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+deb8u1) with ESMTP id v041UM98025920 for ; Wed, 4 Jan 2017 02:30:23 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cOaLB-000733-62 for rs_out_1@blacksheep.org; Wed, 04 Jan 2017 01:26:09 +0000 Received: from [195.171.43.34] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cOaLA-00072u-Sp for rsgb_lf_group@blacksheep.org; Wed, 04 Jan 2017 01:26:08 +0000 Received: from mout02.posteo.de ([185.67.36.66]) by relay2.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1cOaL8-0005nB-7k for rsgb_lf_group@blacksheep.org; Wed, 04 Jan 2017 01:26:07 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 5D4CF20C63 for ; Wed, 4 Jan 2017 02:26:05 +0100 (CET) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3ttY6h6p65zytm for ; Wed, 4 Jan 2017 02:26:04 +0100 (CET) Message-ID: <586C4F2C.1010205@posteo.de> Date: Wed, 04 Jan 2017 02:26:04 +0100 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: <159526aa32e-1297-2d056@webprd-m96.mail.aol.com> <5867AA75.6030603@posteo.de> <5867DFA9.5020604@abelian.org> <58691D84.9030201@posteo.de> <586A8A05.5090901@posteo.de> <586AA7C5.8070802@abelian.org> <049501d26535$dee8b370$9cba1a50$@comcast.net> <586B5BAD.7@abelian.org> In-Reply-To: <586B5BAD.7@abelian.org> X-Scan-Signature: fb3e28a759dea7e01d34d3fe7de7ae98 Subject: Re: VLF: Back on 5.17 kHz / 58 km... Content-Type: multipart/alternative; boundary="------------020500040504020509090202" 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: A X-Keywords: X-UID: 10100 This is a multi-part message in MIME format. --------------020500040504020509090202 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit VLF, Today i spent several hours just for moving the resonance frequency from 5.10 to 5.17 kHz. It shounds like an easy job but although i put more iron powder cores into the coil, which rises the spacing between the cups, which lowers the L, so it overcompensates the additional cores, and it rises the Q, the resonance frequency rose to 5.4 kHz and i didn't get it back. So i had to bring the whole arrangement down to the lab. Later i managed to bring it accurately on 5.17 kHz and now i'm back with 225 mA antenna current. I built an ALC into the conditional actions of SpecLab which hold to the antenna current into a range between 224 and 226 mA. It seems to work so far. Of course the tuning range is limited. We will see if the current stays stable, at least during dry wx... So now it's time for a new transmission: *f = 5170.000000 Hz Start time: 04.Jan.2017 08:00:00 UTC Symbol length: 60 s Characters: 8 CRC 16 Coding 16K25A Duration: 12h, 26m, 40s Antenna current: ~ 225 mA* 73, Stefan --------------020500040504020509090202 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit VLF,

Today i spent several hours just for moving the resonance frequency from 5.10 to 5.17 kHz. It shounds like an easy job but although i put more iron powder cores into the coil, which rises the spacing between the cups, which lowers the L, so it overcompensates the additional cores, and it rises the Q, the resonance frequency rose to 5.4 kHz and i didn't get it back. So i had to bring the whole arrangement down to the lab. Later i managed to bring it accurately on 5.17 kHz and now i'm back with 225 mA antenna current.

I built an ALC into the conditional actions of SpecLab which hold to the antenna current into a range between 224 and 226 mA. It seems to work so far. Of course the tuning range is limited. We will see if the current stays stable, at least during dry wx...

So now it's time for a new transmission:

f = 5170.000000 Hz
Start time: 04.Jan.2017 08:00:00 UTC
Symbol length: 60 s
Characters: 8
CRC 16
Coding 16K25A
Duration: 12h, 26m, 40s
Antenna current: ~ 225 mA

73, Stefan
--------------020500040504020509090202--