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=3 Fuz1=3 Fuz2=3 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 v7JD4Vi2005216 for ; Sat, 19 Aug 2017 15:04:32 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dj3Lz-0002jk-Ph for rs_out_1@blacksheep.org; Sat, 19 Aug 2017 13:59:51 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dj3LM-0002jZ-Ix for rsgb_lf_group@blacksheep.org; Sat, 19 Aug 2017 13:59:12 +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 1dj3LE-00035p-Te for rsgb_lf_group@blacksheep.org; Sat, 19 Aug 2017 13:59:08 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 4C5EC209E4 for ; Sat, 19 Aug 2017 14:59:04 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3xZKlW5ZmPz10HR for ; Sat, 19 Aug 2017 14:59:03 +0200 (CEST) Message-ID: <59983617.5090506@posteo.de> Date: Sat, 19 Aug 2017 14:59:03 +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> <59982EF7.5030704@posteo.de> In-Reply-To: <59982EF7.5030704@posteo.de> X-Scan-Signature: 21e2055b299bd63ed331c37c8a3e15ca Subject: Re: VLF: Carrier on 4470.005 Hz! Content-Type: multipart/alternative; boundary="------------020805050001000005080100" 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: 12402 This is a multi-part message in MIME format. --------------020805050001000005080100 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit ...Rather 5 uW. Am 19.08.2017 14:28, schrieb DK7FC: > 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! --------------020805050001000005080100 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit ...Rather 5 uW.

Am 19.08.2017 14:28, schrieb DK7FC:
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!
--------------020805050001000005080100--