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 v7L3LOrY010101 for ; Mon, 21 Aug 2017 05:21:25 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1djdDe-0007IY-Eo for rs_out_1@blacksheep.org; Mon, 21 Aug 2017 04:17:38 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1djdDd-0007IP-Sv for rsgb_lf_group@blacksheep.org; Mon, 21 Aug 2017 04:17:37 +0100 Received: from resqmta-ch2-03v.sys.comcast.net ([2001:558:fe21:29:69:252:207:35]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1djdDZ-0008Ol-G4 for rsgb_lf_group@blacksheep.org; Mon, 21 Aug 2017 04:17:36 +0100 Received: from resomta-ch2-16v.sys.comcast.net ([69.252.207.112]) by resqmta-ch2-03v.sys.comcast.net with ESMTP id jdDKdFPzM9W8vjdDVdlVFS; Mon, 21 Aug 2017 03:17:29 +0000 X-DKIM-Result: Domain=comcast.net Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20161114; t=1503285449; bh=fWtrINjTPuRZePfYYx6Z0nATwO78kQXsH9o+DogyFKU=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=b9pOcD99qT/uLdwSRG9fcrmPrGEQyNdAon/KjsReFaGiSPwKh5bI+KibLZa6SC9uK 2KgvVH07+nK2FZbISUIRLKLJYRvsIOZh+uEAA6Tvwkt8Pe0pc93Nt1Zgdjw06IDKAD btxJaIhKgf3exFNzmiCCegEXspHFK5QAsEXAknm2/oeQvkMjwB1mTk82D+ebK8ufvD IyE5TSsHF1ljpt8B8E8QWdL2gGxkXrrLwXj3RD9FpiMF5AHqZio76jXhcLu6KB1QPL xMQG6atoxcEat7W9HStr9H1zaSp38ODCvTyWb1+ciUzjiD3kdKyjEtsJtyDR7wqKh8 GgWSTnjQmg8nQ== Received: from Owner ([IPv6:2601:140:8500:7f9f:380d:2340:1a77:91a4]) by resomta-ch2-16v.sys.comcast.net with SMTP id jdDUdCo3FeaimjdDVd97Wa; Mon, 21 Aug 2017 03:17:29 +0000 From: To: References: <15dffdcf848-c0a-3698@webjas-vab031.srv.aolmail.net> <15e01234288-c03-3f1c@webjas-vaa133.srv.aolmail.net> In-Reply-To: <15e01234288-c03-3f1c@webjas-vaa133.srv.aolmail.net> Date: Sun, 20 Aug 2017 23:17:24 -0400 Message-ID: <069001d31a2c$03420d60$09c62820$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQI2KWBKtaqQkOLMRnB7A61Kc+lg76HIAk7w Content-Language: en-us X-CMAE-Envelope: MS4wfFSFAlqKPrfgKXafnQpEvWFp92k3+t5mjeR52I6igis/1Kvw/YGTDHpRP5WVbkOtLcKvRj+RbFLYnieHWqxmja1n3+sq7bC3ZyGldlt+MK5Yin3zHPDl E3ICrr2nVIJ0YQVrVWmvWzL8c7/5f9ZLvgs= X-Scan-Signature: 1b85b97af56c2ce8b6be9bd6ca70127d Subject: RE: VLF: Carrier on 4470.005 Hz! - fieldstrength comparison Content-Type: multipart/alternative; boundary="----=_NextPart_000_0691_01D31A0A.7C321B10" 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: 12418 This is a multipart message in MIME format. ------=_NextPart_000_0691_01D31A0A.7C321B10 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Nice work! =20 73, =20 Jim AA5BW =20 From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus Vester Sent: Sunday, August 20, 2017 3:34 PM To: rsgb_lf_group@blacksheep.org Subject: Re: VLF: Carrier on 4470.005 Hz! - fieldstrength comparison =20 This test is going surprisingly well. producing beautiful 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 similar today, but = I guess the 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 reference 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 uHz:=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 since 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 = 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.=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 = tree grabber: = http://www.iup.uni-heidelberg.de/schaefer_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! ------=_NextPart_000_0691_01D31A0A.7C321B10 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Nice work!

 

73,

 

Jim AA5BW

 

From:= = owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus = Vester
Sent: Sunday, August 20, 2017 3:34 PM
To: = rsgb_lf_group@blacksheep.org
Subject: Re: VLF: Carrier on = 4470.005 Hz! - fieldstrength comparison

 

T= his test is going surprisingly well. producing beautiful 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 similar = today, but I guess the 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 reference = 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 <markusvester@aol.com>
An: = rsgb_lf_group <rsgb_lf_group@blacksheep.org= >
Verschickt: So, 20. Aug 2017 15:37
Betreff: Re: VLF: = Carrier on 4470.005 Hz!

<= p class=3DMsoNormal style=3D'margin-bottom:12.0pt'>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.  

Best = 73,
Markus


-----Urspr=C3=BCngliche Mitteilung----- =
Von: Markus Vester <markusvester@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!

H= i Stefan,

this morning, an unambiguous peak has come up = on the DL0AO cardioid in 31 uHz: 
http://df6nm.bplaced.net/dl0ao/VLFgrabber/vlfgrabber_dl= 0ao_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 since 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)   


-----Urspr=C3=BCngliche = Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group = <rsgb_lf_group@blacksheep.org>
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: =

H= ello 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/schaefer_vlf/DK7FC_VLF= _Grabber2.html

73, Stefan

Am 13.08.2017 22:17, schrieb = DK7FC:

T= he 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!

------=_NextPart_000_0691_01D31A0A.7C321B10--