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=HEADER_FROM_DIFFERENT_DOMAINS, HTML_MESSAGE,SPF_PASS,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 v7JCWXCd005105 for ; Sat, 19 Aug 2017 14:32:34 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dj2rx-0002cj-2D for rs_out_1@blacksheep.org; Sat, 19 Aug 2017 13:28:49 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dj2rw-0002ca-NA for rsgb_lf_group@blacksheep.org; Sat, 19 Aug 2017 13:28:48 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dj2rs-00030u-OL for rsgb_lf_group@blacksheep.org; Sat, 19 Aug 2017 13:28:47 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 7D37420A29 for ; Sat, 19 Aug 2017 14:28:42 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3xZK4T52B8zyRn for ; Sat, 19 Aug 2017 14:28:41 +0200 (CEST) Message-ID: <59982EF7.5030704@posteo.de> Date: Sat, 19 Aug 2017 14:28:39 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <15dd846ba8e-2e05-13131@webprd-a53.mail.aol.com> <5990112D.3030503@posteo.de> <023301d31444$cdeba320$69c2e960$@comcast.net> <5990B3F3.9060502@posteo.de> In-Reply-To: <5990B3F3.9060502@posteo.de> X-Scan-Signature: cd16d8c2fb75309db133b7de4adb1391 Subject: VLF: Carrier on 4470.005 Hz! Content-Type: multipart/alternative; boundary="------------050300000708050304070901" 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: 12401 This is a multi-part message in MIME format. --------------050300000708050304070901 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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/schaefer_vlf/DK7FC_VLF_Grabber2.html 73, Stefan Am 13.08.2017 22:17, schrieb DK7FC: > 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! --------------050300000708050304070901 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit 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/schaefer_vlf/DK7FC_VLF_Grabber2.html

73, Stefan

Am 13.08.2017 22:17, schrieb DK7FC:
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!
--------------050300000708050304070901--