Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, HTML_MESSAGE,RCVD_IN_DNSWL_MED,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; 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 v6SF7skV000813 for ; Fri, 28 Jul 2017 17:07:55 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1db6gy-000618-0k for rs_out_1@blacksheep.org; Fri, 28 Jul 2017 15:56:40 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1db6gx-00060z-0j for rsgb_lf_group@blacksheep.org; Fri, 28 Jul 2017 15:56:39 +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 1db6gt-0002bO-7T for rsgb_lf_group@blacksheep.org; Fri, 28 Jul 2017 15:56:37 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 092EC20B57 for ; Fri, 28 Jul 2017 16:56:31 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3xJsPC2vcXz10Hs; Fri, 28 Jul 2017 16:56:31 +0200 (CEST) Message-ID: <597B509E.8080105@posteo.de> Date: Fri, 28 Jul 2017 16:56:30 +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, Renato Romero References: <597AC385.8070108@rtv5.cz> <15d88d4c847-7d6d-2b953@webprd-m86.mail.aol.com> In-Reply-To: <15d88d4c847-7d6d-2b953@webprd-m86.mail.aol.com> X-Scan-Signature: cd16d8c2fb75309db133b7de4adb1391 Subject: VLF: Carrier on 3675.005 Hz Content-Type: multipart/alternative; boundary="------------000702020402060003000607" 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: 12312 This is a multi-part message in MIME format. --------------000702020402060003000607 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi VLF, I'm back from LF for a while and built up my large VLF coil which was used on 2970 Hz in the beginning of the year. Actually it is under maintenance, one of the six stacks has to be replaced. It is already dismantled but the new wire is not yet wound on the 250 mm diameter PVC tube again. So now the resonance is higher! I didn't know where it is and just connected the coil and scanned the frequency downwards. Near 3685 Hz i found a maximum of the antenna. Since the Q is not extremely high, i decided to tune to 3675 Hz and added the usual 5 mHz offset, to stay away from multiples of 1 Hz. So, now *since 14:40 UTC* a carrier is running on *3675.005 Hz*. The antenna current is *170 mA*. I estimate the *ERP is just 3 uW*! I guess this is a first amateur radio transmission on the *82 km* band and that class of ERP (?). Hopefully the coil will hold the *15.5 kV* with just 5 stacks of windings. It's inductance is *3.9 H* in the moment! I intend to run the carrier for at least a few days, depending on the feedback. Good luck for the VLF experts! 73, Stefan PS: A 424 uHz RDF spectrogram is running at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html (First pixel appears in 30 minutes) --------------000702020402060003000607 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi VLF,

I'm back from LF for a while and built up my large VLF coil which was used on 2970 Hz in the beginning of the year. Actually it is under maintenance, one of the six stacks has to be replaced. It is already dismantled but the new wire is not yet wound on the 250 mm diameter PVC tube again.
So now the resonance is higher! I didn't know where it is and just connected the coil and scanned the frequency downwards. Near 3685 Hz i found a maximum of the antenna. Since the Q is not extremely high, i decided to tune to 3675 Hz and added the usual 5 mHz offset, to stay away from multiples of 1 Hz.

So, now since 14:40 UTC a carrier is running on 3675.005 Hz. The antenna current is 170 mA. I estimate the ERP is just 3 uW!

I guess this is a first amateur radio transmission on the 82 km band and that class of ERP (?).

Hopefully the coil will hold the 15.5 kV with just 5 stacks of windings. It's inductance is 3.9 H in the moment!

I intend to run the carrier for at least a few days, depending on the feedback.

Good luck for the VLF experts!

73, Stefan

PS: A 424 uHz RDF spectrogram is running at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html (First pixel appears in 30 minutes)

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