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: : mailn 1480; 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 v3ICaKli005449 for ; Tue, 18 Apr 2017 14:36:22 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1d0SJj-0003sj-Eq for rs_out_1@blacksheep.org; Tue, 18 Apr 2017 13:33:11 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1d0SJj-0003sa-33 for rsgb_lf_group@blacksheep.org; Tue, 18 Apr 2017 13:33:11 +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 1d0SJf-0005Qk-RU for rsgb_lf_group@blacksheep.org; Tue, 18 Apr 2017 13:33:09 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 29B6120FD2 for ; Tue, 18 Apr 2017 14:33:07 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3w6l0L4M8Vz109D for ; Tue, 18 Apr 2017 14:33:06 +0200 (CEST) Message-ID: <58F60782.8050109@posteo.de> Date: Tue, 18 Apr 2017 14:33:06 +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: , <58F48E7E.17668.80FC91@roelof.ndb.demon.nl>, <9E7678AF78C14D20B28472DF6749967A@AGB> <58F523AB.16927.6F358B@roelof.ndb.demon.nl> <58F52756.9090301@posteo.de> <58F527AB.3070304@posteo.de> In-Reply-To: <58F527AB.3070304@posteo.de> X-Scan-Signature: eeb98d9e5f7535b37e24952fd7f85252 Subject: Re: VLF: New carrier on 6470.005 Hz Content-Type: multipart/alternative; boundary="------------040300050002050407000003" 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: 11369 This is a multi-part message in MIME format. --------------040300050002050407000003 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit There was an interruption of the carrier between 5:28...5:48 UTC. This was again by reaching the -20 mA safety limit. It was just due to rain which pulled the resonance to much downwards, despite the phase meter driven transductor which can compensate a drift of up to about 25 Hz in this frequency range. A few more interruptions and phase reversals are shown on the tree grabber but these were only on the RX side, a restart of the Raspi was done after 2 months of errorless operation. A second attempt of the longer message: *f = 6470.100000 Hz Start time: 19.Apr.2017 07:00:00 UTC Symbol period: 4 s Characters: 30 CRC bits: 10 Coding 16K25A Duration: 3h, 48m, 16s Antenna current: 460 mA * 73, Stefan Am 17.04.2017 22:38, schrieb DK7FC: > PS: Carrier on air since 20:05 UTC. > 73 > > Am 17.04.2017 22:36, schrieb DK7FC: >> VLF, >> >> Now the coil resonance is right on 6470 Hz. A + 5 Hz or a - 5 Hz step >> is leading to a lower antenna current. The carrier will stay on air >> for at least 1 day, that's the plan. An EbNaut message will follow, >> if all works well. >> I'm still staying at 460 mA antenna current. The actual frequency is >> 6470.005000 Hz. >> With the 6.2 dB stronger signal relative to my last experiments a few >> months ago, Paul may get a more precise measurement of the diurnal >> phase changes... >> Hopefully there will be a trace at RN3AUS but maybe this is not >> realistic? >> >> 73, Stefan > --------------040300050002050407000003 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit There was an interruption of the carrier between 5:28...5:48 UTC. This was again by reaching the -20 mA safety limit. It was just due to rain which pulled the resonance to much downwards, despite the phase meter driven transductor which can compensate a drift of up to about 25 Hz in this frequency range.
A few more interruptions and phase reversals are shown on the tree grabber but these were only on the RX side, a restart of the Raspi was done after 2 months of errorless operation.

A second attempt of the longer message:

f = 6470.100000 Hz
Start time: 19.Apr.2017   07:00:00 UTC
Symbol period: 4 s
Characters: 30
CRC bits: 10
Coding 16K25A
Duration: 3h, 48m, 16s
Antenna current: 460 mA


 73, Stefan




Am 17.04.2017 22:38, schrieb DK7FC:
PS: Carrier on air since 20:05 UTC.
73

Am 17.04.2017 22:36, schrieb DK7FC:
VLF,

Now the coil resonance is right on 6470 Hz. A + 5 Hz or a - 5 Hz step is leading to a lower antenna current. The carrier will stay on air for at least 1 day, that's the plan. An EbNaut message will follow, if all works well.
I'm still staying at 460 mA antenna current. The actual frequency is 6470.005000 Hz.
With the 6.2 dB stronger signal relative to my last experiments a few months ago, Paul may get a more precise measurement of the diurnal phase changes...
Hopefully there will be a trace at RN3AUS but maybe this is not realistic?

73, Stefan

--------------040300050002050407000003--