A>> http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/17,47kHz= _Sonderlizenz.jpg=0A>> Actually the document has 3 pages but the other on= es are no so relevant.=0A>> My ERP is limited to 5 mW. I did not request = more because more isn't=0A>> possible anyway with this antenna.=0A>>=C2=A0= =0A>> I wound a big single layer coil with 0.5 mm enameled wire on a PVC = tube with=0A>> 315 mm outher diameter.=0A>>=C2=A0=0A>> 0.7 A is just a fi= rst careful step. The coil is designed to hold 1.5 A 'key=0A>> down'.=0A>= >=C2=A0=0A>> The carrier will run the whole night and even tomorrow at da= ytime.=0A>>=C2=A0=0A>> Worldwide reports are welcome ;-)=0A>>=C2=A0=0A>> = It is not sub-9-kHz but still VLF, the 17 km band!! So give it chance :-)= =0A>>=C2=A0=0A>> The tree has still some solar power to stream the signal= from the EW loop=0A>> down to the city, so there is a feedback spectrogr= am at=0A>> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabbe= r2.html=0A>>=C2=A0=0A>>=C2=A0=0A>> 73, Stefan=0A>>=C2=A0=0A>> PS: I still= can hear that tone of the coil. It is terrible! Be happy when=0A>> you a= re older than me!=0A>> --_=__=_XaM3_.1512071356.2A.644334.42.1364.52.42.007.819783570 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
GE dears,
=
I'm also following your TX, Stefan, with a 424 uHz grabber with no re= sult at the moment. I'll try also the 42 uHz one. 
As antenna I'= m using the MF TX marconi because whip and loop are ready for the qsy in = the "silent-qth". Noise with this antenna is very high but I'm in RX anyw= ay.
Thanks for transmission.

73, Max IK0VVE 


______________________________

 
..= .here some of my HAM Radio projects...




=0A=
Da= : owner-rsgb_lf_group@blacksheep.org
=0AA: rsgb_lf_group@blacksheep.org
=0A
Cc:
=0A
Data: Thu, 30 Nov 2017 13:50:54 +0= 100
=0A
Oggetto: Re: VLF: DK7FC close to SAQ
=0A
=0A
Hello VLF freinds,
 
I= spent some day in Berlin, thus the late reply, sorry.
The carr= ier is actually running since 25.Nov 23 UTC witout any
interru= ption! I have/had control over the TX via the samrtphone. I can
follow the antenna current and can access the PC to stop the transmission if something would be wrong. Also there is the safety
function that stops the transmission as soon as the antenna current=
drops by more than 30 mA under the target level of 700 mA.
 
Thanks to all stations who gave a feedback and R= X report of the first
amateur transmission on 17.47 kHz.
=
Special congrats to IW4DXW who made his first amateur VLF reception = at
all (i think)!
 
Riccardo, is that= spectrogram really set to 3.8 mHz FFT bin width, as
stated in= the text field?
Your simple antenna matching schmatic is appre= chiated. It may be helpful
for further stations. I note that n= o special preamp is needed.
 
Luis, your few bri= ght pixels look most promising. But maybe it is better
to wait= until tomorrow before claiming that new distance record on the
17 km band. It would be a first amateur detection on VLF between DL and=
EA! This evening i will finally rise the ERP by 3 dB, going f= rom 700 mA
to 1 A antenna current... With 3 dB more, the few p= ixels should become a
solid line.
BTW all this helps= to see how 'far' you are away from getting a
detection on 827= 0 and below..
 
Sq5BPF has set up a grabber but = didn't see a trace so far. I started a
grabber window at RC4HA= A running at 212 uHz. There is no trace at all! I
did expect m= uch better results over that distance.
Also KL7L has set up a g= rabber window, without results so far.
My first impression is t= hat the band offers less better propagation than
expected! So = let's hope that QRO will help :-)
 
Before loosi= ng these informations i set up a small list containing
informa= tions about RX stations and SNR reports, see attachment. Tell me
if there is something wrong or if i forgot something.
 =
I will inform when the signal level has changed or when interr= uptions
happened. So far the transmission is still running. Ah= yes the antenna
current ca be followed at
http://w= ww.iup.uni-heidelberg.de/schaefer_vlf/VLF/TX.png Quite
unspect= acular but some kind of feedback...
 
73, Stefan=
 
 
Am 29.11.2017 22:46, schrieb= Riccardo Zoli:
> Hi Stefan, VLF
> 
<= div>> I got your signal in JN64bw, dear Stefan. Depending on the QSB a= nd/or
> QRN, you're peaking 15dB over noise. Fantastic! :-))=
> I'm using my LF antenna tuned on your QRG with a (approx.= ) 200mH coil.
> The 17470.5 signal (locally generated by a G= PS disciplined DDS) is
> used for Spectrum Lab SR correction= .
> Schematic and capture attached.
> 
> 
> Congrats, Stefan, and keep up the good w= ork!
> 
> All the best,
>&nbs= p;
> 73 de Riccardo IW4DXW
> 
&g= t; 
> 
> 2017-11-26 0:40 GMT+01:00 DK= 7FC<selberdenken@posteo.de>:
>
>> = Hi VLF,
>> 
>> Since 23 UTC a 700 mA= carrier is running on 17.4701 kHz!
>> 
&g= t;> It is a little surprise to the VLF community i think ;-)
>> 
>> Legal? Yes:
>> http://= www.iup.uni-heidelberg.de/schaefer_vlf/VLF/17,47kHz_Sonderlizenz.jpg
>> Actually the document has 3 pages but the other ones are n= o so relevant.
>> My ERP is limited to 5 mW. I did not re= quest more because more isn't
>> possible anyway with thi= s antenna.
>> 
>> I wound a big sing= le layer coil with 0.5 mm enameled wire on a PVC tube with
>= > 315 mm outher diameter.
>> 
>> = 0.7 A is just a first careful step. The coil is designed to hold 1.5 A 'k= ey
>> down'.
>> 
>> = The carrier will run the whole night and even tomorrow at daytime.
<= div>>> 
>> Worldwide reports are welcome ;-)
>> 
>> It is not sub-9-kHz but still = VLF, the 17 km band!! So give it chance :-)
>> 
>> The tree has still some solar power to stream the signal f= rom the EW loop
>> down to the city, so there is a feedba= ck spectrogram at
>> http://www.iup.uni-heidelberg.de/sch= aefer_vlf/DK7FC_VLF_Grabber2.html
>> 
>= > 
>> 73, Stefan
>> 
>> PS: I still can hear that tone of the coil. It is terrible! B= e happy when
>> you are older than me!
>>=
--_=__=_XaM3_.1512071356.2A.644334.42.1364.52.42.007.819783570--