Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,SPF_PASS, T_DKIM_INVALID,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: wuwien: mailn 1290; 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+deb8u2) with ESMTP id v7KJc2UT009579 for ; Sun, 20 Aug 2017 21:38:04 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1djVz9-0006Oa-EN for rs_out_1@blacksheep.org; Sun, 20 Aug 2017 20:34:11 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1djVz9-0006OR-22 for rsgb_lf_group@blacksheep.org; Sun, 20 Aug 2017 20:34:11 +0100 Received: from omr-m014e.mx.aol.com ([204.29.186.13]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1djVz3-0007UE-8x for rsgb_lf_group@blacksheep.org; Sun, 20 Aug 2017 20:34:09 +0100 Received: from mtaomg-aan02.mx.aol.com (mtaomg-aan02.mx.aol.com [172.27.19.80]) by omr-m014e.mx.aol.com (Outbound Mail Relay) with ESMTP id 67E1C380009F for ; Sun, 20 Aug 2017 15:34:03 -0400 (EDT) Received: from core-acb02c.mail.aol.com (core-acb02.mail.aol.com [172.27.24.2]) by mtaomg-aan02.mx.aol.com (OMAG/Core Interface) with ESMTP id E68E638000081 for ; Sun, 20 Aug 2017 15:34:02 -0400 (EDT) Received: from 188.192.44.165 by webjas-vaa133.srv.aolmail.net (10.96.33.136) with HTTP (WebMailUI); Sun, 20 Aug 2017 15:34:01 -0400 Date: Sun, 20 Aug 2017 15:34:02 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <15e01234288-c03-3f1c@webjas-vaa133.srv.aolmail.net> In-Reply-To: <15dffdcf848-c0a-3698@webjas-vab031.srv.aolmail.net> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.192.44.165] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1503257643; bh=xMr8R4B4lmFBGnax3jwYcPEEQhLgrrIHhH1zxNQbmPA=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=ttxLFVSpUbtWbY2xceXxago543ZI0O1zTUrIG5D54b/Hd7lnxg1mJSjlWxTzeYJfY iDJmn71wKiCGbGI9HrIW27foYoGGON+vYOv26GcuhNVVzDBaWWetHqfDq6CEhH/6vW qxiOGxe8FF77mbx1hF1+BCTl3xZYGCPZRHPG8oTc= x-aol-sid: 3039ac1b13505999e42a7191 X-Scan-Signature: 0c28add2673aaa1c8f62f1695e18ff8b Subject: Re: VLF: Carrier on 4470.005 Hz! - fieldstrength comparison Content-Type: multipart/alternative; boundary="----=_Part_20332_305034395.1503257641608" 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: 12413 ------=_Part_20332_305034395.1503257641608 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable This test is going surprisingly well. producing beautiful twin peaks on 447= 0.005 and 4470.0025 on the DL0AO grabber. It looks like my signal is about = 10 dB stronger there. Our antenna currents are similar today, but I guess t= he effective height and ERP are 5 to 6 dB higher at DK7FC. Thus propagation= between Heidelberg and Amberg would be 13.5 - 5.5 -10 =3D -2 dB with refer= ence to groundwave alone. This is somewhat surprising, given that a similar= (but probably less reliable) calculation for 3675 Hz had indicated a +5.5 = dB ionospheric gain. All the best, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-- Von: Markus Vester An: rsgb_lf_group Verschickt: So, 20. Aug 2017 15:37 Betreff: Re: VLF: Carrier on 4470.005 Hz! I have managed to resonate my antenna and started a carrier on 4470.0025 Hz= since 13:07 UT. Antenna current is 0.16 A into 8 m effective height. Hope = that it might also become visible on DL0AO, and perhaps provide an improved= calibration reference for propagation from Heidelberg. =20 Best 73, Markus -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Markus Vester An: rsgb_lf_group Verschickt: So, 20. Aug 2017 11:11 Betreff: Re: VLF: Carrier on 4470.005 Hz! Hi Stefan, this morning, an unambiguous peak has come up on the DL0AO cardioid in 31 u= Hz:=20 http://df6nm.bplaced.net/dl0ao/VLFgrabber/vlfgrabber_dl0ao_test.htm The signal level (-140 dB) seems to be similar to that previously observed = on 3675 Hz (noting that the gain of the synthetic cardioid summation has si= nce been reduced by 6 dB to make it equal to the single antennas). We can = probably hope for improved SNR during the day. Well done again! Best 73, Markus (DF6NM) =20 -----Urspr=C3=BCngliche Mitteilung-----=20 Von: DK7FC An: rsgb_lf_group Verschickt: Sa, 19. Aug 2017 15:01 Betreff: Re: VLF: Carrier on 4470.005 Hz! ...Rather 5 uW. Am 19.08.2017 14:28, schrieb DK7FC:=20 Hello VLF,=20 I un-wound the defective stack of the large coil which was used for 2970 H= z. It took about 4 hours to carefully unwound about 1000 turns, or about 1 = km of wire. The wire will be used for new coils which are already planned. Now, the remaining 4 stacks should hold at least 15 kV. I connected the co= il to the antenna and found the resonance close to 4470 Hz.=20 Now i'm running (since 12 UTC) a carrier transmission on 4470.005 Hz. The = antenna current is just 150 mA. That's an ERP of about 3 uW. A first signal= on the 67 km band from here :-) Let's see how long it holds until there is the next fault :-/ Reports/Spectrograms welcome... As usual there is a monitoring of the signal in 3.5 km distance from my tr= ee grabber: http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber= 2.html 73, Stefan Am 13.08.2017 22:17, schrieb DK7FC:=20 The repetition of yesterdays message failed. At 15:38 UTC the safety functi= on tripped. I've just been on the roof, when re-starting the transmission i= can see a spark in the center of one of the stacks. So now there is anothe= r one which has a flash over! :-( It must be replaced, which is a lot of work. So the tranmissions on 3675 H= z will stopp for some time. At least we have some carrier detections and ev= en EbNaut decodes. I need to think about a different coil concept.... More current, more volt= age, more power, more more more! ------=_Part_20332_305034395.1503257641608 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
This test is going surprisingly well. producing beautifu= l twin peaks on 4470.005 and 4470.0025 on the DL0AO grabber. It looks like = my signal is about 10 dB stronger there. Our antenna currents are simi= lar today, but I guess the effective height and ERP are 5 to 6 dB high= er at DK7FC. Thus propagation between Heidelberg and Amberg would= be 13.5 - 5.5 -10 =3D -2 dB with reference to groundwave al= one. This is somewhat surprising, given that a similar (but probably less r= eliable) calculation for 3675 Hz had indicated a +5.5 dB ionospheric gain.<= br>
All the best,
Markus (DF6NM)


-----Urspr=C3=BCngliche M= itteilung--
Von: Markus Vester <markusvester@aol.com>
An: rsgb_= lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: So, 20. Aug 20= 17 15:37
Betreff: Re: VLF: Carrier on 4470.005 Hz!

I have managed to re= sonate my antenna and started a carrier on 4470.0025 Hz sinc= e 13:07 UT. Antenna current is 0.16 A into 8 m effective height. Hope = that it might also become visible on DL0AO, and perhaps provide an imp= roved calibration reference for propagation from Heidelberg. &nbs= p;

Best 73,
Markus


-----Urspr=C3=BCngliche Mitteilung-= ----
Von: Markus Vester <mar= kusvester@aol.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt:= So, 20. Aug 2017 11:11
Betreff: Re: VLF: Carrier on 4470.005 Hz!
...Rather 5 uW.

Am 19.08.2017 14:28, schrieb DK7FC:
=20 Hello VLF,

I un-wound the defective stack of the large coil which was used for 2970 Hz. It took about 4 hours to carefully unwound about 1000 turns, or about 1 km of wire. The wire will be used for new coils which are already planned.

Now, the remaining 4 stacks should hold at least 15 kV. I connected the coil to the antenna and found the resonance close to 4470 Hz.
Now i'm running (since 12 UTC) a carrier transmission on 4470.005 Hz= . The antenna current is just 150 mA. That's an ERP of about 3 uW. A first signal on the 67 km band from here :-)
Let's see how long it holds until there is the next fault :-/

Reports/Spectrograms welcome...

As usual there is a monitoring of the signal in 3.5 km distance from my tree grabber: http://www.iup.uni-heidelberg.de/schaef= er_vlf/DK7FC_VLF_Grabber2.html

73, Stefan

Am 13.08.2017 22:17, schrieb DK7FC:
=20 The repetition of yesterdays message failed. At 15:38 UTC the safety function tripped. I've just been on the roof, when re-starting the transmission i can see a spark in the center of one of the stacks. So now there is another one which has a flash over! :-(
It must be replaced, which is a lot of work. So the tranmissions on 3675 Hz will stopp for some time. At least we have some carrier detections and even EbNaut decodes.

I need to think about a different coil concept.... More current, more voltage, more power, more more more!
------=_Part_20332_305034395.1503257641608--